Around (1) 1907, E.P.Schock and A.Hirsch published papers on sulfate zinc-nickel alloy electroplating.

(2) 1943, B.Lustman published a paper on zinc-nickel alloy chloride electroplating.

⑶ In 1947, Schantz applied for American patent, and proposed that adding nickel salt into acidic zinc plating bath can obtain an alloy containing nickel 15%, and its corrosion resistance is better than that of zinc plating layer.

⑷ 1956 T.L.Ramachar studied the pyrophosphate system in detail, and expounded the relationship between coating properties and structure.

5]1969E.J. Rochl applied for the patent of zinc-nickel acetate twice, and expounded the relationship between the content of each component of the alloy coating and the corrosion resistance.

[6] In 1972, Hartford proposed a zinc-nickel alloy plating solution containing brightener, and the coating contained 2% ~ 18% nickel.

Once1983 Saya Xiuyan has done a lot of research on the process of Zn-Ni alloy on steel substrate. Sulfate or chloride is mainly used in the plating solution, and an appropriate amount of buffer is added to maintain a stable pH value. The process operation is relatively simple. At present, Erben Jiayou Metal Co., Ltd. has been applied in production.

⑻ Zinc-nickel alloy brightener Zinloy is sold as a commodity by Ibara Co., Ltd. of Japan, and the coating contains 7% ~ 8% nickel. The dispersion ability and nickel plating ability of the plating solution are good, and the appearance of the coating is bright and beautiful. After passivation, the salt spray test can reach 2000 hours.

⑼ The bright leveling liquid invented by Shende et al. contains 10% ~ 12% nickel, which can replace the cadmium layer.

⑽ Japanese PatentNo. 58-34 189 proposed a bright zinc-nickel alloy plating solution, and its corrosion resistance was 4 ~ 10 times higher than that of zinc.

⑾ Rynne proposed that adding hydroxyethyl nonanoate l2g/L and o-chlorobenzaldehyde lg/L into the zinc-nickel plating bath can obtain a fully bright coating in the range of 0. 13a/dm2.