Stock material or miscellaneous articles – All metal or with adjacent metals – Composite; i.e. – plural – adjacent – spatially distinct metal...
Patent
1984-05-14
1986-12-16
Rutledge, L. Dewayne
Stock material or miscellaneous articles
All metal or with adjacent metals
Composite; i.e., plural, adjacent, spatially distinct metal...
204 442, 204 447, 428681, B32B 1500
Patent
active
046296590
ABSTRACT:
Highly corrosion resistant plated steel strips or sheets adapted for phosphate treatment and cathodic electrodeposition and intended for use in automobiles, are produced by electroplating at least one surface of a steel strip with an alloy consisting essentially of 0.0003 to 15% by weight of phosphorous, balance essentially iron, in a plating bath containing Fe.sup.2+ ions in an amount of from 0.3 mol/liter to the solubility limit and hypophosphorous acid and/or a hypophosphite in an amount of 0.001 to 25 g/liter expressed as NaH.sub.2 PO.sub.2.H.sub.2 O at a pH of 1.0 to 5.0, a temperature of 30.degree. to 60.degree. C., and a current density of from more than 20 to 200 A/dm.sup.2, preferably 40 to 150 A/dm.sup.2. A top coat can be applied thereover, of one element selected from the group consisting of Ni, Zn, Mn, and Ti, deposited on the Fe-P plating layer to a build-up of 5 to 50 mg/m.sup.2. A lower layer of zinc or a zinc alloy can also be electrodeposited on at least one surface of the steel strip, prior to formation of the Fe-P layer. A surface film can be formed by chemically treating the Fe-P plating layer with a phosphate.
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Metals Handbook Ninth Edition, vol. 5, "Surface Cleaning, Finishing, and Coating", American Society for Metals, 1982. p. 323.
Irie Toshio
Kimura Hajime
Kurokawa Shigeo
Kyono Kazuaki
Kawasaki Steel Corporation
McDowell Robert L.
Rutledge L. Dewayne
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