$7900

Category: Chemicals/Chemical Lab Equipment/Chemical Laboratory Equipment

Company: Hebei Jianyi Instrument Equipment Co., Ltd.

Product Description:        I. Complete Set of New Laboratory EquipmentMain Purpose    This testing machine is used to determine the compressive strength of building materials such as bricks, stones, and concrete.This machine features electric hydraulic loading, sensor force measurement, digital display of force values, a printer for recording force data, and conversion to compressive strength. It complies with the standard "Standard for Test Method of Mechanical Properties of Ordinary Concrete," requires manual control of loading speed, and is equipped with a loading speed indicator, peak hold function, and overload protection. It is an essential testing and inspection device for construction, building materials, highway and bridge engineering units.       II. Complete Set of New Laboratory EquipmentMain Technical Parameters1.      Load:                  2000 kN2. Accuracy of Indication:              Class 13.         Resolution:             0.1 kN4. Distance Between       Compression Plates:  320 mm5. Upper and Lower Pressure Plate Specifications:    220×250 mm6. Piston Diameter*   Stroke: Diameter 250×40 mm7. Motor Power:             0.75 kW8. Input Voltage:               380 V9. Overall Dimensions:         880×480×1400 mm10. Net Weight:                 600 kg      III. Complete Set of New Laboratory EquipmentStructural OverviewThe testing machine mainly consists of three parts: the body, the hydraulic control box, and the force measurement instrument.1. Body SectionThe body of the testing machine is formed by four columns connecting the cylinder body and the upper beam.On the upper beam of the testing machine, an adjustment screw, a large handwheel, and a nut screw are installed to adjust the no-load height of the machine. The lower end of the screw is equipped with a spherical seat and an upper pressure plate. The lower pressure plate is placed on the piston of the oil cylinder. When the specimen contacts the upper pressure plate, the spherical seat of the upper pressure plate can self-adjust for balance, ensuring the specimen remains level with the upper and lower pressure plates. The lower pressure plate is engraved with alignment lines for the specimen. During testing, the specimen must be aligned with these lines. A dust cover is installed below the lower pressure plate to prevent or reduce dust from entering the oil cylinder during piston movement, which could damage the cylinder or oil seal. A sealing device is installed between the piston and the oil cylinder to prevent oil leakage. However, if a minimal amount of oil leaks during use, an annular oil groove at the top of the cylinder and an oil discharge channel will direct the oil back to the main tank.2. Hydraulic Section     The hydraulic box of this testing machine mainly consists of an oil tank, oil pump, oil filter, motor, speed valve, and return oil valve. The oil pump is a direct-drive axial five-piston pump. During loading, the loading speed should be manually controlled using the speed valve to regulate the piston’s upward movement (the speed valve and safety valve are integrated). During unloading, the return oil valve can be turned to allow the oil cylinder to descend slowly. The safety valve is preset to an appropriate position before leaving the factory. Under normal use, users should not adjust the safety valve. more>

Negotiable

Category: Chemicals/Chemical Intermediates/Intermediate Compounds

Company: Zhuhai Hongfu Technology Co., Ltd.

Product Description: more>

$1500

Category: Others

Company: Qingdao Hongxinhui Integrated Housing Development Co., Ltd.

Product Description: Design and construction of light steel structure staff dormitory buildings, light steel structure management housesLight steel structure houses are structurally stable, wind and earthquake resistant, making them safe and reliable buildings. With housing prices being too high now, they can be used to solve residential problems. In fact, although light steel structure house materials are lightweight, their biggest advantage is their excellent structural performance, so their seismic performance undoubtedly surpasses that of red brick houses by several streets!Are light steel houses sturdy and durable? This question should be considered from two aspects. In principle, when constructed according to specifications, light steel houses exceed traditional brick-concrete structures in terms of both seismic resistance and safety. Moreover, according to the design guidelines from the Steel Association, light steel materials can last for hundreds or even thousands of years without any issues. Steel structure houses use steel as the main building material, with high load-bearing capacity per unit volume, making them more stable and robust than traditional brick-wood and brick-concrete techniques. They offer superior seismic and wind resistance performance, especially in terms of earthquake resistance.The advantages of steel include high strength, light weight, good overall rigidity, and strong deformation capacity. The material has high plasticity and toughness, allowing it to withstand dynamic loads effectively. The construction period is short, and the industrialization level is high, enabling mechanized and standardized production. Steel has excellent ductility, which helps to dissipate the energy generated by earthquakes, resulting in good seismic performance and high structural safety, ensuring the security of residential buildings. It also meets the requirements for waterproofing, fire resistance, as well as providing good thermal insulation and soundproofing functions.Light steel houses can be widely used in civil and public buildings, such as: new rural construction, villas, schools, apartments, resettlement housing, vacation homes, camp houses, kindergartens, office buildings, hotels, inns, camp houses, etc. more>

