公开(公告)号：US07422629B1

公开(公告)日：2008-09-09

申请号：US09914701

申请日：2000-03-02

申请人： Jun Kawaguchi ,  Kazuhiro Ishikura ,  Tomoyuki Manmi

发明人： Jun Kawaguchi ,  Kazuhiro Ishikura ,  Tomoyuki Manmi

IPC分类号： C25D9/04 ,  C23C22/07 ,  C23C22/12 ,  C23C22/13 ,  C25D9/10 ,  C23C22/06

CPC分类号： C25D11/36

摘要： Electrolysis using a suitable electrolyte provides a completely nonsludging zinc phosphate conversion coating process that produces a high quality conversion coating in a very short time. The suitable electrolyte contains at least water, dissolved nitric acid, and dissolved zinc cations and optionally also contains m chemically distinct species of cations other than zinc and n chemically distinct species of anions other than anions derivable by ionization of phosphoric and nitric acids, each of m and n independently being zero or a positive integer. Preferably, the liquid composition contains as additive at least one selection from nitrous acid, permanganic acid, peroxysulfuric acid, hydrogen peroxide, chloric acid, perchloric acid, nitrobenzenesulfonic acid, hydroxylamine, starch/phosphoric acid esters, fluorine compounds, and salts of the preceding; and/or the metal substrate is subjected to cathodic electrolysis after the workpiece has been brought into contact with a weakly basic aqueous colloidal solution that contains titanium oxide, titanium hydroxide, and zinc phosphate.

摘要翻译： 使用合适的电解质的电解提供了完全不含磷酸锌的转化涂层方法，其在非常短的时间内产生高质量的转化涂层。 合适的电解质至少包含水，溶解的硝酸和溶解的锌阳离子，并且任选地还含有不同于锌的化学不同种类的阳离子和除了通过电离磷酸和硝酸可得到的阴离子以外的化学不同种类的阴离子， m和n独立地为零或正整数。 优选地，液体组合物含有来自亚硝酸，高锰酸，过氧硫酸，过氧化氢，氯酸，高氯酸，硝基苯磺酸，羟胺，淀粉/磷酸酯，氟化合物和前述的盐的至少一种添加剂 ; 和/或金属基板在与含有氧化钛，氢氧化钛和磷酸锌的弱碱性水性胶体溶液接触后进行阴极电解。