Microstructure and Corrosion Behavior of Friction Stir-Welded 6061 Al/AZ31 Mg Joints with a Zr Interlayer
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School of Mechanical Engineering, Hebei University of Technology, Tianjin 300130, China
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Patent Examination Cooperation (Tianjin) Center of the Patent Office, CNIPA, Tianjin 300304, China
3
School of Chemical Engineering and Technology, Hebei University of Technology, Tianjin 300130, China
*
Authors to whom correspondence should be addressed.
Materials 2019, 12(7), 1115; https://doi.org/10.3390/ma12071115
Received: 17 March 2019
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Revised: 30 March 2019
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Accepted: 1 April 2019
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Published: 3 April 2019
(This article belongs to the Section Corrosion)
Friction stir welding (FSW) with a Zr interlayer was employed to join dissimilar alloys of 6061 Al and AZ31 Mg. The microstructures of Al/Mg and Al/Zr/Mg joints were investigated by optical microscopy (OM), scanning electron microscopy (SEM), and energy dispersive X-ray spectrometer (EDS). The results showed that the central part of the Zr interlayer was smashed and intermixed with the base materials in the stir zone, whereas the undamaged part remained stable at the Al/Mg interface. The formation of Al–Mg intermetallic compounds (IMCs) was suppressed by the Zr interlayer due to its synergetic effects of chemical modification and thermal barrier. The electrochemical measurements revealed a differentiated corrosion behavior for each joint, where the corrosion rate of representative regions increased in the order of Al alloy < Mg alloy < heat-affected zone < stir zone. The immersion tests indicated an enhancement in corrosion resistance for the Al/Zr/Mg joint compared with the Al/Mg joint, which is owing to the mitigated galvanic corrosion between the base materials by the Zr interlayer.
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MDPI and ACS Style
Zheng, Y.; Pan, X.; Ma, Y.; Liu, S.; Zang, L.; Chen, Y. Microstructure and Corrosion Behavior of Friction Stir-Welded 6061 Al/AZ31 Mg Joints with a Zr Interlayer. Materials 2019, 12, 1115. https://doi.org/10.3390/ma12071115
AMA Style
Zheng Y, Pan X, Ma Y, Liu S, Zang L, Chen Y. Microstructure and Corrosion Behavior of Friction Stir-Welded 6061 Al/AZ31 Mg Joints with a Zr Interlayer. Materials. 2019; 12(7):1115. https://doi.org/10.3390/ma12071115
Chicago/Turabian StyleZheng, Yang, Xiaomeng Pan, Yinglei Ma, Shuming Liu, Libin Zang, and Yong Chen. 2019. "Microstructure and Corrosion Behavior of Friction Stir-Welded 6061 Al/AZ31 Mg Joints with a Zr Interlayer" Materials 12, no. 7: 1115. https://doi.org/10.3390/ma12071115
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