Tin-free steel strips useful in the manufacture of welded cans a

Details Tin-free steel strips useful in the manufacture of welded cans a Tin-free steel strips useful in the manufacture of welded cans a

1986-03-14

1987-08-18

Rutledge, L. Dewayne

Stock material or miscellaneous articles

All metal or with adjacent metals

Composite; i.e., plural, adjacent, spatially distinct metal...

428666, 428687, 204 41, 204 561, B32B 1504

Patent

active

046877134

ABSTRACT:
A tin-free steel strip comprising a steel strip, 40 to 150 mg/m.sup.2 of a metallic chromium layer on the steel surface, and 5 to 25 mg/m.sup.2 of a chromium compound containing 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, 1.times.10.sup.11 to 1.times.10.sup.14 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 CR.sup.6+ preferably to a weight of 40 to 140 mg/m.sup.2, subjecting the chromium plated strip to anodic electrolysis, preferably at an eectricity quantity of 0.1 to 10 C/dm.sup.2, and subjecting the strip to a cathodic treatment in an aqueous solution containing Cr.sup.6+ and a chromium plating aid so as to deposit additional metallic chromium, preferably in a weight of 10 to 60 mg/m.sup.2.

REFERENCES:
patent: 4432842 (1984-02-01), Inui et al.
Patent Abstracts of Japan, Unexamined Applications, C Field, vol. 9, No. 153, Jun. 27, 1985, Kokai No. 60-29 494, p. 18, C 288, "Production of Tin-Free Steel Having Excellent Paint Adhesion".

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