C - Chemistry – Metallurgy – 25 – D
Patent
C - Chemistry, Metallurgy
25
D
204/22
C25D 5/48 (2006.01) C25D 3/22 (2006.01) C25D 11/38 (2006.01)
Patent
CA 1058551
ABSTRACT OF THE DISCLOSURE A steel sheet is subjected to an electro-galvanizing treatment in a Zn-ion based acidic galvanizing bath containing one additive selected from the group consisting of: (a) Cr3+ ........................ 50 - 700 ppm, (b) Cr6+ ........................ 50 - 500 ppm, and (c) Cr3+ and Cr6+ ............... 50 - 700 ppm, in which Cr6+ being 500 ppm at the maximum; and at least one additive selected from the group consisting of: (d) Sn ion ...................... 10 - 5,000 ppm, and (e) In ion ...................... 10 - 3,000 ppm. Then the electro-galvanized steel sheet is subjected to a conventional chromate treatment. By this procedure, the adaptability of the electro- galvanized steel to chromating is improved.
243817
Adaniya Takeshi
Ohmura Masaru
LandOfFree
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