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Pure tetragonal 10-20-nm-size zirconia-based Ni-P composite coating was developed.The physicochemical and electrochemical characteristics including corrosion resistance of the coating were investigated.The Ni-P-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 Ni-P-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 kΩ./cm2 and low corrosion current density of 3.9 μA/cm2 were achieved due to the effective incorporation of zirconia into the coating.