Abstract
In this research a Chromium Carbide (Cr3C2)-based powder consisting of 80% Cr3C2 and 20% Titanium dioxide (TiO2) is sprayed to SA 210 Grade C boiler tube material for better performance of power plant boilers. Cr3C2-TiO2 coating is deposited by high velocity oxygen fuel (HVOF) process with powder particle of size 45 ± 15 μm. High temperature oxidation test under cyclic condition is performed in air environment up to 900 °C. The properties of specimen are characterized by optical microscopy, X-ray diffraction (XRD), scanning electron microscopy with energy dispersive spectroscopy (SEM/EDS). The results shown that the Cr3C2-TiO2 coating exhibit excellent corrosion resistance at 900 °C compared to bare SA 210 Grade C boiler tubes and the coating also reduces the weight gain of the steel by about 50%. High temperature oxidation resistance imparted by Cr3C2-TiO2 coating may be attributed to the formation of alloy phases during the powder processing and coating processes.
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