The quality of zinc-aluminum alloy is crucial. Poor quality can lead to defects such as rough zinc particles appearing on the surface of the galvanized layer after adding it to the zinc liquid. Therefore, the grades of aluminum ingots and zinc ingots used to produce zinc-aluminum alloy must be high, typically Grade 0 or Grade 1, with an iron content not exceeding 0.003%.
When casting zinc-aluminum alloy blocks in a smelting plant, zinc and aluminum should be melted at a temperature of 650-700°C and held at that temperature for 1.5-2 hours, with constant stirring to ensure thorough mixing of zinc and aluminum. Stirring should also be continued during pouring.
