C - Chemistry – Metallurgy – 25 – D
Patent
C - Chemistry, Metallurgy
25
D
204/25.5
C25D 3/22 (2006.01) C25D 5/48 (2006.01)
Patent
CA 1059061
ABSTRACT OF THE DISCLOSURE An improvement is provided in a process for manufacturing an electro-galvanized steel sheet excellent in bare corrosion resistance and adaptability to chromating, wherein a steel sheet is subjected to an electro-galvanizing treatment in an acidic galvanizing bath containing Co ion. The improvement comprises subjecting the steel sheet to an electro-galvanizing treatment in a Zn-ion acidic galvanizing bath containing at least one additive selected from the group consisting of: Image in order to form a first galvanizing layer on the surface thereof. The electro-galvanized steel sheet with said first galvanizing layer formed thereon to a conventional chromate treatment. With a view further to increase the amount of deposited chromate on that chromated electro-galvanized steel sheet, the electro- galvanized steel sheet with the first galvanizing layer formed thereon is subjected to another electro-galvanizing treatment in a conventional acidic galvanizing bath containing zinc only in order to form a second galvanizing layer consisting exclusively of a-t least 0.2 g/m2 zinc on said first galvanizing layer. Then the electro-galvanized steel sheet with the first and the second galvanizing layers formed thereon is subjected to a conventional chromate treatment.
243818
Adaniya Takeshi
Ohmura Massaru
LandOfFree
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