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In this study, we developed Nb₂O₅-Ni composite coatings on carbon steel by DC sputtering technique. The effect of Nb₂O₅ particulate on the Ni coating properties was investigated. The weight percents of Nb₂O₅ in Ni coating were 0, 12, 15, and 30 wt%. The structural properties of the composite coatings were characterized using scanning electron microscope equipped with energy-dispersive spectrometer. The microhardness and thickness of composite coatings were measured, in addition to examine the corrosion properties in 3.5% NaCl using MLab 200 potentiostat/galvanostat with linear polarization technique. The results showed that hardness value increased to 164 HV for 30 wt% Niobia compared with 155 HV for Ni coating and the thickness increased slightly for Nb₂O₅-Ni composite coatings. The corrosion performance improved to obtain efficiencies better than Ni coating alone.