In this study, Ni-20Cr alloy powder was synthesized and deposited on T22 boiler steel by HVOF spraying. Coated and uncoated test samples were placed in a silicon carbide tube furnace and subjected to cyclic oxidation conditions in 900 °C air. Oxidation kinetics were established via weight change measurements and oxidation products were characterized based on XRD and SEM-EDS analysis. The results show that in addition to improving the oxidation resistance of the steel, the Ni-20Cr coatings also reduced spallation due to the formation of a protective Cr2O3 phase.

cyclic oxidation testing, HVOF spraying, Ni-20Cr powder, oxidation resistance, T22 boiler steel, weight-change measurements
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2013
ASM International
Topics
Chromium-molybdenum steel Alloy powder Nickel-chromium alloys High-velocity oxyfuel spray coating Oxidation resistance Accelerated corrosion testing
Issue Section:
Applications and Case Studies
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