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- W3150274788 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 electrochemical 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 hydrogen evolution reactions during electrochemical deposition,hence resulting in the decrease of localizedcorrosion or intergranular attack by Cl-.Based on the observed results from potentiodynamic polarization curves,they exhibited an obvious passivation transition attached with a reducing corrosion current density by lower than 1.5 orders of magnitude of Ni-CeO2 coatings(600℃) as relative to pure Ni.EIS measurements for pure Ni displayed a high frequency capacitive arc together with a middle-low frequency diffusion arc.While for the Ni-CeO2 coatings,they displayed module of capacitive arc with a wide frequency area of phase angle close to 90° so as to confirm superior anti-corrosion property.During long-term static immersion tests in an acid NaCl solution,a small amount of Ce3+ released from CeO2 phase were served as the corrosion inhibitors by means of making strong adsorption onto the exposed area for increasing corrosion resistance.With the presence of CeO2 addition,slightly uniform corrosion was observed on the surface of Ni-CeO2 coatings as compared to severely pitting corrosion of pure Ni.According to the determination of corrosion products by XRD and XPS,both of their corrosion products were mainly composed of NiCl2 and Ni(OH)2,while some insoluble products of CeCl3 and CeO2 phase generated on the surface of Ni-CeO2 coatings,thereby achieving such insoluble corrosion products covered on pitting holes of localized corrosion to preclude the exposed area from corrosive attack and diffusion behavior by Cl-." @default.
- W3150274788 created "2021-04-13" @default.
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- W3150274788 date "2013-01-01" @default.
- W3150274788 modified "2023-09-23" @default.
- W3150274788 title "CORROSION BEHAVIOR AND EIS STUDY OF NANOCRYSTALLINE Ni-CeO_2 COATINGS IN AN ACID NaCl SOLUTION" @default.
- W3150274788 hasPublicationYear "2013" @default.
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