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 not too large matrix is exposed, zinc and steel matrix form microcells, so that the fastener matrix becomes cathode and is protected. It is widely used in automobile transportation and other industries, but what is needed is trivalent chromium passivation layer and zinc-nickel alloy plating closing coating to reduce the harmful and toxic layer of hexavalent chromium passivation.
2, performance characteristics. Zinc coating is thick, fine crystallization, uniform and no porosity, good corrosion resistance; Is pure, the zinc plating layer in acid, alkali corrosion slower, such as fog Eng effectively protect tight sand-fixation matrix, the galvanized layer formed after chromate passivation, color white, army green, beautiful and easy, have certain adornment sex, because the galvanized layer has good ductility, and therefore can be rushed, rolling, cold bending and forming and not damage the coating.
3. Scope of application. Electro galvanizing involves more and more extensive fields, fastener products have been widely used in machinery manufacturing, electronics, precision instruments, chemical industry, transportation, aerospace and so on in the national economy has great significance.
Post time: 11-04-22