Chemistry: electrical and wave energy – Processes and products
Patent
1983-05-26
1986-04-01
Niebling, John F.
Chemistry: electrical and wave energy
Processes and products
204 321, 204 351, 204 40, C25D 548, C25D 1138
Patent
active
045796335
ABSTRACT:
Tin-free steel sheets having intimately bonded metallic chromium and hydrated chromium oxide coatings thereon and possessing improved resistance to retorting treatment and improved adhesion to paint films to be applied thereon are produced by chromium plating a steel sheet in a chromium plating bath containing an assistant to deposit and form metallic chromium and hydrated chromium oxide coatings on the sheet surface, subjecting the sheet to reverse electrolysis in the same chromium plating bath to partially dissolve away the metallic chromium and hydrated chromium oxide coatings together with the assistant anions codeposited in the hydrated chromium oxide coating, rinsing the sheet with water, and thereafter subjecting the sheet to an electrolytic chromate treatment in an electrolytic chromate treating bath.
REFERENCES:
patent: 3642587 (1972-02-01), Allen et al.
patent: 3772165 (1973-11-01), Yamagishi et al.
patent: 3890164 (1975-06-01), Harada et al.
patent: 3986940 (1976-10-01), Takano et al.
patent: 4432842 (1984-02-01), Inui et al.
Hamada Motoharu
Harada Shun'ichi
Kobayashi Hideo
Ogata Hajime
Tsugawa Shunichi
Kawasaki Steel Corporation
Leader William T.
Niebling John F.
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