Hot Corrosion Resistance of CeO2-Doped Cr3C2–NiCr Coatings on Austenite Steel Against Molten Salt (Na2SO4–60%V2O5) Environment

被引：0
作者：
Singh H. [1 ]
Chatha S.S. [1 ]
Sidhu B.S. [2 ]
机构：
[1] Yadavindra Department of Engineering, Punjabi University Guru Kashi Campus, Punjab, Talwandi Sabo
[2] Maharaja Ranjit Singh Punjab Technical University, Punjab, Bathinda
来源：
Journal of Bio- and Tribo-Corrosion | 2023年 / 9卷 / 01期
关键词：
Ceria; Cr[!sub]3[!/sub]C[!sub]2[!/sub]–NiCr; Hot corrosion; HVOF; TP347H;
D O I：
10.1007/s40735-022-00723-8
中图分类号：
学科分类号：
摘要：
Three ratios of Ce (0.4 wt.%, 0.8 wt.%, and 1.2 wt.%) were added in Cr3C2–NiCr powder and coated on TP347H steel with HIPOJET-gun for examining the hot corrosion behaviour in Na2SO4–60V2O5 salt at 750 °C. The techniques XRD, SEM/EDS, and X-ray mapping were used to analyse the corrosion products. The current work investigates the coating and oxide scale properties in relation to variable RE content. Moreover, the amount of Cr to develop Cr2O3 is analysed after the addition of CeO2 in the coating. Among the three ratios, 0.4 wt.% of CeO2 in Cr3C2–NiCr provided excellent hot corrosion resistance due to the development of a thin oxide scale composed of Cr2O3, NiCr2O4, Ce2O3, and CeCrO3. From the analysis of corrosion kinetics and microstructure, it has been proposed that the segregation of rare earth (RE) element retards the diffusion of cation (Cr) through Ce2O3 and CeCrO3. However, the hot corrosion protection decreased after the addition of 1.2 wt.% of CeO2 in the Cr3C2–NiCr coating due to increased porosity and inclusions in the oxide scale. The RE-modified HS1, HS3, and HS5 coatings were able to reduce the corrosion rate by 80.34%, 52.05%, and 27.21%, respectively, in comparison with uncoated steel. © 2022, The Author(s), under exclusive licence to Springer Nature Switzerland AG.
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