C - Chemistry – Metallurgy – 25 – D
Patent
C - Chemistry, Metallurgy
25
D
204/24
C25D 9/10 (2006.01) C25D 3/22 (2006.01) C25D 5/10 (2006.01)
Patent
CA 2036843
METHOD FOR MANUFACTURING ELECTROGALVANIZED STEEL SHEET EXCELLENT IN SPOT WELDABILITY ABSTRACT OF THE DISCLOSURE A method for manufacturing an electrogalvanized steel sheet excellent in spot weldability, which comprises the steps of: adding, into an acidic electro- galvanizing 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 litre 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 litre 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.
Abe Masaki
Shiohara Yukimitsu
Abe Masaki
Macrae & Co.
Nkk Corporation
Shiohara Yukimitsu
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