$95

Category: Chemicals/Chemical Intermediates/Intermediate Compounds

Company: Hengshui Changjiang Prestressing Co., Ltd.

Product Description: Highway Anchor M15-9 Anchor Price Hunan Anchor Direct SalesWidely used in highway bridges, railway bridges, urban overpasses, urban light rail, high-rise buildings, hydraulic and hydroelectric dams, ports and docks, rock slope anchoring, foundation reinforcement, tunnel and mine roof anchoring, prestressed space frames, subways, large public buildings, warehouses and factories, tower structures, heavy lifting, incremental sliding formwork advancement, bridge and tunnel jacking, large containers and ships, railway sleepers, bridge bearing replacement, bridge and building reinforcement, rebar engineering, anti-magnetic and anti-corrosion engineering (fiber anchors), carbon fiber reinforcement, pretensioned beam yard construction, external prestressing engineering, cable-stayed cables, suspension cables, and other engineering projects.Specifications and ModelsCurrently, the commonly used anchor specifications in China include:(a) M15-N anchor. M stands for anchor (the first letter of the Chinese pinyin for anchor); Highway Anchor M15-9 Anchor Price Hunan Anchor Direct Sales15 represents the specification of the steel strand, which is 15.24 (the commonly used steel strand strength in China is 1860MPa grade 15.24 steel strand); -N refers to the number of steel strands to be threaded.(b) M13-N anchor. M stands for anchor (the first letter of the Chinese pinyin for anchor); 13 represents the specification of the steel strand, which is 12.78 (the commonly used steel strand strength abroad is 1860MPa grade 13.78 steel strand); -N refers to the number of steel strands to be threaded.Main ClassificationsCommon system classifications of anchors:(1) Cylindrical conventional anchors. The specifications are represented as: Highway Anchor M15-9 Anchor Price Hunan Anchor Direct SalesM15-N or M13-N; these anchors have good anchoring performance and self-anchoring release characteristics. Tensioning generally uses through-type jacks;(2) Rectangular flat anchors. The specifications are represented as: BM15-N or BM13-N (B, the first letter of the Chinese pinyin for flat anchor, represents flat anchor); flat anchors are mainly used for transverse prestressing of bridge decks, hollow slabs, and low-height box girders, making stress distribution more uniform and reasonable, further reducing structural thickness.(3) Grip-type anchors. (Fixed-end anchors) Highway Anchor M15-9 Anchor Price Hunan Anchor Direct SalesThe specifications are represented as: M15P-N or M13P-N; suitable for situations where the design stress at the component end is large or the end space is limited. It is a grip-type anchor that uses a squeezing machine to press the squeezing sleeve onto the steel strand. It is embedded in concrete, arranged as needed, and after the concrete has cured to the design strength, tensioning is performed. more>

Negotiable

Category: Chemicals/Chemical Intermediates/Intermediate Compounds

Company: Meishan Baicaotianxia Chinese Herbal Medicine Co., Ltd.

Product Description: Although the per-mu yield of cultivated Polygonatum is not high and the planting process is cumbersome, with the reduction of wild resources and continuously rising prices, cultivation will continue to develop. However, as long as wild resources remain relatively abundant, the pace of cultivation development will not be too rapid. In previous years, a small amount of cultivated Polygonatum has already entered the market as new stock, but the quantity is too limited to obtain specific statistics. This year, the scope of cultivation is considerable, but unfortunately, Polygonatum has a long growth cycle. Before this batch of cultivated supplies becomes widely available on the market, there will still be a need for wild resources to meet market demand, as supply falls short of demand. The author believes that, under the current supply-demand矛盾 (contradiction), Polygonatum still has considerable potential for future market growth.  more>

Negotiable

Category: Metallurgy & Minerals/Non-Metallic Mineral Products/Refractory & Fireproof Materials

Company: Hubei Xinglong High-Temperature Energy-Saving Materials Co., Ltd.

