Journal of South China University of Technology (Natural Science Edition) ›› 2014, Vol. 42 ›› Issue (10): 7-13.doi: 10.3969/j.issn.1000-565X.2014.10.002

• Materials Science & Technology • Previous Articles     Next Articles

Influence of Additives on Morphology and Performance of Colored Ti-Zr Conversion Coating at Room Temperature

Zuo Xi  Li Wen-fang  Mu Song-lin   

  1. School of Material Science and Engineering,South China University of Technology,Guangzhou 510640,Guangdong,china
  • Received:2013-12-24 Revised:2014-05-14 Online:2014-10-25 Published:2014-10-01
  • Contact: 李文芳（1964-），男，教授，博士生导师，主要从事材料表面工程研究。 E-mail:newfl@scut.edu.cn
  • About author:左茜（1986-），女，博士生，主要从事材料表面工程研究.E-mail:zuo.q@scut.edu.cn
  • Supported by:

    广东省重大科技专项（产业共性技术）基金资助项目（2009A08025002）

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Abstract:

In this paper,two additives including vanadate and organic were added in the mixed Ti-Zr solution ,and the effects of these additives on the behaviors of Ti-Zr conversion coating were investigated.Then,the micrographic structure and thickness of the coating were analyzed by using an optical microscope and eddy current thickness meter,respectively,and the corrosion resistance of the coating was discussed by dropping corrosion test,Tafel polarization curves and electrochemical spectroscopy(EIS).The results indicate that,with the coordination effect of vanadate and organic,Ti-Zr conversion coating can be prepared at room temperature with a time consumption of only 30s,the thickness,anti-corrosion time,corrosion current density and impedance of the coating are respectively 4,3,1/6,and 3 times that of the coating without any additives.It is thus concluded that the optical corrosion resistance of conversion coating was prepared by added the two additives simultaneously into Ti-Zr solution.

Key words: aluminum alloy, Ti-Zr conversion coating, additives, corrosion resistance

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