Effect of Temperature and Impurity Content to Control Corrosion of 316 Stainless Steel in Molten KCl-MgCl(2) Salt

The corrosion resistance of 316 stainless steel (316SS) in molten KCl-MgCl(2) 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 ra...

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Detalles Bibliográficos
Autores principales: Li, Na, Wang, Huaiyou, Yin, Huiqin, Liu, Qi, Tang, Zhongfeng
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2023
Materias:
Article
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10004461/
https://www.ncbi.nlm.nih.gov/pubmed/36903140
http://dx.doi.org/10.3390/ma16052025
Descripción
Sumario:The corrosion resistance of 316 stainless steel (316SS) in molten KCl-MgCl(2) 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(2) 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(2) 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.

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