Product Description: more>

Negotiable

Category: Others

Company: Beijing Yituo Technology Co., Ltd.

Product Description: With the advent of the Industry 4.0 era, digital transformation has become an inevitable trend for enterprise development. As a leading provider of digital twin solutions in the industry, Yituo Technology is committed to offering efficient and intelligent digital twin technical services to clients, driving the progress of industrial intelligence.I. Market Demand: Digital Transformation is ImperativeCurrently, enterprises face increasingly fierce market competition. To improve production efficiency and reduce operational costs, digital transformation has become a necessary path. As a key technology in digital transformation, digital twin technology effectively bridges the physical and digital worlds, providing comprehensive digital solutions for enterprises.II. Advantages of Digital Twin: Efficiency, Intelligence, and VisualizationDigital twin technology offers the following advantages:Efficiency: It can map real-time information such as production processes and equipment operations from the physical world to the digital world, enabling enterprises to quickly access data and improve production and management efficiency.Intelligence: Through big data analysis and artificial intelligence technology, it intelligently optimizes production processes, achieving automated and intelligent production.Visualization: Based on 3D models, digital twin technology intuitively displays data such as production processes and equipment operations, making it easier for enterprises to quickly identify and resolve issues.III. Success Stories: Digital Twin Technology Helps Enterprises Achieve Efficient ProductionYituo Technology has provided successful digital twin solutions to numerous enterprises. Here are two typical cases:A large manufacturing enterprise: By adopting Yituo Technology's digital twin solution, this enterprise achieved comprehensive digitalization of its production processes, improved production efficiency, reduced operational costs, and gained significant benefits.A smart city project: Yituo Technology provided a smart city digital twin platform for the city, enabling intelligent management in areas such as urban infrastructure, transportation, and environmental protection, improving urban management efficiency, and enhancing the quality of life for residents.IV. Technical Collaboration: Building the Strongest Technical Team in the IndustryYituo Technology actively collaborates with relevant technical partners, forming a strong technical team that includes expertise in the Internet of Things, big data, artificial intelligence, and other fields. Through technical collaboration, Yituo Technology can provide more comprehensive and efficient digital twin solutions to meet the diverse needs of clients.V. Industry Prospects: Digital Twin Technology Drives Industrial Intelligence DevelopmentWith the deepening development of the Industry 4.0 era, the application prospects of digital twin technology are becoming increasingly broad. In the future, digital twin technology will become more mature and its application areas will expand further. As a leading enterprise in the digital twin field, Yituo Technology will continue to innovate, providing clients with more advanced digital twin solutions to support the development of industrial intelligence.In summary, Yituo Technology is committed to becoming a leader in the digital twin field. Through continuous technological innovation and market expansion, it aims to provide clients with more efficient and intelligent digital twin technical services. Let us work together to drive the progress of industrial intelligence. more>

Negotiable

Category: Chemicals/Phenols/Hydroquinone

Company: Beijing Yituo Technology Co., Ltd.

Product Description:      To enable users to understand the entire development process of the crude gasoline pump P-202 leakage accident, personally experience the losses and damages caused by the crude gasoline pump P-202 leakage accident to the surrounding environment, equipment, personnel, etc., and serve as a warning for emergency response.  more>

$2300

Category: Others

Company: Shandong Jinglan Environmental Protection Engineering Co., Ltd.

