发明授权
- 专利标题: Chromating method of zinc-based plated steel sheet
- 专利标题(中): 基于镀锌钢板的镀铬方法
-
申请号: US770022申请日: 1991-10-02
-
公开(公告)号: US5230750A公开(公告)日: 1993-07-27
- 发明人: Yoshio Shindou , Motoo Kabeya , Shiro Fujii , Makoto Yoshida , Teruaki Izaki , Takao Ogino , Arata Suda , Takayuki Aoki
- 申请人: Yoshio Shindou , Motoo Kabeya , Shiro Fujii , Makoto Yoshida , Teruaki Izaki , Takao Ogino , Arata Suda , Takayuki Aoki
- 申请人地址: JPX Tokyo
- 专利权人: Nihon Parkerizing Co., Ltd.
- 当前专利权人: Nihon Parkerizing Co., Ltd.
- 当前专利权人地址: JPX Tokyo
- 优先权: JPX2-268041 19901005
- 主分类号: C23C22/38
- IPC分类号: C23C22/38
摘要:
A chromating liquid for forming a chromate film on a Zn or Zn-alloy plated steel sheet, is prepared by adding and mixing a silane coupling agent in a molar ratio of from 0.05 to 0.3 relative to Cr.sup.6+ contained in an aqueous chromating liquid which contains 1-30 g/l of Cr.sup.6+ and 1-30 g/l of Cr.sup.3+ at a weight ratio of Cr.sup.6+ /Cr.sup.3+ ranging from 0.1 to 2.0; and further contains 1-59 g/l of hydrofluoric acid and 1-59 g/l of phosphoric acid at total of hydrofluoric acid and phosphoric acid ranging from 2 to 60 g/l and at a weight ratio of (fluoride ions+phosphate ions)/Cr.sup.3+ ranging from 0.5 to 3.5. and, further said chromating liquid is applied on a surface of the zinc-based plated steel sheet and is then dried, thereby forming the chromate film having a coating amount of from 10 to 150 mg/m.sup.2 in terms of the chromium.
公开/授权文献
- US5740717A Blister package scoring machine 公开/授权日:1998-04-21