C - Chemistry – Metallurgy – 25 – D
Patent
C - Chemistry, Metallurgy
25
D
204/25.5
C25D 5/14 (2006.01) C25D 9/00 (2006.01) C25D 11/38 (2006.01)
Patent
CA 1272159
ABSTRACT OF THE DISCLOSURE A tin-free steel strip comprising a steel strip, 40 to 150 mg/m2 of a metallic chromium layer on the steel surface, and 5 to 25 mg/m2 of a non-metallic chromium layer thereon wherein the metallic chromium layer contains a plurality of protrusions, exhibits improved corrosion resistance and weldability and is thus useful in the manufacture of welded cans. Preferably, 1X1011 to 1x1014 protrusions having a diameter of 5 to 1000 nm at the base thereof are present per square meter of the metallic chromium layer surface. The tin-free steel strip is produced by chromium plating a steel strip in an aqueous solution containing Cr6+ preferably to a weight of 40 to 140 mg/m2, subjecting the chromium plated strip to anodic electrolysis, preferably at an electricity quantity of 0.1 to 10 C/dm2, and subjecting the strip to a cathodic treatment in an aqueous solution containing Cr6+ and a chromium plating aid so as to deposit additional metallic chromium, preferably in a weight of 10 to 60 mg/m2.
504147
Akeda Yasuhiro
Ichida Toshio
Irie Toshio
Nakajouki Hisatada
Ogata Hajime
Kawasaki Steel Corporation
Moffat & Co.
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