Method of producing highly corrosion-resistant...

Details Method of producing highly corrosion-resistant... Method of producing highly corrosion-resistant...

C - Chemistry, Metallurgy

23

C

117/113, 148/18,

C23C 22/24 (2006.01) B05D 7/00 (2006.01) C23C 22/38 (2006.01) C23C 22/82 (2006.01) C23C 22/83 (2006.01)

Patent

CA 1333030

The present invention is to provide a method of producing highly corrosion-resistant surface-treated steel plates where Cr elusion is small in spite of drying at low temperatures and corrosion resistance is excellent. In a process for producing surface treated steels where Zn type plated steels are treated through (i) chromate treatment, (ii) coating a resin composition and (iii) baking treatment, zirconium fluoride ion and Zn ion of appropriate amounts are added into the chromate bath, and Cr6+/Cr3+ ratio in the bath is controlled to be low. Further the resin composition to be coated after the chromate treatment is rendered a solvent type resin composition obtained by adding silica and/or sparingly water solubel Cr compound to basic epoxy resin.

603769

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