In this investigation, a nanostructured NiCr coating was deposited on boiler steel by cold spraying and its oxidation behavior was evaluated under cyclic thermal conditions. Oxidation kinetics were established through weight change measurements and the oxidized samples were characterized using XRD and SEM analysis and X-ray mapping. The nanostructured coating was more than two times harder than its microstructured equivalent and in oxidation tests, reduced the weight gain of the boiler steel by 68%. The coating was found to have protective oxides in its oxide scale and was shown to be spallation-free.

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