Zinc-aluminum alloy ingots are cast thin blocks formed by co-melting a certain amount of pure zinc with a certain amount of pure aluminum. In hot-dip galvanizing production, it is difficult to add pure aluminum directly because the temperature of the zinc bath is only between 470 and 510°C, while the melting point of aluminum is 660°C. However, the binary equilibrium diagram of zinc and aluminum reveals that when the aluminum content is approximately 7% and the zinc content is around 93%, the eutectic temperature is only about 380°C. Zinc-aluminum alloy ingots prepared in this ratio can be easily dissolved in the zinc bath, making it much more convenient to add the required aluminum element to the zinc bath through this method.
In actual production, to facilitate the calculation of aluminum content in the zinc bath, zinc-aluminum alloy ingots are also made with a composition of 10% pure aluminum and 90% pure zinc.
