The inevitable defect of zinc alloy die-casting - intergranular corrosion.automotive metal stamping companies.automotive metal stamping suppliers

　　Zinc alloy die casting is one of the most commonly used die casting process, die casting quality is good, high precision, but also very suitable for a variety of surface treatment, so that die casting parts to obtain a colorful appearance, can improve the value of many die casting, and zinc alloy die casting rarely defects, yield can reach 99%, but zinc alloy die casting has an inevitable defect, that is, grain boundary corrosion.

　　Intergranular corrosion of zinc alloy die casting is caused by lead, chromium, tin and other elements contained in zinc alloy die casting, these elements are equivalent to impurities in zinc alloy, they will gather in the gap between the grain and the grain of zinc alloy, that is, the grain boundary of zinc alloy, and then corrosion begins from the grain boundary, destroying the binding force between the grain of zinc alloy die casting. The mechanical strength of zinc alloy die casting is greatly reduced, and once affected by external force, zinc alloy die casting will break along the grain boundary.

　　The danger is that after zinc alloy die casting occurs this corrosion, its appearance still has a certain metallic luster, so it can not be seen from the appearance, zinc alloy die casting can not avoid grain boundary corrosion, only by reducing the content of lead, chromium, tin and other impurities in zinc alloy to reduce the phenomenon of intergranular corrosion, which is also the reason why zinc alloy die casting life is not as long as other die casting parts. Otherwise, zinc alloy die casting will become the most important die casting process.

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