C - Chemistry – Metallurgy – 25 – D
Patent
C - Chemistry, Metallurgy
25
D
204/25.5
C25D 5/12 (2006.01)
Patent
CA 1242669
ABSTRACT OF THE DISCLOSURE The present invention relates to a surface treated steel sheet having three layers consisting of a bottom layer of metallic chromium, a middle layer of metallic tin or tin-nickel alloy and a top layer of hydrated chromium oxide on a steel base, and to a method for the continuous production thereof which comprises chromium plating a steel base to form a layer of metallic chromium and a layer of hydrated chromium oxide thereon, tin or tin-nickel alloy plating the chromium plated steel base with a tin or tin-nickel alloy plating solution under acidic condi- tions sufficient to substantially dissolve the hydrat- ed chromium oxide in the solution, thereby removing the hydrated chromium oxide formed during chromium plating, and after rinsing, forming a layer of hydrat- ed chromium oxide on the tin or tin-nickel plated, chromium plated steel base. It is also possible to remove the hydrated chromium oxide formed during chromium plating by a cathodic treatment of the chromium plated steel base in an acidic solution having a pH of 0.5 to 2.0, and thereafter, tin or tin-nickel. alloy plating the chromium plated steel base. The surface treated steel sheet can be used to produce a welded can body at high speed without the removal. of the plated layer in the welded part since it has an excellent weldability.
454343
Fujimoto Terunori
Inui Tsuneo
Ishida Masatoki
Shimizu Nobuyoshi
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
Toyo Kohan Co. Ltd.
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