Corrosion-resistant magnesium alloy sacrificial anode | Magnesium anode

Corrosion-Resistant Magnesium Alloy Sacrificial Anode | Magnesium Anode

Jiaozuo Libo Light Alloy Co., Ltd.

Chang Qing 13939157916

Characteristics and Functions of Magnesium Anode:

Magnesium anode, also known as magnesium alloy anode or magnesium sacrificial anode, is used in cathodic protection systems as essential equipment and material to prevent electrochemical corrosion. It features low density, high theoretical capacitance, negative potential, low polarization rate, and a large driving voltage for steel (>0.6V), making it suitable for protecting metal components in high-resistivity soil and freshwater environments. Classification of Magnesium Anodes:

Based on production processes, they are mainly divided into cast anodes and extruded anodes.

Based on applications, they are primarily categorized as water heater anodes and engineering anodes.

Based on shapes, they include rod-shaped, strip-shaped, D-type, S-type, and custom-shaped anodes.

Based on materials, they are mainly classified as AZ63, AZ31, AZ91, etc.

Applications of Magnesium Anodes:

Typically, D and S-type anodes are used in soil environments, strip anodes are applied in high-resistivity soil, freshwater, and confined spaces as engineering anodes, while rod anodes are commonly used for corrosion protection in electric water heaters and boilers.

Magnesium anodes are specialized corrosion protection materials for cathodic protection engineering. They possess high electrochemical performance, consume uniformly, have a long service life, and generate significant current output, making them suitable for cathodic protection of metal structures in soil and freshwater media. During the cathodic protection process, magnesium anodes deplete evenly, ensuring prolonged service life. In practical applications, they provide more effective structural protection. In soils with resistivity greater than 8000 ohm·m, the use of magnesium anodes is recommended.

Description of Magnesium Anode Thermite Welding:

1. First, remove a section of the pipeline's anti-corrosion layer, creating a rectangular opening matching the size of the thermite mold.

2. Place the cable from the magnesium anode package into the notch at the bottom of the thermite welding mold. Position the mold on the pipeline, open the mold cover to expose the cable, and place a small iron piece with its bowl shape facing upward at the bottom of the mold.

3. Welding involves large and small packets. First, pour the large packet of thermite powder, then evenly spread the small ignition powder on top, also applying some around the ignition port of the mold. Close the mold cover.

4. Ignite at the mold port using a flame (wear gloves during ignition, avoid looking directly at the ignition port, and use pliers to press the mold cover). It ignites instantly, welding the cable and pipeline into a solid copper nugget, ensuring a very strong bond.

5. Then, fill the damaged area with a repair stick to level it.

6. Heat the repair patch with a flame to adhere it tightly to the opening, sealing the damaged area...