Product Description: The pulverized coal distributor in steel mills is the core equipment of the blast furnace coal injection system, used to evenly distribute dry pulverized coal conveyed through a single pipeline to multiple injection pipes, ensuring the stability and uniformity of coal injection at the blast furnace tuyeres.Pipe Diameter and Number of Branches: Inlet pipe diameter DN50-DN125, branch pipe diameter 15/20/25mm, number of branches 6-35 pipes.Working Conditions:Pressure range: 1.6-2.5MPa; Temperature ≤80℃; Only applicable to dry pulverized coal medium.Wear-Resistant Design: Ceramic-lined or tungsten carbide-coated branches to extend service life.Precision Control: Distribution error ≤±3%, ensuring uniform combustion at the blast furnace tuyeres.Application ScenariosSuitable for pneumatic conveying systems in blast furnace coal injection in steel mills, power plants, pharmaceutical factories, and flour mills, addressing uneven distribution caused by coal powder inertial segregation.PrecautionsCone-type distributors, due to their lack of a throat structure and stable flow velocity, significantly reduce the risk of clogging and are superior to traditional ball-type designs. Selection should be based on pipe diameter, number of branches, and wear resistance requirements.The above comprehensive information is derived from mainstream industry technical documents and Shandong Jinglan specifications. Actual selection should be based on working condition parameters. more>

$860

Category: Metallurgy & Minerals/Mine Construction Equipment/Other Mining Construction Equipment

Company: Shandong Jinglan Environmental Protection Engineering Co., Ltd.

Product Description: The pulverized coal transport filter in steel mills is a critical protective device in the blast furnace coal injection system. It is primarily used to filter impurities in the coal powder (such as wood chips, fibers, and large particles) to prevent clogging of downstream components like distributors and spray guns, ensuring the continuous and stable operation of pneumatic coal powder transport. Its installation location and operational maintenance pointsInstallation LocationMust be positioned after the air supplement regulator at the outlet of the injection tank and before the distributor, forming a "regulator → filter → distributor" process flow.Install on horizontal pipelines to avoid powder accumulation in vertical sections.Maintenance RequirementsRegular Slag Removal: Inspect slag buildup on the filter plate each shift to prevent pipeline pressure buildup caused by increased differential pressure.Filter Plate Replacement: The service life of wear-resistant manganese steel filter plates is approximately 6-12 months; replace promptly if wear exceeds tolerance.Fault Contingency: A dual-filter parallel design allows for "one in use, one on standby," enabling slag removal without interrupting coal injection.Selection and Manufacturer RecommendationsSelection Basis: Match models based on pipe diameter (mainly DN100/DN125), system pressure (≥1.6 MPa), and wear resistance requirements (preferably ceramic-lined).Main Manufacturers:Shandong Jinglan (DN100 PN2.5 carbon steel filter)Beijing Lanhao (conical filter, suitable for dense-phase transport)Xiangye Environmental Protection (double-cone wear-resistant design)Precautions: Avoid ball-type filters (prone to throat clogging); prioritize cone-type designs without throats. Steel mills in northern regions require anti-freeze insulation to prevent coal powder moisture condensation and hardening. more>

Negotiable

Category: Chemicals/Pharmaceutical Raw Materials/Amino Acids & Derivatives

Company: Dazhou Jianjie New Materials Technology Co., Ltd.

Product Description: Price of Pre-gelatinized Starch for Fertilizer GranulesUsed in the production of granular fertilizers, cold water soluble   pure plant-based adhesive powder, harmless to soil   samples available   used by many manufacturers more>

Negotiable

Category: Others

Company: Jinan Xingtian Plastic Co., Ltd.

Product Description: The company is a manufacturer of plastic products and plastic goods located in Jinan, Shandong. It specializes in producing and processing molded plastic parts, plastic casings, plastic accessories, plastic components, plastic shells, plastic sockets, and other injection-molded items. It also offers custom processing for plastic bottles, plastic buckets, plastic boxes, plastic cups, plastic basins, food-grade meal containers, utensils, and other plastic products. The company supports custom orders with provided drawings or samples for precision plastic injection molds, with reasonable mold opening costs.As of May 2022, the company operates over 60 automatic injection molding machines using assembly line production. It has 7 spray painting and printing assembly lines, 1 testing laboratory, and 1 mold processing center. With 20 years of experience in manufacturing, the company uses high-quality PP and ABS materials, ensures high precision in injection mold production, provides timely product supply, offers direct factory sales, and maintains controllable processing costs and expenses. It is suitable for custom plastic products and finished goods for manufacturers in household appliances, automotive, electrical, electronics, toys, and medical industries. more>

Negotiable

Category: Chemicals/Rubber & Products/CR (Chloroprene Rubber)

Company: Jiangsu Zhuoya Environmental Protection Co., Ltd.

