Surface-treated steel strips adapted for electric resistance wel

Details Surface-treated steel strips adapted for electric resistance wel Surface-treated steel strips adapted for electric resistance wel

1985-06-05

1986-08-26

O'Keefe, Veronica

Stock material or miscellaneous articles

All metal or with adjacent metals

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

428632, 428633, 428666, 428667, 428678, 428679, 428681, 428682, C25D 536

Patent

active

046083200

ABSTRACT:
Surface-treated steel strips suitable for electric resistance welding are prepared by forming a first layer of iron-nickel alloy on a steel strip, said first layer having a weight ratio of Ni/(Fe+Ni) in the range between 0.02 and 0.50 and a thickness of 10 to 5,000 angstroms, forming a second layer of tin or iron-tin-nickel alloy on said first layer by tin plating to a coating weight of 0.1 to 1 g/m.sup.2 of tin and optionally, causing the tin to reflow, and forming a third layer on said second layer by effecting an electrolytic chromate treatment, said third layer consisting essentially of metallic chromium and hydrated chromium oxide in a total amount of 5 to 20 mg/m.sup.2 calculated as elemental chromium. More preferably, the electrolytic chromate treatment is controlled such that at least 2 mg/m.sup.2 of metallic chromium is present in the third layer.

REFERENCES:
patent: 4501802 (1985-02-01), Higuchi et al.

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