Surface Microstructure Characterization and Corrosion Behavior of Al7Si0.5Mg Aluminum Alloy After Shot Peening Treatment
QIN Chuanguang1, JIANG Bo1,*, LIU Naizhi2, WANG Ye1, HU Maoliang1, XU Hongyu1, JI Zesheng1,3, SHANG Jinchi4
1 School of Materials Science and Chemical Engineering, Harbin University of Science and Technology, Harbin 150080, China 2 School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China 3 Harbin Jixing Mechanical Engineering Co., Ltd., Harbin 150060, China 4 Shandong Jinma Automotive Equipment Technology Co., Ltd., Linyi 276016, Shandong, China
Abstract: The effects of different shot peening speeds on corrosion resistance of Al7Si0.5Mg aluminum alloy were investigated in this work. The shot peened alloy specimens were subjected to electrochemical test and immersion corrosion in 3.5%NaCl solution. The phase composition, surface morphology, deformed layer and corrosion products of the corroded alloy were characterized by XRD, SEM, ultra-deep microscope and EBSD. The results show that after shot peening, obvious plastic deformation layer and submicron grain appear on the surface of the alloy. The maximum thickness of the deformation layer is 20 μm when the shot peening speed is 50 m/s. The icorr of the untreated sample was 64.628 μA/cm2, and the radius of the capacitor arc was the minimum. While the icorr of the sample treated with a shot peening speed of 50 m/s is 16.094 μA/cm2 and the radius of the capacitor arc is maximum. Immersion in 3.5%NaCl solution for 480 h, the sample treated with a shot peening speed of 50 m/s shows a relatively shallow corrosion pit, showing relatively excellent corrosion resistance.
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2025, Vol. 39 