Product Description: more>

Negotiable

Category: Machinery & Equipment/Filter Materials/Other Filtration Materials

Company: Jiangsu Zhuoya Environmental Protection Co., Ltd.

Product Description: more>

Negotiable

Category: Chemicals/Chemical Intermediates/Intermediate Compounds

Company: Changzhou Jintan Liaoyuan Research Institute of Chemical Application Technology

Product Description:   CAS RN 113-48-4 EINECS Number 204-029-1 Molecular Formula C17H25NO2 Molecular Weight 275.3859   more>

$面议

Category: Electrical Equipment & Supplies/Wires & Cables/Other Wires & Cables

Company: Shandong Juyuan Electric Power Materials Co., Ltd.

Product Description: OPGW cable (also known as Optical Fiber Composite Overhead Ground Wire) integrates optical fibers into the ground wire of overhead high-voltage transmission lines to form an optical fiber communication network along the transmission line. This structural design combines the dual functions of a ground wire and communication, commonly referred to as OPGW cable. A 250μm optical fiber is inserted into a loose tube made of high-modulus material, which is filled with a waterproof compound. The loose tube is longitudinally wrapped with a layer of double-sided plastic-coated steel tape (PSP), and water-blocking material is added between the steel tape and the loose tube to ensure the cable's compactness and longitudinal water resistance. Two parallel steel wires are placed on both sides, and a polyethylene sheath is extruded to form the cable.Features: 1. Suitable for high-voltage lines exceeding 110kV with large spans (generally over 250M).2. Easy maintenance and resolution of line crossing issues, with mechanical properties capable of meeting large-span line requirements.3. The outer layer of OPGW is metal armor, which is unaffected by high-voltage electrical corrosion and degradation.4. OPGW installation requires power outages, resulting in significant outage losses. Therefore, OPGW should be used in newly constructed high-voltage lines of 110kV and above.5. In OPGW performance indicators, higher short-circuit currents require better conductor materials for armor, which correspondingly reduces tensile strength. To increase short-circuit current capacity while maintaining a certain tensile strength, the metal cross-sectional area must be enlarged, leading to increased cable weight and diameter, thereby raising safety concerns for line tower strength.Structure: OPGW cables are primarily used in 500kV, 220kV, and 110kV voltage level lines. Due to factors such as power outages and safety, they are mostly applied in newly constructed lines. There are three main types: aluminum-steel type, aluminum skeleton type, and (stainless) steel tube type.Ordering Information: 1. Provide the application scenario, such as: mountains and forests, river crossings, bridge crossings, submarine, ducts, wind farms, etc.2. Provide design requirements including fiber count, model span, tensile strength, cross-section, material requirements, etc.3. Specify the cable type required, such as central tube structure or stranded tube structure.4. For custom orders, provide other known detailed technical parameters or design drawings.Our company produces and sells supporting products:Optical cable fittings, power fittings, line fittings, tension clamps, suspension clamps, optical cable splice closures, excess cable brackets, downlead clamps, pole clamps, tower fasteners, vibration dampers, vibration dampening whips, corona rings, grounding wires, pre-formed armor rods, pre-formed repair rods, pre-formed splice rods, safety backup clamps, fiber terminal boxes, fiber distribution boxes, fiber cross-connect boxes, fiber splitting boxes, cabinets, racks, ADSS cables, OPGW cables, OPPC cables, submarine cables,入户光纤光缆, etc. more>

$2400

Category: Others

Company:

Product Description: Many people prefer to visit furniture markets to compare options before making a purchase. As a business owner, how can you make your furniture store the first destination customers head to in the market?It's common to offer customers a glass of water when they enter the store, with some high-end furniture shops even thoughtfully providing snacks and fruits. If you prepare a bottle of premium customized Bama water exclusive to your store, customers will not only inquire and examine the store information on the bottle label but also notice that it's Bama water—not just any ordinary water available on the market. This gesture makes them feel highly valued, and your store's image will leave a lasting impression, ensuring it doesn’t get lost in the market as just another random choice. A bottle of customized Bama water helps your store stand out among competitors! more>

$15

Category: Lighting/Energy Saving Lamps/LED Light Fixtures

Company: Shenzhen Langte Technology Co., Ltd.

