C - Chemistry – Metallurgy – 23 – C
Patent
C - Chemistry, Metallurgy
23
C
C23C 22/03 (2006.01) B05D 7/00 (2006.01) C08G 18/58 (2006.01) C09D 175/04 (2006.01) C23C 22/04 (2006.01) C23C 22/38 (2006.01) C23C 22/83 (2006.01) C23C 28/00 (2006.01)
Patent
CA 2054878
The present invention provides a method for producing a highly corrosion resistant organic composite-plated steel sheet which is inhibited from liberation of chromium, which comprises forming a coating type chromate film comprising a composition of the following [A] as a first layer at a coating amount of 5-150 mg/m2 as a solid film on the surface of a zinc or zinc alloy plated or zinc composite alloy plated steel sheet and then, coating on the first layer an organic solvent type coating composition of the following [B] as a second layer at a thickness of 0.3 - 5 µm as a solid film. [A] coating type chromate bath composition: ? Cr6+: 1-30 g/l, ? Cr3+: 1-30 g/l, ? Cr6+/Cr3+ weight ratio: 0.2-2.0, ? HF+H3PO4: 1-60 g/l, ? HF+H3PO4/Cr3+ weight ratio: 0.5-3.5, and ? silane coupling agent/Cr6+ molar ratio: 0.05- 0.3 [B] organic solvent type coating composition: (A) a bisphenol type epoxy resin having a number-average molecular weight of 300-100,000 in an amount of 30% by weight or more based on the solid content of the coating composition; (B) at least one curing agent selected from the group consisting of polyisocyanate compounds and blocked polyisocyanate compounds at 1/10 - 20/10 in a weight ratio to solid content of the epoxy resin; (C) fumed silica of 0.1 - 100 mµ in an average particle size in an amount of 5-50% by weight based on the solid content of the coating composition; (D) a ketone type organic solvent in an amount of 40% by weight or more based on the weight of the coating composition; and the solid content of the coating composition being in the range of 10-50% by weight.
Kabeya Motoo
Shindou Yoshio
Yamazaki Fumio
Gowling Lafleur Henderson Llp
Nippon Steel Corporation
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