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Influence of CeO2 nanoparticles on the corrosion behavior of electrodeposited Ni coatings

K. M. Aswathi, Liju Elias, A. Chitharanjan Hegde

Abstract


Nickel-Ceria (Ni-CeO2) nanocomposite coatings were developed on mild steel (MS) substrate using electrodeposition method. The codeposition of the nanoparticles was achieved from the optimized Ni plating bath loaded with CeO2 nanoparticles (particle size <20 nm). Ni and Ni-CeO2 coatings were achieved at a wide current density (c.d.) range from 1.0 to 5.0 A/dm2 under optimal conditions, and their corrosion protection efficacy was examined in 5% NaCl medium. The material property of Ni coatings towards corrosion was found to be enhanced by the incorporation of the distributed phase, CeO2 nanoparticles, into the Ni matrix. Potentiodynamic polarization, electrochemical impedance spectroscopy (EIS) techniques were used to examine the corrosion behaviors of metal and nanocomposite coatings. The obtained results showed an improvement in corrosion resistance for Ni-CeO2 coatings compared with Ni, and the nanocomposite coating obtained at 4.0 A/dm2 was found to be optimal with least corrosion rate (CR = 1.8  102 mm/y). The coatings have been characterized using diverse instrumental methodologies such as SEM, EDS and XRD study, and results are discussed.

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