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| Hot Corrosion Behavior of a Low-Re Second-generation Single Crystal Superalloy |
YANG Xin1, CHE Xin1( ), LU Yuzhang2, HUANG Yaqi2, WANG Dong2, SHEN Jian2() |
1.School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870, China
2.High-Temperature Structural Materials Research Department, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China |
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Cite this article:
YANG Xin, CHE Xin, LU Yuzhang, HUANG Yaqi, WANG Dong, SHEN Jian. Hot Corrosion Behavior of a Low-Re Second-generation Single Crystal Superalloy. Journal of Chinese Society for Corrosion and protection, 2026, 46(4): 1159-1168.
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Abstract Nickel-based single-crystal superalloys are extensively applied in aero-engines due to their superior high-temperature performance. However, in coastal and marine environments, they are highly susceptible to hot corrosion induced by Na2SO4 and NaCl deposits. Previous studies have revealed that mixed salts accelerate the degradation of protective oxide scale and intensify the internal corrosion, thus significantly reducing the service life of alloy components. Nevertheless, systematic investigations on the hot corrosion behavior of low-Re second-generation single-crystal superalloys in different salt environments remain scarce, and the underlying mechanisms require further clarification. Therefore, the hot corrosion behavior of a low-Re second-generation single-crystal superalloy at 900 ℃ beneath deposits of pure Na2SO4 and mixed Na2SO4/NaCl salts in air was investigated using the discontinuous weight change measurement method. Results show that the Na2SO4/NaCl mixed salt exhibits more severe corrosive effect, manifested by intensified oxide scale spallation, increased corrosion products thickness, and aggravated internal corrosion. Beneath the pure Na2SO4 salt deposit, a relatively continuous Al2O3 protective oxide scale is formed on the alloy surface, whereas beneath the mixed salt, the synergistic action of Cl- and S- triggers a chlorination-oxidation cycle and sulfidation reactions, which compromise the oxide scale integrity and accelerate the deterioration of the alloy.
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Received: 21 August 2025
32134.14.1005.4537.2025.262
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Corresponding Authors:
CHE Xin, E-mail: xiaoxin2004068@163.comSHEN JIAN, E-mail: shenjian@imr.ac.cn
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