镁合金表面制备耐腐蚀性钝化膜的无铬处理液及其使用方法

Non-chromium treatment fluid for preparation of corrosion-resistant oxidation film on magnesium alloy surface and method of use thereof

  • Inventors: CHEN DONGCHU
  • Assignees: 陈东初
  • Publication Date: July 23, 2008
  • Publication Number: CN-101225517-A

Abstract

The invention discloses a preparation and application method for conversion liquid of a corrosion resistant oxide film on magnesium alloy surface, which is characterized in that: the conversion liquid adopts rare-earth-containing salt, permanganate, persulphate, nitrate and perchlorate as composite oxidant, zirconium salt, vanadic salt and strontium salt as film forming promoter, boric acid, aminoacetic acid-hydrochloric acid solution as pH buffer regulator, pyridine, thiourea and derivatives, tannins, phytic acid and the salt compound as corrosion inhibitor, sodium dodecyl benzene sulfonate and dodecyl phenol polyoxyethlene ether (OP-10) as wetting agent; the conversion liquid is free from hexavalent chromium and environment-friendly; heating is not required for chemical conversion treatment, and the treatment time is 1 to 5min; composite oxide film with good corrosion resistance performance comprising rare-earth composite oxide, magnesia and manganese oxide can be rapidly prepared at on magnesium alloy surface at ambient temperature. The preparation method for conversion liquid of a corrosion resistant oxide film on magnesium alloy surface has the advantages of fast film forming, simple process, uniform film, strong corrosion resistance and less environmental pollution.
本发明公开了一种镁合金表面制备耐腐蚀性复合氧化膜的转化液及其使用方法,其特征在于,所述转化液为利用含稀土盐,高锰酸根与过硫酸盐、硝酸盐、高氯酸盐等复合氧化剂,锆盐、钒盐与锶盐的成膜促进剂,硼酸、氨基乙酸-盐酸溶液pH缓冲调节剂,吡啶、硫脲及衍生物、单宁酸、植酸及其盐化合物的缓蚀剂,以及十二烷基苯磺酸钠、十二烷基酚聚氧乙烯醚(OP-10)润湿剂,转化液不含六价铬具有环境友好性;化学转化处理无需加热,处理时间为1~5min,可在镁合金表面室温下快速制备出耐腐蚀性能良好的复合稀土氧化物、氧化镁与氧化锰组成的复合氧化膜。本发明处理液具有成膜速度快、工艺简单、膜层均匀、耐腐蚀性强、对环境污染少等优点。

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