Zinc plating chromic acid salt after the passivation, corrosion resistance can improve 6 to 8 times.
锌镀层经铬酸盐钝化之后，耐蚀性可提高6 ~ 8倍。
2
By the reduction on industrial Chromic anhydride-methanol, the trivalent chromium main salt was made. The technological formula and standard of Chromium-Nickel alloy electroplating were given.