Journal of South China University of Technology(Natural Science Edition) ›› 2011, Vol. 39 ›› Issue (11): 125-131.

• Materials Science & Technology • Previous Articles     Next Articles

Influence of pH Value on Corrosion of Wear-Resistant Casting Alloy Cu-17Ni-3Al-X

Luo Zong-qiang  Xin Bao-liang  Zhang Wei-wen  Li Yuan-yuan   

  1. School of Mechanical and Automotive Engineering,South China University of Technology,Guangzhou 510640,Guangdong,China
  • Received:2011-03-01 Revised:2011-05-11 Online:2011-11-25 Published:2011-10-03
  • Contact: 罗宗强(1966-) ，男，高级工程师，主要从事金属材料制备与成形技术研究． E-mail:mezqluo@ scut.edu． cn
  • About author:罗宗强(1966-) ，男，高级工程师，主要从事金属材料制备与成形技术研究．
  • Supported by:

    教育部新世纪人才支持计划资助项目( NCET-07-0310) ; 广东省经信委技术创新项目( 2010108116)

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Abstract:

The influence of pH value on the corrosion resistance and the corrosion behavior of wear-resistant casting alloy Cu-17Ni-3Al-X in 3. 5% ( mass fraction) NaCl solution was investigated via static immersion test,electrochemical test,SEM,XRD and XPS. The results show that,in 3% NaCl solution,the corrosion rate of the alloy decreases with the increase of pH value,that the alloy is of excellent corrosion resistance in neutral and alkaline
NaCl solution,that no compact protection film forms on the alloy surface when the pH value is 3,that Ni-rich and Al-rich Cu2( OH)3Cl and Cu2O films form on the alloy surface when the pH value is 6,8 and 10,and that compact Cu2O film is easy to form when the pH value is 12. In conclusion,the difference in corrosion rate of the alloy in NaCl solution with different pH values is due to the difference in cathodic reaction and the protection films,and the alloy suffers from intergranular corrosion around the second phases in acid solution.

Key words: pH value, Cu-Ni alloy, corrosion rate, corrosion resistance, corrosion behavior

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