Li Na, Wang Huaiyou, Yin Huiqin, Liu Qi, Tang Zhongfeng
Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China.
University of Chinese Academy of Sciences, Beijing 100049, China.
Materials (Basel). 2023 Feb 28;16(5):2025. doi: 10.3390/ma16052025.
The corrosion resistance of 316 stainless steel (316SS) in molten KCl-MgCl salts was studied through static immersion corrosion at high temperatures. Below 600 °C, the corrosion rate of 316SS increased slowly with increasing temperature. When the salt temperature rises to 700 °C, the corrosion rate of 316SS increases dramatically. The corrosion of 316SS is mainly due to the selective dissolution of Cr and Fe at high temperatures. The impurities in molten KCl-MgCl salts could accelerate the dissolution of Cr and Fe atoms in the grain boundary of 316SS, and purification treatment can reduce the corrosivity of KCl-MgCl salts. Under the experimental conditions, the diffusion rate of Cr/Fe in 316SS changed more with temperature than the reaction rate of salt impurities with Cr/Fe.
通过高温静态浸泡腐蚀研究了316不锈钢（316SS）在熔融KCl-MgCl盐中的耐腐蚀性。在600℃以下，316SS的腐蚀速率随温度升高而缓慢增加。当盐温升至700℃时，316SS的腐蚀速率急剧增加。316SS的腐蚀主要是由于高温下Cr和Fe的选择性溶解。熔融KCl-MgCl盐中的杂质会加速316SS晶界处Cr和Fe原子的溶解，而净化处理可以降低KCl-MgCl盐的腐蚀性。在实验条件下，316SS中Cr/Fe的扩散速率随温度变化比盐杂质与Cr/Fe的反应速率变化更大。
