Abstract
Ni-based composite coatings are considered to improve the oxidation resistance of stainless steel. In this study, Ni–TiO2 composite coatings were electrodeposited onto the AISI 430 stainless steel. The isothermal oxidation of bare steel and steel with Ni–TiO2 coating was performed at 800 °C for 200 h. Moreover, cyclic oxidation of the coated and bare steel was performed up to 50 cycles. The coating layer and oxide scales were investigated by X-ray diffraction and scanning electron microscopy. All the coated specimens showed good oxidation resistance during the oxidation tests. The TiO2 particles in the coating affected the stability of the protective oxide scale. Furthermore, the coated steel showed a lower oxidation rate compared with the bare steel. It is concluded that TiO2 increases oxidation resistance by blocking the outward diffusion of Cr cations.
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