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| Effect of Cyclic Strengthening on Corrosion Behavior of 7075 Al-alloy |
CHEN Yuqiang1, RAN Guanglin1, LU Dingding1( ), HUANG Lei2, ZENG Liying2, LIU Yang1, ZHI Qian1 |
1 School of Materials Science and Engineering, Hunan University of Science and Technology, Xiangtan 411201, China
2 Xiangtan Industrial and Mining Electric Transmission Vehicle Quality Inspection Center, Xiangtan 411200, China |
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Cite this article:
CHEN Yuqiang, RAN Guanglin, LU Dingding, HUANG Lei, ZENG Liying, LIU Yang, ZHI Qian. Effect of Cyclic Strengthening on Corrosion Behavior of 7075 Al-alloy. Journal of Chinese Society for Corrosion and protection, 2025, 45(4): 1051-1060.
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Abstract 7075 Al-alloy suffered often from corrosion damages during service in coastal area environments, due to seawater splash or salt atmosphere corrosion. Therefore, for the problem of high strength but poor corrosion resistance of 7075 Al-alloy, a cyclic strengthening (CS) process at ambient temperature is adopted to improve its strength and corrosion resistance. Compared with the traditional peak aging T6, the cyclic strengthening treated 7075 Al-alloy shows better corrosion resistance with higher free-corrosion potential and higher impedance value in electrochemical test. In NaCl solution, the intergranular corrosion depth of the T6 treated alloy was 58 μm, while that of the CS treated one was only 15 μm. The corrosion pits and corrosion microcracks formed for the CS alloy are smaller than that of the T6 ones in salt spray corrosion test. The corrosion products of both T6 and CS alloy contain Zn(OH)2 and ZnCl2, the formation of which is due to the electrochemical reaction between the η′(MgZn2) phase at the grain boundaries of the T6 alloy, and the clusters of atoms in the CS alloy and the Al-matrix, respectively. After the CS process, a large number of dislocations and clusters of atoms are generated within the 7075 Al-alloy, which hinders the dislocation movement and increases the free-corrosion potential, thereby improving the strength and corrosion resistance of the 7075 Al-alloy.
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Received: 05 September 2024
32134.14.1005.4537.2024.287
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| Fund: Natural Science Foundation of Hunan Province(2023JJ10019) |
Corresponding Authors:
LU Dingding, E-mail: ludingding@hnust.edu.cn
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