1. Intergranular corrosion of metal die castings:

Harmful impurities in the hardware components: lead, cadmium and tin will accumulate at the grain boundary, causing intergranular corrosion. The metal matrix will break due to intergranular corrosion. Parts will be expanded and lifted by the intergranular corrosion coating. Bubbles will be generated on the surface of castings. Especially in the humid environment, intergranular corrosion will cause deformation, cracking and even failure of castings.

2. Hardware die-casting hole problem:

The stomata are mainly in contraction mechanism, most of which are round and irregular.

(1) Causes of air holes: a During mold filling and solidification of liquid metal, due to the invasion of gas, air holes will be formed on the surface or inside of the casting, and the gas evaporated from the coating will invade

(2) If the gas content in the alloy liquid is too high, precipitation will occur during solidification.

With the rapid development of the die casting industry, the die casting process has become a widely used and rapidly developing metal hot forming process, especially the metal die casting and aluminum alloy die casting, especially the popular metal die casting, which is very important for people,