Dx51d galvanized sheet material is a non-ferrous alloy mainly composed of zinc as the matrix and other elements. The main alloy elements are aluminum, copper, magnesium, etc. Zinc alloy has low melting point, good fluidity, easy plastic processing and welding, and is resistant to atmospheric corrosion. According to the manufacturing process, it can be divided into cast zinc alloy and deformed zinc alloy. The commonly used cast zinc alloy is zinc aluminum copper magnesium alloy. Its casting process performance is good, and the cooling rate has little impact on the mechanical properties. It is mainly used to manufacture mechanical parts, toys, decorations, household appliances, etc. The commonly used wrought zinc alloys are zinc aluminum alloy and zinc copper alloy. The former contains 4%~15% aluminum. In order to improve the strength and hardness of the alloy, a small amount of copper, magnesium and other alloy elements are added. It has high strength and is easy to form. It can replace some brass or duralumin to make precision forgings. The latter is 0.7%~1.5% copper, which can increase the strength and impact toughness of the alloy and reduce the plasticity. Zinc copper alloy is suitable for making daily hardware products or replacing part of brass.