Abstract
Abstract In the present study, Cr3C2-NiCr and Cr2O3 coatings were deposited on ASTMSA213 T11 boiler steel by Detonation Gun thermal spray process with the objective to check the corrosion resistance of coatings on the steel. High and moderate temperature behavior was investigated for the uncoated as well as coated boiler steel in the simulated boiler environment for 50 cycles at 900 °C and at 530 °C in air environment. Characterization of corrosion products in oxide scale was done using SEM/EDS. XRD and X-ray mapping for surface and cross sectional analysis. The uncoated steel sample suffered the degradation in the form of intense spalling in air environment at high temperature. Cr2O3 specimen also suffered intense degradation in air environment at high temperature and surface coating of Cr2O3 specimen has totally detached from the substrate after 5 cycles. Cr2O3 coating at moderate temperature in air environment has shown moderate spalling. Cr3C2-NiCr coating show better corrosion resistance in air environment at both temperatures and show least weight gain in all situations. Comparatively, better performance of Cr3C2-NiCr coating has been observed by virtue of formation of protective oxides phases.
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