Product Description: LangteGarage LED Tube Lights offer 5 styles for you to choose from, product introduction, featuresBelow are the possible 5 styles of Langte Garage LED Tube Lights from Shenzhen Langte Technology Co., Ltd., along with their product introductions and features:LT-T8 Radar Sensor Tube LightProduct Introduction: Available in multiple power options such as 8W, with a T8 diameter specification (approx. 26mm) and a common length of 1200mm. Supports AC185-265V wide voltage input, with a power frequency of 50/60Hz. Utilizes high-brightness, high-efficiency LED beads, with a color rendering index typically ≥70 and a common color temperature of 6000-6500K1.FeaturesHigh Efficiency and Energy Saving: Significantly more energy-efficient compared to traditional tube lights, e.g., an 8W tube can replace a traditional 18W LED fluorescent tube, greatly reducing energy consumption1.High Brightness and High Luminous Efficacy: Luminous efficacy up to 180lm/w, emitting 180 lumens of luminous flux per 1W of power consumed, providing brighter illumination at the same power1.Smart Sensing: Built-in millimeter-wave radar sensor operates on the Doppler effect principle. When a vehicle or pedestrian enters the sensing range, the tube light instantly turns to full brightness. After the vehicle or person leaves, after a certain delay, the tube light automatically switches to low brightness, effectively avoiding unnecessary energy waste1.Easy Installation: Compatible with traditional T8 lamp holders, allowing direct replacement of existing T8 fluorescent tubes without the need for extensive modification of the lamp bracket.LT-T5 Radar Sensor Tube LightProduct Introduction: Available in power options such as 18W, with a T5 diameter specification and various lengths to suit different installation positions. Also uses high-brightness LED beads, offering good color rendering and suitable color temperature, providing a comfortable lighting environment for garages7.FeaturesEnergy Saving: While meeting garage lighting needs, it significantly reduces energy consumption compared to traditional T5 fluorescent tubes, helping to save on electricity costs.Good Heat Dissipation: Utilizes surface-mount packaging technology with good heat dissipation performance, ensuring stable long-term operation and extending the product's lifespan.Various Specifications: Available in different lengths, allowing flexible configuration based on the actual size of the garage and lighting needs for precise illumination.Split-Type LED Garage Tube LightProduct Introduction: The tube light and bracket are separate, requiring wiring modifications during installation, such as removing the ballast and other original components for proper operation. Materials may include glass, aluminum-plastic, and other options.FeaturesPrice Advantage: The split-type design reduces costs to some extent, making it more affordable, suitable for garage lighting renovation projects with strict cost control.Easy Maintenance: The split structure allows for separate replacement of the tube light and bracket in case of damage, making repairs more convenient and reducing overall replacement costs.Integrated LED Garage Tube LightProduct Introduction: The tube light and bracket are integrated as one unit. After installation, it lights up immediately upon power connection without the need for complex wiring modifications. The housing is typically made of combinations such as aluminum + transparent PC, aluminum + striped PC, or aluminum + light-diffusing PC.FeaturesEasy Installation: No complicated wiring modifications required; it can be used directly after installation, greatly saving installation time and labor costs, especially suitable for quick installation and renovation projects.Aesthetically Pleasing: The integrated design gives the tube light a cleaner, more streamlined appearance, blending more easily with the overall garage environment. Different housing materials can also meet various aesthetic needs.Emergency T8 LED Radar Tube LightProduct Introduction: Based on the basic functions of the T8 radar tube light, it adds emergency functionality. In the event of a sudden power outage, the tube light can continue to provide illumination for a certain period, typically up to 90 minutes of emergency operation.FeaturesDual Protection: Can be used as both a daily radar-sensing lighting tube for smart dimming and energy saving during normal power supply, and as an emergency lighting device during power outages, ensuring some level of light in the garage to safeguard driving and personnel safety.Safe and Reliable: The addition of emergency functionality enhances the reliability of garage lighting. For underground garages with higher safety requirements, such as those in shopping malls or hospitals, it effectively handles emergencies, reducing safety risks. more>

$20

Category: Chemicals/Chemical Intermediates/Intermediate Compounds

Company: Jiaozuo City Libo Light Alloy Co., Ltd.

