发明授权
US4957568A Composition and process for activating metal surfaces prior to zinc
phosphating and process for making said composition
失效
在锌磷化之前活化金属表面的组合物和方法以及用于制备所述组合物的方法
- 专利标题: Composition and process for activating metal surfaces prior to zinc phosphating and process for making said composition
- 专利标题(中): 在锌磷化之前活化金属表面的组合物和方法以及用于制备所述组合物的方法
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申请号: US345063申请日: 1989-04-28
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公开(公告)号: US4957568A公开(公告)日: 1990-09-18
- 发明人: Helmut Endres , Peter Christophliemk , Karl-Dieter Brands , Wolf-Achim Roland , Joerg Riesop
- 申请人: Helmut Endres , Peter Christophliemk , Karl-Dieter Brands , Wolf-Achim Roland , Joerg Riesop
- 申请人地址: DEX Duesseldorf
- 专利权人: Henkel Kommanditgesellschaft auf Aktien
- 当前专利权人: Henkel Kommanditgesellschaft auf Aktien
- 当前专利权人地址: DEX Duesseldorf
- 优先权: DEX3814287 19880428
- 主分类号: C01B25/38
- IPC分类号: C01B25/38 ; C01B25/40 ; C23C22/80
摘要:
Activation of metal surfaces prior to phosphating can be improved by using aqueous dispersions of polymeric titanium(IV) phosphates in which at least 95% by weight of the polymeric particles have a particle diameter of less than 200 nm. This low particle diameter is attained by adding a titanium(IV)-complexing agent before or during an otherwise conventional reaction between a titanium(IV) compound, acid or phosphate, and water. The complexing agent is used in an amount of less than the stoichiometric amount, based on the titanium(IV) content. The best complexing agents are poly(aldehydocarboxylic acids), 1,1-diphosphonic acids, and/or the alkali metal salts of these types of acids.
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