Oxidation Study of Ni-W Alloy Matrix Coating Reinforced with Multiple Dissimilar Nanoparticles

초록

A pulsed electrodeposition was performed on mild steel surfaces to prepare Ni-W-based composite coatings consisting of TiO2 and ZrO2 oxide nanoparticles. To evaluate the oxidative properties of coatings, isothermal oxidation studies were performed on the coatings at 873, 973, and 1073 K in the air for 30 h. The coatings' phase evolution, morphology, and chemistry were investigated by x-ray diffraction, field emission scanning electron microscopy, and energy-dispersive spectroscopy, respectively. As a result of examining the microstructure changes after the oxidation test, it was found that the oxide formation increased according to the oxidation temperature. To determine the oxidation kinetics of the respective coatings, Arrhenius plots were drawn and activation energies were calculated. The final results confirmed that the oxidation resistance of the Ni-W-TiO2-ZrO2 nanocomposite coatings (NiWNC) increased with the addition of ZrO2 (0 -15 g/L). In this study, better oxidation resistance was observed for the Ni-W-5 g/L TiO2-15 g/L ZrO2 nanocomposites compared to the rest of the coatings. These findings highlight the potential of producing highly oxidation-resistant coatings using a cost-effective method on commercially available metal surfaces such as mild steels.

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