Effects of Heat Straightening on Intergranular Corrosion of Al-Zn-Mg Alloy
Published: 2023-12-15
Page: 902-912
Issue: 2023 - Volume 6 [Issue 4]
Shuai Li *
School of Mechanical Engineering, North China University of Water Resources and Electric Power, Zhengzhou 450045, China and School of Mechanical Engineering, North China University of Water Resources and Electric Power, Zhengzhou 450045, China.
Jiyuan Ding
School of Mechanical Engineering, North China University of Water Resources and Electric Power, Zhengzhou 450045, China.
Dejun Yan
CSSC Huangpu Wenchong shipbuilding Company Limited, Guangzhou 510715, China.
Guoshun Yang
Aerospace Engineering Equipment (Suzhou) Co. Ltd., Suzhou 215004, China.
Rongzheng Xu
Shenyang Aerospace University, Guangzhou 110136, China.
Chuanqing Liao
Shanghai Aerospace Equipments Manufactureer Co., Ltd., Shanghai 200245, China.
Tingting Wu
School of Mechanical Engineering, North China University of Water Resources and Electric Power, Zhengzhou 450045, China.
Yonggang Jiang
CSSC Huangpu Wenchong shipbuilding Company Limited, Guangzhou 510715, China.
*Author to whom correspondence should be addressed.
Abstract
The present study aimed to investigate the corrosion resistance of Al-Zn-Mg alloy under different times of heat straightening, utilizing the intergranular corrosion (IGC) and electrochemical testing. The results indicated a decrease in the IGC resistance of the Al-Zn-Mg alloy as a result of heat straightening. The maximum intergranular corrosion depth of 105 μm was obtained after one time of heat straightening. The discussion on the IGC behavior was centered on changes in precipitation at the grain boundaries and within the matrix. As the heat straightening times increased, the precipitate-free zone (PFZ) disappeared, and the precipitate phases underwent dissolution and re-precipitation. Notably, the sample after one time of heat straightening exhibited the most severe corrosion among the specimens, which was attributed to the higher precipitation coverage rate at the grain boundaries.
Keywords: Heat straightening, intergranular corrosion, electrochemical testing, Al-Zn-Mg alloys