Zinc alloy sacrificial anodes are suitable as cathodic protection design materials for metal components in electrolytes such as seawater, brackish water, brine, and soil with a temperature lower than 50°C and a resistivity less than 150 Ω·m. These include ships, mechanical equipment (such as condensers and seawater pumps), ballast water tanks, port facilities, offshore engineering (drilling platforms, steel wharves, water drums, seawater cooling water systems), slipways in low - resistivity soil, buried metal pipelines, storage tanks, cables, and other steel - structured facilities.
In the composition of cast zinc alloy sacrificial anodes, the zinc content should be not less than 99.314%, and in high - purity zinc alloys, the zinc content should be not less than 99.95%. For the zinc anode products produced by our company, pre - furnace chemical composition analysis is carried out for each batch. The casting surface should be free of defects such as oxidation slag, burrs, fins, cracks, and shrinkage cavities. The iron parts should be clean, rust - free, and undergo galvanizing or sand - blasting treatment. In addition, the contact resistance between the anode body and the iron legs is measured.