1. Principle
Because zinc is not easy to change in dry air, and in humid air, a very dense zinc carbonate film can be formed on the surface, which can effectively protect the interior from corrosion. And when the plating layer is damaged for some reason to expose a small substrate, the zinc and steel substrate form a micro-battery, and the fastener substrate becomes the cathode for protection. It is widely used in automobile transportation and other industries, but it needs trivalent chromium passivation layer and zinc-nickel alloy plating seal coating to reduce the harmful and toxic layer of hexavalent chromium passivation.
2. Performance characteristics
The zinc coating is thick, with fine crystals, uniformity and no porosity, and good corrosion resistance; the zinc coating obtained by electroplating is relatively pure, and corrodes slowly in the mist of acid and alkali, which can effectively protect the fastener matrix. The zinc coating is chromic acid After passivation, it forms white, colorful, military green, etc., which is beautiful and decorative. Because the galvanized layer has good ductility, it can be cold punched, rolled, bent and other forming without damaging the coating .
3. Application scope
The fields involved in electro-galvanization are becoming more and more extensive. The application of fastener products has spread to machinery manufacturing, making galvanized chain link fences, electronics, precision instruments, chemicals, transportation, and aerospace, which are of great significance in the national economy.
