Process for electroplating stainless steel strips with zinc or z

Details Process for electroplating stainless steel strips with zinc or z Process for electroplating stainless steel strips with zinc or z

1988-05-03

1990-11-13

Niebling, John F.

Chemistry: electrical and wave energy

Processes and products

204 34, C25D 536, C25D 706

Patent

active

049699806

ABSTRACT:
An exterior stainless steel sheet is provided comprising a stainless steel substrate and a coating layer formed on one surface of the steel substrate from Al, Al alloy, Zn or Zn alloy to a thickness of 0.1 to 70 .mu.m, preferably 1 to 70 .mu.m. A Zn or Zn-Ni alloy plated stainless steel strip is prepared by degreasing a stainless steel strip, substantially activating the surface of the strip, and electroplating the strip by immersing the strip in a hydrochloric acid solution having a concentration of 0.5 to 40 wt % in a zinc or zinc-nickel alloy plating bath at pH 3.5 or lower. Alternatively, activation may be carried out by cathodic electrolytic treatment in a hydrochloric acid solution having a concentration of 0.5 to 40 wt % at a current density of 0.1 to 100 A/dm. During electroplating of one side, the other side of the strip not to be plated is covered with a protective film. A stainless steel sheet comprising a stainless steel substrate and a coating layer formed on one surface of the steel substrate from Zn or Zn alloy to a thickness of 0.1 to 50 .mu.m, preferably 1 to 50 .mu.m is useful in preparing welded pipes.

REFERENCES:
patent: 3201211 (1965-08-01), Renshaw et al.
patent: 3830634 (1974-08-01), Zaremski et al.
patent: 4367125 (1983-01-01), Avellone
patent: 4582573 (1986-04-01), Perovich
patent: 4672007 (1987-06-01), Teng et al.
F. A. Lowenheim, Electroplating, McGraw-Hill Book Co., N.Y., 1978, p. 88.
F. A. Lowenheim, Modern Electroplating, John Wiley & Sons, Inc., N.Y., 1974, pp. 442-453, 583-587.

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