Journal of South China University of Technology (Natural Science Edition) ›› 2017, Vol. 45 ›› Issue (6): 124-130.doi: 10.3969/j.issn.1000-565X.2017.06.019

• Chemistry & Chemical Engineering • Previous Articles     Next Articles

Electrochemical Corrosion Behaviors of Titanium Alloy in Different Solutions

HE Ya-feng1,2 LU Wen-zhuang1 GAN Wei-min2,3   

  1. 1.Jiangsu Key Laboratory of Precision and Micro-Manufacturing Technology,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,Jiangsu,China; 2.Digital Electrochemical Machining Key Laboratory of Jiangsu Province,Changzhou 213002,Jiangsu,China; 3.Department of Mechanics and Vehicle,Changzhou Institute of Technology,Changzhou 213002,Jiangsu,China
  • Received:2016-03-11 Revised:2016-08-14 Online:2017-06-25 Published:2017-05-02
  • Contact: 卢文壮(1972-)，男，教授，博士生导师，主要从事现代加工技术研究． E-mail:meewzlu@nuaa.edu.cn
  • About author:何亚峰(1975-)，男，博士生，副教授，主要从事电解加工技术研究．E-mail:460465979@qq．com
  • Supported by:

    Supported by the Natural Science Foundation of JiangSu Province(BK20161193)and the Key University Science Research Project of JiangSu Province(15KJA460002)

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Abstract:

In this paper,first,the electrochemical corrosion behaviors of titanium alloy Ti6Al4V were investigated in such different solutions as NaCl,NaBr and KBr at various mass fractions (6. 5%,12. 5% and 18. 5%),and the corresponding corrosion polarization curves and dynamic parameters were obtained.Then,the electrochemical corrosion mechanism of titanium alloy was explored by means of SEM.Finally，the fractal feature of corrosion pits was obtained by means of the pixel-covering fractal dimension method,and the relationship between the corrosion sur- face topography and the fractal was revealed.The results show that (1) different from the titanium alloy in NaBr and KBr solutions,the titanium alloy in NaCl solution possesses wider activation range and longer oxidation dissolution time; (2) the corrosivity of titanium alloy in NaBr solution is stronger than that in NaCl and KBr solutions at the same mass fraction; and (3) the fractal dimension of titanium alloy in the three kinds of solutions gra-dually changes with the increase of mass fraction; for instance,the fractal dimension in NaBr solution is the most，which results in the most complex topography,while that in NaCl solution is the least,which results in a relatively flat topography.

Key words: titanium alloy, electrochemical corrosion, polarization curve, fractal dimension