Although zinc alloy die castings are widely used, in some cases, there are still more stringent methods of use. The following are the precautions for the use of three zinc alloy die-casting fragments:
1. First of all, the corrosion resistance of zinc alloy die-casting parts is poor. If the content of impurity elements (such as lead, cadmium and tin) in the product is too large, it will cause the casting to age and deform, which is manifested as volume expansion. The mechanical properties, especially the plasticity are significantly improved and reduced, and the time is even longer.
2. Secondly, the zinc alloy die-casting parts have relatively high temperature requirements. If used in high and low temperature environments, the tensile strength and impact performance will be greatly reduced. In addition, the service life at room temperature will be greatly shortened, and it has better mechanical properties.
3. The latter is the aging effect. The structure of zinc alloy is mainly composed of a zinc-rich solid solution containing Al and Cu and an Al-rich solid solution containing Zn, and their solubility decreases as the temperature decreases. However, due to the extremely fast curing speed of die castings, the solubility of the solid solution is greatly saturated at room temperature. After a period of time, this supersaturation phenomenon will gradually disappear, and the shape and size of the casting will also slightly change.
