材料科学
腐蚀
涂层
合金
高温合金
冶金
扫描电子显微镜
复合材料
作者
Farzin Ghadami,M. Davoudabadi,S. Ghadami
出处
期刊:Journal of vacuum science & technology
[American Institute of Physics]
日期:2023-09-05
卷期号:41 (6)
被引量:1
摘要
Normal AlCrFeCoNi and Si-modified AlCrFeCoNi0.5Si high-entropy alloy (HEA) coatings were deposited on a Ni-based superalloy by air plasma spraying technique. Hot corrosion properties of the normal and Si-modified AlCrFeCoNi0.5Si HEA-coated samples were evaluated at 900 °C under the corrosive salt environment containing 45% Na2SO4 and 55% V2O5. The hot corrosion kinetics of both normal and Si-modified coatings were accordingly investigated using mass gain measurements. X-ray diffraction, field emission scanning electron microscopy, and energy dispersive x-ray analysis were used for the microstructural characterizations. The results indicated that the Si-modified AlCrFeCoNi0.5Si HEA coating has a greater resistance to hot corrosion compared with the normal AlCrFeCoNi HEA coating. The results obtained are primarily related to the formation of Si-rich precipitates, which inhibit the outward diffusion and, therefore, reduce the formation of the corrosion products on the AlCrFeCoNi0.5Si HEA coating surface.
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