有机型涂层镀锌板

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20世纪80年代末，日本新日铁公司开发了一种自润滑镀锌板，可用于电机壳体的冲压加工。
首先对镀锌板表面进行铬酸盐钝化处理，然后涂上几微米厚的有机润滑膜。该产品不仅具有良好的耐腐蚀性，而且具有优良的润滑性能。不久将用于各种电器和油罐的冲压工艺。

At the end of 1980s, Nippon Steel Company of Japan developed a kind of self-lubricating galvanized sheet, which can be used in the stamping process of motor shell.

Firstly, the surface of the galvanized sheet is passivated with chromate, and then the organic lubricating film with a thickness of several microns is coated. This kind of product not only has good corrosion resistance, but also has excellent lubrication performance. It will soon be used in the stamping process of various electrical appliances and oil tanks.
In the 1990s, the production and application of this kind of organic self-lubricating coating has been commercialized, which occupies a leading position in the world and is the most representative. However, the self-lubricating coating is an organic lubricating film containing chromium, which is harmful to the environment.
In 1984, NKK steel pipe company of Japan developed a thin organic high lubricity composite coating uz-l with polyethylene as lubricant and polyurethane as base resin in order to improve the environmental pollution caused by chromium coating on galvanized sheet. In 1993, the coating uzsl was developed.
Uz-l and uz-sl are suitable for complex stamping process and keep good appearance after forming. The organic composite coating uz-c3 was developed in 1996. It takes modified vinyl resin as the main film-forming resin and has high lubricity and excellent coating adhesion.
In the early 1990s, Kawasaki iron company developed river zinc FS with chromium passivation layer and organic resin coating. It has excellent corrosion resistance, formability, surface quality and fingerprint resistance, but its conductivity and weldability are not ideal. After that, fc-s was developed with better formability. A two-step production process was adopted, in which chromium free passivation treatment was carried out on the galvanized sheet first, and then a lubricating film was applied to form an environmental friendly self-lubricating double coating on the surface of the galvanized sheet.
For the three main products gi-f, ga-f and eg-tj of self-lubricating coating of galvanized sheet, the comparative test between them and zinc sheet was carried out by Koyama iron making Institute and Sumitomo Metal.
Among them, gi-f coating and ga-f coating are respectively made on hot-dip galvanized sheet and aluminum zinc sheet by chromate passivation treatment and coating organic high lubricating film; eg-tj coating is made on electro galvanized sheet by coating organic resin lubricating film containing chromium. The results show that the three self-lubricating coatings have excellent lubricity and corrosion resistance compared with the substrate surface.
In addition, Kobe Steel has developed self-lubricating galvanized steel sheet with polyethylene resin as matrix, wax as lubricant and colloidal SiO2 to improve corrosion resistance.