Pure tetragonal 10-20-nm-size zirconia-based NiP composite coating was developed. The physicochemical and electrochemical characteristics including corrosion resistance of the coating were investigated. The NiP -nano-tetragonal zirconia coating was partially crystalline having face-centered cubic phase. The coating had very high corrosion resistance due to its dense compact morphology and low surface roughness. The NiP -nano-tetragonal zirconia coatings exhibited a cathodic shift of open-circuit potential (OCP) in the range from-0.340 to-0.520 V. A high polarization resistance of the order of 13.2 kX/cm 2 and low corrosion current density of 3.9 lA/cm 2 were achieved due to the effective incorporation of zirconia into the coating.
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