Journal
CORROSION SCIENCE
Volume 205, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2022.110454
Keywords
Molten salts; Ceramic; EPMA; High temperature corrosion
Funding
- National Key Research and Development Program [2017YFA0402803]
- National Natural Science Foundation of China [52071331]
- Chinese Academy of Sciences [XDA02004210, XDA21000000]
- Transformational Technologies for Clean Energy and Demonstration, Strategic Priority Research Program of the Chinese Academy of Sciences [XDA21000000]
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The effect of 316 stainless steel on the corrosion of pressureless-sintered SiC in the vapor of molten NaCl-KCl-MgCl2 salt at 700 degrees C was studied. It was found that MgCl2•xH2O (x = 4, 6) hydrolyzed into HCl, which caused corrosion of the stainless steel. Some corrosion products dissolved and increased the concentration of elements Cr, Fe, and Ni in the salt, while others reacted with SiC to form Cr7C3, Fe3Si, and SiCl4. Reactions among SiC, stainless steel, and their corrosion products (FeCl2, CrCl2, and SiCl4) led to a corrosion depth of approximately 250 μm for 1000 hours.
The effect of 316 stainless steel on the corrosion of pressureless-sintered SiC in the vapor of molten NaCl-KClMgCl2 salt at 700 degrees C was investigated. Results indicate that MgCl2 center dot xH(2)O (x = 4, 6) was hydrolyzed to form HCl which corroded the stainless steel. Some corrosion products were dissolved to increase the concentration of elements Cr, Fe, and Ni in salt, and others reacted with SiC to form Cr7C3, Fe3Si, and SiCl4. Reactions among SiC, stainless steel, and their corrosion products (FeCl2, CrCl2 and SiCl4) drove the corrosion of SiC with a depth of similar to 250 mu m for 1000 h.
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