Electrolysis: processes – compositions used therein – and methods – Electrolytic coating – Forming multiple superposed electrolytic coatings
Patent
1993-02-22
1994-05-31
Niebling, John
Electrolysis: processes, compositions used therein, and methods
Electrolytic coating
Forming multiple superposed electrolytic coatings
205184, 427433, C25D 500
Patent
active
053166523
ABSTRACT:
A method for manufacturing an iron-zinc alloy plated steel sheet having two plating layers and excellent in electropaintability and press-formability, which comprises the steps of: applying an alloying treatment under a temperature of from 420.degree. to 520.degree. C. to a zinc dip-plated steel sheet to form on the surface of the steel sheet an alloying-treated iron-zinc alloy dip-plating layer having on the surface thereof fine irregularities comprising numerous fine concavities and numerous fine convexities; then applying a temper rolling treatment at a reduction rate of from 0.3 to 1.5 to the alloying-treated steel sheet, to level the numerous fine convexities on the surface of the alloying-treated iron-zinc alloy dip-plating layer, so as to form on the surface of the steel sheet the alloying-treated iron-zinc alloy dip-plating layer as a lower layer having the numerous fine concavities on the surface thereof; and then applying an iron-zinc alloy electroplating treatment to the temper rolling treated steel sheet to form, on the alloying-treated iron-zinc alloy dip-plating layer as the lower layer, an iron-zinc alloy electroplating layer as an upper layer. The above-mentioned iron-zinc alloy electroplating treatment is carried out with an electric current density of from 50 to 150 A/dm.sup. 2 in an acidic electroplating bath containing iron ions and zinc ions, and having a pH value of from 1.0 to 4.0 and a temperature of from 40.degree. to 70.degree. C.
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Abe Masaki
Hiraya Akira
Inagaki Jun-ichi
Morita Masaya
Sagiyama Masaru
Mayekar Kishor
Niebling John
NKK Corporation
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