Design and Production of Magnesium Alloy Sacrificial Anodes

Chang Qing

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Magnesium alloy sacrificial anodes are corrosion control materials used for cathodic protection, featuring a more negative corrosion potential and higher current efficiency compared to the protected metal. These materials are primarily used for protecting metal structures in soil and freshwater environments. Their characteristics include excellent electrochemical performance, uniform anode consumption, long service life, and high electrical output per unit mass. Magnesium alloy sacrificial anodes are suitable for soil or freshwater environments with resistivity ranging from 20 to 100 ohm-meters. Parameters such as design life, current efficiency, theoretical electrical capacity, and anode utilization rate demonstrate their superiority as sacrificial anode materials. Additionally, magnesium alloy sacrificial anodes have a low specific gravity, relatively negative potential, high driving voltage for iron, and low current efficiency, making them particularly suitable for high-resistivity media. These properties make magnesium alloy sacrificial anodes ideal materials for cathodic protection.

National standard models of magnesium alloy sacrificial anodes include MG-8, MG-11, MG-14, and MG-22. These models are mainly used for anti-corrosion protection in projects such as underground and freshwater oil and gas pipelines, water supply and drainage pipelines, underground cables, chemical industries, communications, harbors, ships, and reservoir gates.

Common weight specifications for magnesium alloy sacrificial anodes include 4 kg, 8 kg, 11 kg, 14 kg, and 22 kg.

As an anti-corrosion material, magnesium alloy sacrificial anodes are widely used in fields such as construction, ships, bridges, and hydraulic engineering. They come in various models and weights, with common specifications including 4 kg, 8 kg, 11 kg, 14 kg, and 22 kg anti-corrosion kit magnesium alloy sacrificial anodes. These models are suitable for different application scenarios, such as anti-corrosion protection for underground and freshwater oil and gas pipelines, water supply and drainage pipelines, underground cables, chemical industries, communications, harbors, ships, and reservoir gates. The execution standard for magnesium alloy sacrificial anodes is GB/T 17731-2009. Their chemical composition includes alloy elements such as aluminum, zinc, manganese, and magnesium, as well as controlled impurity elements like iron, copper, nickel, silicon, and calcium, ensuring excellent anti-corrosion performance and safety.