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- W4200391917 abstract "Herein the electrochemical corrosion behavior of pre- and post-heat-treated composite coatings of NiCrMoFeCoAl-30%SiO2 and NiCrMoFeCoAl-30%Cr2O3 on ASTM SA213-T22 boiler tube steel by a high-velocity oxygen fuel (HVOF) spraying technique are reported. The samples were subjected to hot molten salt (Na2SO4–60%V2O5) corrosion environment in a tubular furnace at 700°C under thermocyclic conditions. The microscopic, structural, and electrochemical investigations of post-heat-treated specimens reveal NiCrMoFeCoAl-30%Cr2O3 composite HVOF coating exhibits a superior corrosion resistance compared to NiCrMoFeCoAl-30%SiO2 composite coating and bare ASTM SA213-T22 steel boiler tube steel in neutral electrolyte. The room-temperature potentiodynamic and impedance investigations of heat-treated samples suggest high interfacial charge transfer resistance for HVOF coatings over a wide anodic potential window. This could be ascribed to the protective nature of the chromium-oxide-containing coatings on high-temperature treatment. AC impedance analysis reveals NiCrMoFeCoAl-30%Cr2O3 coating exhibits very high resistive behavior with very high charge transfer resistance, in the order of 106 Ω higher than the NiCrMoFeCoAl-30%SiO2 coating and uncoated ASTM SA213-T22 steel boiler tube steel. Furthermore, the high-temperature-induced formation of metal chromates/chromites along with the presence of Cr2O3 provides good resistance toward corrosion." @default.
- W4200391917 created "2021-12-31" @default.
- W4200391917 creator A5009898065 @default.
- W4200391917 date "2021-12-28" @default.
- W4200391917 modified "2023-09-24" @default.
- W4200391917 title "Electrochemical Corrosion Behavior of Heat Treated HVOF Coatings on ASTM SA213-T22 steel" @default.
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- W4200391917 doi "https://doi.org/10.5006/3957" @default.
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