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Characterization of Oxide Scales on Super-Alloy HR120 at 1000 °C in Air and Steam Environments

机译:在空气和蒸汽环境中1000℃的超合金HR120上的氧化物鳞片的表征

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摘要

Oxidation resistance of super-alloy HR120 in air and steam environments at 1000 °C was investigated. Scanning electric microscopy and X-ray diffraction analysis were used to characterize the corrosion products. The results show that weight gain in steam was much higher than that in air. Oxide scales formed in air were MnCr2O4 and Cr2O3, whereas oxides developed in steam were NiFe2O4, (Cr, Fe)2O3 and little internal Cr-Si oxides. Steam can increase the corrosion rate and fine the oxides formed on the sample's surface. Moreover, enhanced oxidation of HR120 in steam was mainly attributed to the evaporation of chromium oxyhydroxides.
机译:研究了1000℃的空气和蒸汽环境中超合金HR120的氧化抗性。扫描电显微镜和X射线衍射分析用于表征腐蚀产物。结果表明,蒸汽的体重增加远高于空气中的重量增益。在空气中形成的氧化物鳞片是MnCr2O4和Cr2O3,而在蒸汽中产生的氧化物是NiFe2O4,(Cr,Fe)2O3和小的内部Cr-Si氧化物。蒸汽可以增加腐蚀速率并细细,在样品表面上形成的氧化物。此外,蒸汽中HR120的增强氧化主要归因于羟基氧化铬的蒸发。

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