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| Synergistic Inhibition Effect of Thiourea and Sodium Nitrate on Crevice Corrosion of 7075 Al-alloy in Acidic Sodium Chloride Solution |
LYU Zhengping, LI Yuan, LIU Xiaohang, CUI Zhongyu, CUI Hongzhi, WANG Xin, PANG Kun( ), LI Yizhou() |
| School of Materials Science and Engineering, Ocean University of China, Qingdao 266100, China |
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Cite this article:
LYU Zhengping, LI Yuan, LIU Xiaohang, CUI Zhongyu, CUI Hongzhi, WANG Xin, PANG Kun, LI Yizhou. Synergistic Inhibition Effect of Thiourea and Sodium Nitrate on Crevice Corrosion of 7075 Al-alloy in Acidic Sodium Chloride Solution. Journal of Chinese Society for Corrosion and protection, 2023, 43(6): 1367-1374.
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Abstract The effect of NaNO3 and TU on the crevice corrosion of 7075 Al-alloy were investigated by mass loss measurements, electrochemical tests and scanning electron microscopy (SEM) in acidic sodium chloride solution. NaNO3 and TU show a certain inhibited effect on the corrosion of Al-alloy, respectively. Moreover, NaNO3 and TU could inhibit synergistically the corrosion of aluminum alloy. For the specimen with crevice, NaNO3 could inhibit the corrosion of specimen outside crevice. However, it could promote the corrosion of specimen inside crevice. It could be attributed to that the produced NH3 inside crevice due to the reduction of nitrate could selectively dissolve the intermetallic particles and induce the nucleation of pitting corrosion inside crevice. In the solution containing TU, the specimen inside crevice is hardly corroded, however, the specimen outside crevice is still seriously corroded. In the solution with NaNO3 and TU, the TU could adsorb on metal surface and inhibit the pitting corrosion inside crevice, while the NaNO3 could promote the formation passive film and inhibit the corrosion of specimen outside crevice.
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Received: 21 November 2022
32134.14.1005.4537.2022.365
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| Fund: National Natural Science of Foundation of China(51901217) |
Corresponding Authors:
LI Yizhou, E-mail: liyizhou@ouc.edu.cn;
PANG Kun, E-mail: pangkun@ouc.edu.cn
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