Metal oxides have a wide industrial application and are an important component of engineered nanocomposites that can improve the surface properties of metals by applying them to a variety of substrates through coating methods. In the present study, the Ni-Cr nano-oxide (NiO/NiCr2O4) was synthesized by co-precipitation to increase the durability of St12 carbon steel in harsh environments against corrosive and abrasive materials. Subsequently, the surface of St12 carbon steel sheets was coated by electrophoretic deposition (EPD) at 110V-3min. The properties of the synthesized nanocomposite and coatings were investigated by XRD, FTIR, FESEM and optical microscope (OM). The results showed that NiO and NiCr2O4 form nanoscale deposits with a crystallite size of 28.8nm and an average particle size of 60-80nm. The wear and corrosion behavior of the St12 substrate and coatings was investigated using ball-on-disk wear, EIS and polarization tests. XRD analysis of the coating materials after sintering revealed Ni, NiCr2O4 and phases of NiAl2O4 and Al formed during sintering as a result of Al addition. The results showed that the Ni-Cr oxide nanocomposite was successfully deposited on the St12 surface by EPD. The average coating thickness was measured to be 10.76 µm. The improvement in wear behavior was determined by measuring 1.8 and 2.1 mg mass of worn material for the coated sample and substrate, respectively. According to the Tafel analysis, the corrosion current density (icorr) was 10.3 and 140.3 µA.cm−2 for the prepared coating and substrate, respectively, showing the considerable evolution of the corrosion behavior of bare steel by adding coatings up to 13 times. The electrochemical impedance spectroscopy (EIS) data were used to evaluate the corrosion mechanism and simulate the corresponding electrical equilibrium circuit. The charge transfer resistance (Rct) was 7934.6 and 134.49 Ω for the coated sample and the bare St12 substrate, respectively.