Replacement of A21C-1 aluminum alloy sacrificial anode on the inner wall of the storage tank, weight 35kg.

Replacement of A21C-1 aluminum alloy sacrificial anode for tank inner wall, weight 35kg‌

Aluminum alloy sacrificial anode for storage tanks‌ is an important cathodic protection material widely used in the inner walls of storage tanks in industries such as petroleum and chemical to prevent corrosion of metal structures. Aluminum alloy sacrificial anodes utilize the differences in electrochemistry between metals, where the aluminum alloy acts as the anode and corrodes, thereby protecting other metals (such as the inner wall of the tank) from corrosion. This protection method is based on electrochemical principles, achieving cathodic protection for the inner wall of the tank through the dissolution of the aluminum alloy anode and the flow of current‌12.

Main Performance

1. ‌High electrochemical performance‌: Aluminum alloy sacrificial anodes have excellent electrochemical performance, with a relatively negative electrode potential and high current efficiency, providing continuous and stable current output‌1.
2. ‌High power output‌: The power output per unit weight of anode material is high, approximately 3 times that of zinc anodes and 2 times that of magnesium anodes‌1.
3. ‌Strong self-regulating capability‌: In seawater and other media containing chloride ions, aluminum alloy sacrificial anodes have a strong self-regulating capability for current output, adapting to the needs of different environments‌1.
4. ‌Thermal stability‌: In high-temperature environments, although the electrical capacity decreases as temperature increases, aluminum alloy sacrificial anodes can still maintain a certain level of anti-corrosion effect‌34.

Application Range

Aluminum alloy sacrificial anodes are mostly used for cathodic protection of metal structures in seawater environments or the inner bottom plates of crude oil storage tanks. However, they cannot be directly used in soil environments with low chloride ion content (for indium-containing anodes, chloride ion content must be greater than 1000 ppm; for mercury-containing anodes, it must be greater than 10,000 ppm)‌13.

Installation and Maintenance

Aluminum alloy sacrificial anodes are usually directly fixed to the inner wall of the protected storage tank, without the need for additional fillers. During installation, it is necessary to ensure that the anode is in close contact with the inner wall of the tank to form a good current path. During use, aluminum alloy sacrificial anodes will gradually deplete, so regular inspection and replacement are required. At the same time, the inner wall of the tank should be kept clean and dry to improve the anti-corrosion effect‌