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| Effect of Nitrate and Galvanic Couple on Crevice Corrosion Behavior of 7075-T651 Al-alloy in Neutral NaCl Solution |
QIAO Ze1, LI Qingquan2, LIU Xiaohang3, LI Yizhou3( ) |
1. Fujian Fuqing Nuclear Power Co., Ltd., Fuqing 350318, China
2. Jiangsu Nuclear Power Co., Ltd., Lianyungang 222042, China
3. School of Materials Science and Engineering, Ocean University of China, Qingdao 266100, China |
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Cite this article:
QIAO Ze, LI Qingquan, LIU Xiaohang, LI Yizhou. Effect of Nitrate and Galvanic Couple on Crevice Corrosion Behavior of 7075-T651 Al-alloy in Neutral NaCl Solution. Journal of Chinese Society for Corrosion and protection, 2024, 44(4): 1047-1054.
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Abstract The effect of the presence of nitrate and galvanic couple on the crevice corrosion behavior of 7075-T651 Al-alloy in 3.5%NaCl solution is investigated by the electrochemical tests and surface analysis techniques. The results indicate that the nitrate as an oxidizing agengt could promote the formation of passive film, so that inhibit the corrosion of the Al-alloy. However, when there is a formed crevice on the Al-alloy in a solution without nitrate, inside the crevice corrosion is hard to occur and develop, in the contrast, in a solution with the presence of nitrate, which could be reduced forming NH3, the later agent may accumulate inside the crevice and selectively dissolve the copper particles, thereby induced the nucleation of pitting corrosion, afterwards, further promoted the propagation of crevice corrosion. After coupling with 304 stainless steel, a large Galvano-corrosion driving force is generated between the electrodes inside and outside the crevice, which accelerates the metal dissolution and solution deterioration process in the crevice, resulting in much more serious crevice corrosion in the solution with nitrate.
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Received: 26 October 2023
32134.14.1005.4537.2023.338
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| Fund: National Natural Science Foundation of China(51901217) |
Corresponding Authors:
LI Yizhou, E-mail: liyizhou@ouc.edu.cn
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