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Corrosion Behavior of Friction Stir Welded Al-Mg-(Zn) Alloys
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State Key Laboratory for Advanced Metals and Materials,University of Science and Technology Beijing,State Key Laboratory for Advanced Metals and Materials,University of Science and Technology Beijing,State Key Laboratory for Advanced Metals and Materials,University of Science and Technology Beijing,State Key Laboratory for Advanced Metals and Materials,University of Science and Technology Beijing,Shandong Provincial Key Laboratory of Special Welding,Harbin Institute of Technology at Weihai,State Key Laboratory for Advanced Metals and Materials,University of Science and Technology Beijing

Fund Project:

The National Natural Science Foundation of China (General Program, Key Program, Major Research Plan);The National Science Fund for Distinguished Young Scholars;Beijing Laboratory of Metallic Materials and Processing for Modern Transportation, China; State Key Lab of Advanced Metals and Materials, China

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    Abstract:

    The corrosion behavior of friction stir welded Zn-modified Al-Mg alloys are systematically investigated as well as the effects of pre-weld temper conditions on the corrosion behavior of the friction stir welded alloys. Both maximum corrosion depth and dominating corrosion mode in different weld regions after post welding heat treatment show obvious variations with an increase in the Zn content. With Zn additions the dominating corrosion mode changes from intergranular corrosion to pitting corrosion, and the severe galvanic corrosion tendency obviously occurs in the precipitation hardened alloys compared to that of the strain hardened alloy. This would be greatly related with the formation of discontinuously distributed grain boundary precipitates as well as abundant intragranular precipitates (mainly T-AlZnMgCu phase) in the precipitation hardened Al-Mg-Zn alloys while it is in line with the continuously distributed β-AlMg phase along grain boundary in the Zn-free Al-Mg alloys.

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[Longgang Hou, Jiajia Yu, Di Zhang, Linzhong Zhuang, Li Zhou, Jishan Zhang. Corrosion Behavior of Friction Stir Welded Al-Mg-(Zn) Alloys[J]. Rare Metal Materials and Engineering,2017,46(9):2437~2444.]
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History
  • Received:June 20,2016
  • Revised:September 11,2017
  • Adopted:February 23,2017
  • Online: November 29,2017

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