Electrolysis: processes – compositions used therein – and methods – Electrolytic coating – Depositing predominantly single metal coating
Patent
1991-02-19
1993-04-20
Niebling, John
Electrolysis: processes, compositions used therein, and methods
Electrolytic coating
Depositing predominantly single metal coating
205306, 205311, C25D 322
Patent
active
052039862
ABSTRACT:
A method for manufacturing an electrogalvanized steel sheet excellent in spot weldability, which comprises the steps of: adding, into an acidic electrogalvanizing solution containing an oxidizer, a complexing agent, which is capable of forming a stable complex with zinc, in an amount within a range of from 0.001 to 10 moles per liter of the electrogalvanizing solution, or a pH buffer, which has a pH buffering effect in a solution having a pH value within a range of from 5 to 12, in an amount within a range of from 1 to 50 g per liter of the electrogalvanizing solution; and electrogalvanizing a steel sheet in the resultant acidic electrogalvanizing solution containing the complexing agent or the pH buffer in addition to the oxidizer, to form a galvanizing layer comprising zinc oxide or zinc hydroxide on the surface of the steel sheet.
REFERENCES:
patent: 3887445 (1975-06-01), Jackson
patent: 3972788 (1976-08-01), Passal
patent: 4877497 (1989-10-01), Watanabe et al.
patent: 4957594 (1990-09-01), Yamazaki et al.
Patent Abstracts of Japan, vol. 13, No. 510 (C-654)[3858], Nov. 15, 1989, for JP-A-2 05 090 (Nippon Steel Corp.) Aug. 17, 1989, Japan.
Abe Masaki
Shiohara Yukimitsu
Bolan Brian M.
Niebling John
NKK Corporation
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