Process for the manufacture of a coated stainless steel sheet

Electrolysis: processes – compositions used therein – and methods – Electrolytic coating – Coating predominantly single metal or alloy substrate of...

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205218, 205226, 205228, C25D 536, C25D 550

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054338395

ABSTRACT:
This sheet metal comprises a substrate (12) made of stainless steel containing more than 16% of chromium in its weight composition, coated with a metal layer (16) containing chiefly tin. Between the metal layer (16) and the substrate (12) the sheet metal comprises a layer (14) of an intermetallic compound containing at least iron, chromium and tin. To manufacture this sheet metal, a layer (16) of metallic coating containing chiefly tin is deposited by an electrolytic route on a sheet (12) made of stainless steel. The coated sheet metal is heated to a temperature above the melting temperature of the coating layer (16) to permit the formation of the intermetallic compound. The heating is maintained for a sufficient period for the surface of the coating layer (16) to have a matt appearance.

REFERENCES:
patent: 1776603 (1930-09-01), Schulte
patent: 2973307 (1961-02-01), Hahn
patent: 4764260 (1988-08-01), Gay et al.
F. A. Lowenheim, Electroplating, McGraw-Hill Book Co., New York, 1978, pp. 67-89, 306-319.
Metal Finishing Guidebook and Directory for 1978, Metals and Plastics Publications, Inc., Hackensack, N.J., pp. 155-159 and 293-313.
Verlag Stahlschlussel Wegst GmbH, 1989, pp. 374-375, A. C. W. Wegst, "Stahlschlussel".
Chemical Abstracts, vol. 102, No. 2, Jan. 1985, Columbus, Ohio, US; abstract No. 14113a, "Pretreatment for Plating Stainless Steels" p. 488 (Abstract) & JP-A-59 145 795 (Furukawa Electric Co., Ltd) 21 Aug. 1984.
Patent Abstracts of Japan vol. 14, No. 299 (C-733)(4242) 27 Jun. 1990 & JP-A-29 7 695 (Kawasaki Steel Corporation) 10 Apr. 1990 (Abstract).
Patent Abstract of Japan vol. 11, No. 176 (C-426)(2623) 5 Jun. 1987 & JP-A-62 1 896 (Masami Kobayashi) 7 Jan. 1987 (Abstract).

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