吉林大学学报(工学版) ›› 2016, Vol. 46 ›› Issue (2): 511-515.doi: 10.13229/j.cnki.jdxbgxb201602027

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Effect of micro-arc oxidation treatment on corrosion resistance of aluminum friction stir welding welds

YANG Yue1, 2, ZHOU Lei-lei1, 2   

  1. 1.School of Materials Science and Engineering, Changchun University of Technology, Changchun 130012, China;
    2.Key Laboratory of Advanced Structural Materials, Ministry of Education, Changchun University of Technology, Changchun 130012, China
  • Received:2014-06-25 Online:2016-02-20 Published:2016-02-20

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Abstract: The ceramic coating fabricated by micro-arc oxidation at different current density is employed to improve the corrosion resistance of Friction Stir Welding (FSW) welds on aluminum alloy. The morphology and phase composition of the coating were investigated by Scanning Electron Microscopy (SEM) and X-ray Diffraction (XRD). The surface roughness of the coating was characterized by Confocal Laser Scanning Microscopy (CLSM). The corrosion properties of the FSW welds before and after micro-arc oxidation were analyzed by Electrochemical Impedance Spectroscopy (EIS) and polarization curve (LSV). Results show that the thickness of the ceramic coating layer increases with the current density and it becomes more difficult to break down the coating. Once the coating is broken down a lot of melts will form and the surface roughness increases. Furthermore, the ceramic coating produced at current density of 10 A/m2 shows better wear resistance than the others.

Key words: material surface and interface, aluminum alloy, weld, micro-arc oxidation, corrosion resistance

CLC Number: 

  • TG146
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