Zn-Ni alloy-plated steel sheet with improved impact adhesion

Details Zn-Ni alloy-plated steel sheet with improved impact adhesion Zn-Ni alloy-plated steel sheet with improved impact adhesion

1989-07-06

1990-07-10

McDowell, Robert

Stock material or miscellaneous articles

All metal or with adjacent metals

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

428658, 428679, 428935, B32B 1501, B32B 1518

Patent

active

049406396

ABSTRACT:
A Zn-Ni alloy electroplated steel sheet exhibiting improved corrosion resistance as well as improved adhesion upon impact and resistance to powdering and a manufacturing process therefor are disclosed. The electroplated steel sheet comprises a steel sheet; a thin Zn-Ni alloy electroplated underlayer on at least one side of the steel sheet in which microcracks having a width of 0.01-0.5 .mu.m and covering 10-60% of the surface area of the electrolplated layer are randomly oriented; and a Zn-Ni alloy electroplated toplayer. The underlayer is prepared by dipping the initially electroplated sheet into an acidic solution containing 20 g/l or more of Ni.sup.2+ and 20 g/l or more of Zn.sup.2+ with a ratio of Ni.sup.2+ /Zn.sup.2+ of 1.0.about.4.0 at a bath temperature of 40.about.70.degree. C. for a period of time (T, seconds) of (5.about.20) .times.W (W: weight of electroplated layer in g/m.sup.2) without applying an electric current to form an Ni-rich pretreated underlayer.

REFERENCES:
patent: 4159230 (1979-06-01), Barnes et al.
patent: 4411961 (1983-10-01), Tremmel

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