Abstract
Pure Ni and Ni-CeO2 nanocrystalline coatings were prepared from a Watts-nickel electrolyte using ultrasonic-assisted pulse electro deposition. Effect of incorporating CeO2 addition on their corrosion behavior in a 3.5%NaCl+1.5%HCl (mass fraction) solution was evaluated by elec- trochemical impedance spectroscopy (EIS) and equivalent electric circuits (EECs). Meanwhile, static immersion tests and the analysis of corrosion products were carried out. Experimental results indicated that the existence of CeO2 phase in the Ni coatings promoted an effective dispersion strengthening after aged at 600 for 4 h in air, and also produced a continuous Ce-rich oxide sale acted as the passive layer covered on the coating surface to reduce pinholes or micro cracks that generated from hydro- gen evolution reactions during electrochemical deposition, hence resulting in the decrease of localized
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