Product Description: Pei Yingying  1862587    9268Advanced DefinitionDefinition 8: The electrode with a more negative potential is called a sacrificial anode because, as the current continues to flow, the anode material is gradually consumed. As a sacrificial anode material, the metal or alloy must meet the following conditions: (1) The potential must be sufficiently negative to supply sufficient electrons to cause cathodic polarization of the protected metal equipment.System RequirementsSacrificial anodes are typically only economically applied to structures with low protective current requirements and in environments with low soil resistivity. Additionally, they are valuable when there is no power supply condition or when it is uneconomical.Sacrificial anode materials suitable for use in soil are primarily magnesium, while in seawater, zinc and aluminum are used. To maintain stable current output and reduce anode grounding resistance, chemical backfill should be used around sacrificial anodes in soil, mainly composed of 75% calcium sulfate, 20% bentonite, and 5% sodium sulfate. Sacrificial anodes should not be buried in coke. When used in groups, the distance between anodes should be at least 3m. The soil cover thickness above the anode should be at least 0.6m. To measure the off-potential, sacrificial anodes should be connected to the pipeline through a test box. When sacrificial anodes are used near AC traction systems, the continuous AC induced voltage on the anode body should not exceed 20V.Anode Requirements1. The potential must be sufficiently negative but not too negative to avoid hydrogen evolution reactions in the cathode region;2. The anode polarization rate should be low, and the potential and current output should be stable;3. The anode material should have a high electrical capacity;4. It must have high current efficiency;5. It should dissolve uniformly and detach easily;6. The material should be inexpensive and readily available;7. The corrosion products produced should be non-toxic, harmless, non-polluting, and pose no environmental hazards.UnderstandingElectrochemical oxidation of metals or alloys. The metal or alloy component is used as the anode, and an electrolytic method is employed to form an oxide film on its surface.The metal oxide film alters the surface state and properties, such as surface coloring, improving corrosion resistance, enhancing wear resistance and hardness, and protecting the metal surface. For example, aluminum anodizing involves placing aluminum or its alloys in a corresponding electrolyte (such as sulfuric acid, chromic acid, or oxalic acid) as the anode and performing electrolysis under specific conditions and with applied current. The aluminum or its alloy oxidizes at the anode, forming a thin layer of aluminum oxide on the surface, with a thickness of 5–20 micrometers. Hard anodized films can reach 60–200 micrometers. After anodizing, aluminum or its alloys exhibit increased hardness and wear resistance, up to 250–500 kg/mm², good heat resistance (the melting point of hard anodized films is as high as 2320K), excellent insulation (withstand voltage up to 2000V), and enhanced corrosion resistance (withstand thousands of hours in ω=0.03 NaCl salt spray without corrosion). The oxide film layer contains numerous micropores that can adsorb various lubricants, making it suitable for manufacturing engine cylinders or other wear-resistant parts. The strong adsorption capacity of the film micropores allows for coloring into various beautiful and vibrant hues.Non-ferrous metal alloy casting, anti-corrosion material sales, non-ferrous metal rolling processing; sales of high-performance non-ferrous metals and alloy materials, general equipment manufacturing; engineering technology, petroleum and natural gas technical services: wire and cable operations, marine energy systems and equipment manufacturing, sales of electrical instruments and meters, technical services, technical development, technical consulting, technical exchanges, technology transfer, technology promotion, import and export of goods.Pei Yingying 1862587  9268 more>

$20

Category: Chemicals/Chemical Intermediates/Intermediate Compounds

Company: Jiaozuo City Libo Light Alloy Co., Ltd.

