公开(公告)号：US4971636A

公开(公告)日：1990-11-20

申请号：US369465

申请日：1989-06-21

申请人： Tsutomu Watanabe ,  Masaaki Yamashita ,  Takahiro Kuboto

发明人： Tsutomu Watanabe ,  Masaaki Yamashita ,  Takahiro Kuboto

IPC分类号： C23C22/30 ,  B05D7/00 ,  C23C22/33 ,  C23C22/38 ,  C23C22/83

CPC分类号： B05D7/51 ,  C23C22/38 ,  C23C22/83 ,  B05D2202/10 ,  B05D2350/20 ,  B05D2350/65

摘要： 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 Cr.sup.6+ /Cr.sup.3+ 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 soluble Cr compound to basic epoxy resin.