Hot Corrosion Behaviors of CoCrFeNiTi0.5 High Entropy Alloy in the Mixture Salt of Na2SO4-25%K2SO4 and Na2SO4-25%NaCl at 750°C
Advances in Materials
Volume 8, Issue 3, September 2019, Pages: 120-126
Received: Aug. 7, 2019; Accepted: Aug. 28, 2019; Published: Sep. 10, 2019
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Li Ping, College of Materials Science and Engineering, Dalian University of Technology, Dalian, China
Zhao Jie, College of Materials Science and Engineering, Dalian University of Technology, Dalian, China
Li Tingju, College of Materials Science and Engineering, Dalian University of Technology, Dalian, China
Pang Shengjiao, College of Materials Science and Engineering, Dalian University of Technology, Dalian, China
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Hot corrosion behaviors of CoCrFeNiTi0.5 high entropy alloy pre-coated various mixture salt in air at 750°C were investigated respectively by using weight change kinetics, X-ray analyses, SEM equipped with EDS and EPMA. The results indicate that CoCrFeNiT0.5 alloy exhibits relatively high corrosion resistance in Na2SO4-25%K2SO4 molten salts. The cross-section is divided into three parts: the oxide scale composed of various oxides, the corrosion affected zones with some micro-pores as well as minor of sulfides and the matrix. The addition of NaCl to Na2SO4 destroys seriously the integrity and compactness of the oxide scale and induces the formation of more micro-pores as well as sulfides in the corrosion affected zone, which accelerates the propagation of hot corrosion. As a result, the alloy suffers from more severe corrosion in Na2SO4-25% NaCl than in Na2SO4-25%K2SO4. Hot corrosion of the alloy in Na2SO4-25%K2SO4 is explained based on the oxidation and the basic fluxing of Cr2O3 in molten Na2SO4. However, hot corrosion process in Na2SO4-25% NaCl is dominated by the interaction of oxidation and chlorination. In addition, the internal sulfidation of Fe and Ni also contributes to hot corrosion of the alloy in both Na2SO4-25%K2SO4 and Na2SO4-25% NaCl mixture salt.
High Entropy Alloys (HEAs), Alkali Metal Sulfate, Low Melting Point Eutectic, Sulfidation, Chlorination
To cite this article
Li Ping, Zhao Jie, Li Tingju, Pang Shengjiao, Hot Corrosion Behaviors of CoCrFeNiTi0.5 High Entropy Alloy in the Mixture Salt of Na2SO4-25%K2SO4 and Na2SO4-25%NaCl at 750°C, Advances in Materials. Vol. 8, No. 3, 2019, pp. 120-126. doi: 10.11648/
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