According to statistics, steel is easy to rust in air, water or soil, or even completely lost, and the annual loss caused by corrosion accounts for about 1/10 of the entire steel production. In order to make the surface of the fastener have a special function and give its surface a decorative appearance, it is generally treated by electric galvanizing.
Craft wire
1. Principle. Because zinc is not easy to change in dry air, and in humid air, the surface can generate a very dense zinc carbonate film, which can effectively protect the interior from corrosion. And when the coating is damaged for some reason and the matrix is not too large, the zinc and steel matrix form a microbattery, so that the fastener matrix becomes the cathode and is protected. It is widely used in automobile transportation and other industries, but what is needed is a trivalent chromium passivation layer and a zinc-nickel alloy plated sealing coating to reduce the harmful and toxic layer of hexavalent chromium passivation.
2. Performance characteristics. The zinc coating is thick, the crystallization is fine, uniform and no porosity, and the corrosion resistance is good. The zinc layer obtained by electroplating is relatively pure, corroded slowly in the fog of acid and alkali, and effectively protects the matrix of the sand fixing parts. The galvanized layer forms white, color, military green, etc., after passivation by chromic acid, which is beautiful and easy to see, and has certain decorative features. Because the galvanized layer has good ductility, it can be cold-blanking, rolling, bending and other forms without damaging the coating.
3. Scope of application. The fields involved in galvanizing are more and more extensive, and the application of fastener products has been throughout machinery manufacturing, electronics, precision instruments, chemical industry, transportation, aerospace, etc., which is of great significance in the national economy.
Post time: 24-08-23