Product Description: Pei Yingying   1862587  9268When cathodic protection is applied to a system, meaning a cathodic current is applied to polarize the cathode, the overall potential of the system shifts in the negative direction, such as to point 1. At this point, the total current on the cathode is I1, corresponding to the segment E1Q. Part of this current is externally applied, equivalent to segment PQ, while another portion still arises from the high corrosion of the anode, equivalent to segment E1P. It can be observed that the corrosion current I at the anode is smaller than the corrosion current Ic, indicating a reduction in the anode's corrosion rate and thus achieving a certain degree of protection.As the externally applied current continues to increase, the system's potential further shifts in the negative direction. When the potential reaches the equilibrium potential of the anode, the anode's corrosion current becomes zero, achieving complete protection. At this point, the cathodic current Ip (equivalent to the segment) is entirely externally applied. This externally applied current is referred to as the minimum protective current, and the corresponding potential is called the minimum protective potential (generally, polarizing the metal from its stable potential by 200–300 mV in the negative direction in seawater can achieve complete protection).(1) Main Parameters of Cathodic Protection: Protective PotentialProtective potential refers to the potential value required to halt metal corrosion during cathodic protection. To completely stop corrosion, the protected metal must be polarized to the active anode's open-circuit potential. For steel structures, this potential is the equilibrium potential of iron in the given electrolyte solution.The protective potential has a specific range. For example, the protective potential for iron in seawater ranges from -0.80 to -1.0 V (relative to a silver/silver chloride electrode). When the potential is more positive than -0.80 V, iron cannot achieve complete protection, so this value is also referred to as the minimum protective potential.The protective potential value is often used as a criterion to determine whether cathodic protection is complete. By measuring the potential values at various parts of the protected structure, the protection status can be assessed. Therefore, the protective potential value is an important indicator for designing and monitoring cathodic protection.2) Protective Current DensityThe current density required to reduce the metal's corrosion rate to an acceptable level during cathodic protection is called the minimum protective current density. The minimum protective current density corresponds to the minimum protective current. To achieve the minimum protective potential for the metal, the current density must not be lower than this value; otherwise, satisfactory protection cannot be attained. If the applied current density significantly exceeds this value, overprotection may occur, leading to excessive energy consumption and reduced protective effectiveness.As one of the main parameters of cathodic protection, the minimum protective current density depends on factors such as the type of metal being protected, the nature of the corrosive medium, the total circuit resistance in the protection system, the presence and type of coatings on the metal surface, and external environmental conditions. It must be determined based on experience and practical circumstances. Table 3-8 lists the required current densities for steel in different environments.(2) Factors Influencing Cathodic ProtectionSince cathodic protection is based on cathodic polarization of the protected metal's surface, the polarization characteristics of the original corrosion cell significantly impact cathodic protection.1) When the cathodic polarization is high and the anodic polarization is low, the corrosion of the protected metal is primarily cathodically controlled. In such cases, complete protection is easier to achieve. If the cathodic polarization curve falls within the diffusion-controlled region and the protective potential lies within this range, Ip is approximately equal to Icorr.2) When the cathodic and anodic polarization rates are equal, or when the anodic polarization is high, as shown in the polarization curve in Figure 3-7, achieving complete protection by bringing the system to the protective potential EA requires Ip >> Icorr, meaning the protective current must be much larger than the corrosion current.3) An increase in the corrosiveness of the surrounding medium will raise the required protective current. Increases in chloride ion concentration, oxygen content, and medium agitation speed (e.g., increased flow velocity in seawater) all reduce cathodic polarization, thereby increasing the current required for polarization and raising the protective current.Variations in the chemical composition of the medium, oxygen content, types of ions, and the amount of suspended matter all affect cathodic protection. Differences in oxygen content or changes in medium conductivity can alter the anodic polarization rate, causing the required cathodic protection current to change. An increase in suspended matter can cause abrasion on the cathode surface, reduce cathodic polarization, increase the corrosion current, and correspondingly raise the protective current.Temperature also affects polarization rates. An increase in temperature reduces oxygen solubility but accelerates diffusion and electrode reaction rates, ultimately increasing the protective current density.(3) Anti-Corrosion CoatingsAnti-corrosion coatings on metal surfaces can isolate the metal from the surrounding medium. However, since coatings are not entirely impermeable, they contain tiny pores and defects where localized corrosion can occur. The combined use of anodic protection and coatings protects these localized areas, resulting in a much lower required protective current density compared to bare metals during cathodic protection.During cathodic protection, a calcareous deposit layer forms on the anode surface due to an increase in pH, known as an electrolytic coating. This coverage increases surface resistance, reduces the corrosion current density, and enhances anti-corrosion effectiveness.Since the formation of a calcareous deposit layer significantly lowers the protective current density and makes potential distribution more uniform, the cathodic protection process often initially involves applying a higher current density to quickly form a dense calcareous layer on the surface, followed by a lower current density for maintenance.Pei Yingying   1862587   9268 more>