Electrolysis: processes – compositions used therein – and methods – Electrolytic coating – Depositing predominantly alloy coating
Patent
1994-01-12
1997-04-08
Gorgos, Kathryn L.
Electrolysis: processes, compositions used therein, and methods
Electrolytic coating
Depositing predominantly alloy coating
205252, 205253, 205254, C25D 356, C25D 360
Patent
active
056184026
ABSTRACT:
A tin-zinc alloy electroplating bath comprises an amphoteric surfactant, a water-soluble stannous salt, a water-soluble zinc salt and a balance of water. When the tin-zinc alloy plating bath of the present invention is used, the formed coating film comprises a uniform alloy composition even in case where the current density varies over a wide range. Therefore, the coating film having the uniform alloy composition can be formed even on the substance having a complicated shape and the chromate treatment becomes satisfactory. As a result, the effect of the coating is improved, the resultant product is stable and the productivity is improved. Thus the tin-zinc alloy coating film having a high quality can be provided.
REFERENCES:
patent: 4163700 (1979-08-01), Igarashi et al.
patent: 4384930 (1983-05-01), Eckles
patent: 4652347 (1987-03-01), Kobayashi
patent: 4701244 (1987-10-01), Nobel et al.
Vagramyan et al. Some features of the electrodeposition of zinc-tin alloy from pyophosphate electrolytes in the presence of surfactants Zashch. Met. 22(4) 615-17 (Russ), 1986 (no month):English ab., article unavail.
Surface Treatment Technology Abstracts, vol. 29, No. 2, pp. 84, Mar./Apr. 1987, L. K. Bobrovskii, et al., "Electrolyte for Electrodeposition of Tin-Zinc Alloy Coatings" (nat trans Dec. 2).
Galvanotechnik, vol. 82, No. 9, p. 3046, Sep. 1991, "Galvanische Zinn-Zink-Uberzuge Als Cadmiumersatz" (nat trans Dec. 2).
Ohnuma Tadahiro
Sakurai Hitoshi
Dipsol Chemicals Co., Ltd.
Gorgos Kathryn L.
Wong Edna
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