Corrosion Behavior of Joints of Mg-alloy AZ31 Fabricated by Friction Stir Welding

doi:10.11902/1005.4537.2016.003

Journal of Chinese Society for Corrosion and protection

2017, Vol. 37

Issue (2): 117-125 DOI: 10.11902/1005.4537.2016.003

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Corrosion Behavior of Joints of Mg-alloy AZ31 Fabricated by Friction Stir Welding

Ziyang ZHANG,Shanlin WANG(

),Hengyu ZHANG,Liming KE

National Defence Key Disciplines Laboratory of Light Alloy Processing Science and Technology, Nanchang Hangkong University, Nanchang 330063, China

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Abstract

Weld joints of Mg-alloy AZ31 were prepared by friction stir welding, and then their corrosion behavior was assessed in NaCl solution. The results show that the free corrosion potential of the friction stir weld joint of Mg-alloy AZ31 is like that of the base metal; however, the corrosion current density of the base metal was 0.45 mAcm^-2, while it was 1.63 mAcm^-2 for the joint. Moreover, the corrosion resistance in weld nugget zone was the worst because of the effect of the grain size and the distribution of β phase, and the corrosion initialed in this region. In the initial corrosion stage, the corrosion resistance of the base metal was superior to that of the weld joint, but later the base metal exhibited faster corrosion rate rather than the weld joint, which may be ascribed to the occurrence of passivation of the weld joint.

Key words: AZ31 magnesium alloy friction stir welding corrosion behavior corrosion rate

Received: 05 January 2016

Fund: Supported by National Natural Science Foundation of China (51461031), State Key Laboratory of New Metal Materials (2013-Z05) and National Key Laboratory of Light Alloy Processing Science and Technology (gf201501005)

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	Ziyang ZHANG
	Shanlin WANG
	Hengyu ZHANG
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Cite this article:

Ziyang ZHANG,Shanlin WANG,Hengyu ZHANG,Liming KE. Corrosion Behavior of Joints of Mg-alloy AZ31 Fabricated by Friction Stir Welding. Journal of Chinese Society for Corrosion and protection, 2017, 37(2): 117-125.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2016.003 OR https://www.jcscp.org/EN/Y2017/V37/I2/117

Fig.1 Appearance of welding head

Fig.2 Cross-sectional microstructures of FSW joint of AZ31 magnesium alloy: (a) parent material area, (b) heat affected zone, (c) thermal mechanical affected zone, (d) weld zone

Fig.3 Variations of corrosion rate of FSW joint of AZ31 magnesium alloy in NaCl solutions with immersion time

Fig.4 Corrosion morphologies of welded joint after immersion in 1.5% (a), 3.5% (b), 5.5% (c) and 7.5% (d) NaCl solutions for 10 min

Fig.5 Corrosion morphologies of welded joint after immersion in 1.5% (a), 3.5% (b), 5.5% (c) and 7.5% (d) NaCl solutions for 1 h

Fig.6 Corrosion morphologies of welded joint after immersion in 1.5% (a), 3.5% (b), 5.5% (c) and 7.5% (d) NaCl solutions for 24 h

Fig.7 Corrosion morphologies of welded joint after immersion in 1.5% (a), 3.5% (b), 5.5% (c) and 7.5% (d) NaCl solutions for 96 h

Fig.8 SEM images (a, b) and EDS analysis results (c, d) of sediments formed on the surface of the joint after immersion in 3.5%NaCl solution for 24 h (a, c) and 96 (b, d)

Fig.9 Corrosion morphologies of the cross section of the joint after immersion in 3.5%NaCl solution for 3 min (a), 10 min (b), 1 h (c) and 96 h (d)

Fig.10 Corrosion morphologies of the cross section of the joint after immersion in 3.5%NaCl solution for 1 h: (a) parent material area, (b) weld zone, (c) heat affected zone, (d) thermal mechanical affected zone

Fig.11 XRD patterns of base material zone (a) and FSW seam area (b) of AZ31 magnesium alloy

Fig.12 Dynamic potential scanning Tafel polarizationcurves of FSW seam area

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