Hot corrosion behavior and mechanism of FGH96 P/M superalloy in molten NaCl–Na2SO4 salts
来源期刊：Rare Metals2019年第2期
论文作者：He Jiang Jian-Xin Dong Mai-Cang Zhang Lei Zheng Zhi-Hao Yao
文章页码：173 - 180
摘 要：Hot corrosion behavior of FGH96 powder metallurgy（P/M） superalloy in 25 % NaCl + 75 % Na2SO4 molten salts at 650, 700, and 750 ℃ was investigated in this paper. The methods of mass loss measurement, X-ray diffraction（XRD）, scanning electron microscopy（SEM）,and energy-dispersive spectroscopy（EDS） were used here.The experimental results show that hot corrosion kinetics follows a square power law at 650 ℃, while a linear one at 700 and 750 ℃. The corrosion layer is detected to be composed of Cr2O3, NiO, and Ni2S3 at each temperature.The cross-sectional morphologies and corresponding elemental maps indicate that the corrosion layer is a stratified structure of oxide and sulfide. The results and analyses confirm that the hot corrosion mechanism of FGH96 P/M superalloy is a cooperate process of oxidation and sulfidation. Furthermore, the relatively higher concentrations of Cr, Co, and Ti provide better corrosion resistance to the attack of S and Cl-.
He Jiang，Jian-Xin Dong，Mai-Cang Zhang，Lei Zheng，Zhi-Hao Yao
Materials Science and Engineering, University of Science and Technology Beijing
摘 要：Hot corrosion behavior of FGH96 powder metallurgy（P/M） superalloy in 25 % NaCl + 75 % Na2SO4 molten salts at 650, 700, and 750 ℃ was investigated in this paper. The methods of mass loss measurement, X-ray diffraction（XRD）, scanning electron microscopy（SEM）,and energy-dispersive spectroscopy（EDS） were used here.The experimental results show that hot corrosion kinetics follows a square power law at 650 ℃, while a linear one at 700 and 750 ℃. The corrosion layer is detected to be composed of Cr2O3, NiO, and Ni2S3 at each temperature.The cross-sectional morphologies and corresponding elemental maps indicate that the corrosion layer is a stratified structure of oxide and sulfide. The results and analyses confirm that the hot corrosion mechanism of FGH96 P/M superalloy is a cooperate process of oxidation and sulfidation. Furthermore, the relatively higher concentrations of Cr, Co, and Ti provide better corrosion resistance to the attack of S and Cl-.
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