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| Intergranular Corrosion Behavior of Friction-stir Welding Joint for 20 mm Thick Plate of 7075 Al-alloy |
Deqiang LIU1,2,Liming KE1,3( ),Weiping XU1,Li XING1,Yuqing MAO3 |
1 School of Aeronautical Manufacturing and Engineering, Nanchang Hangkong University, Nanchang 330063, China
2 Jiangling Holdings Co., Ltd., Nanchang 330052, China
3 State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China |
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Abstract The intergranular corrosion behavior of friction-stir welding (FSW) joint for 20 mm thick plate of 7075 Al-alloy was investigated in solution of 57 g NaCl+1000 mL H2O+10 mL H2O2 corresponding to the national standard GBT7998-2005. The microstructure of welded joint, the composition and distribution of the second phase, corrosion depth and corrosion morphology of different zones of the weld joint were characterized by optical microscope and scanning electron microscope. The results show that the corrosion severity of the center zones of the weld joint is the lightest. The corrosion severity of the thermal mechanical affected zone (TMAZ) is between that of the center zones and heat affected zone (HAZ). Downward along the thickness direction of the weld joint, the corrosion severity of the nugget zone (NZ) gradually increased, while that of the TMAZ increased first and then decreased, and that of the HAZ gradually decreased. The difference in the size and the distribution of the second phase and in the grains size of the weld joint along the thickness direction may be the main factor which caused the different corrosion severity for different zones along the thickness direction of the weld joint.
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Received: 09 March 2016
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| Fund: Supported by National Natural Science Foundation of China (51265043 and 51364037) and Aviation Science Foundation Projects (20140956003) |
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