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Ni60 coatings with the CeO 2  mass fractions of 3%, 6%, and 9% were prepared on S355 steel. The microstructure and phases of obtained coatings were analyzed using an ultradepth of field microscope (UDFM) and X–ray diffraction (XRD), respectively. The effects of CeO 2  mass fraction on the immersion corrosion behaviors and electrochemical performances of Ni60–CeO 2  coatings in 5% NaCl solution were investigated. The results show that the immersion corrosion rates of Ni60–3%CeO 2 , –6%CeO 2  and –9%CeO 2  coatings are 37.1, 24.3 and 49.2 μm/year, respectively, in which the immersion corrosion resistance of Ni60–6%CeO 2  coating is the best among the three kinds of coatings. The polarization resistances of Ni60–3%CeO 2 , –6%CeO 2 , and –9%CeO 2  coatings are 169,867, 228,568, and 51,276 Ω⋅cm 2 , respectively, and the corresponding charge transfer resistances are 2.66 × 10 5 , 6.68 × 10 5 , and 6.40 × 10 5  Ω⋅cm 2 , respectively, showing that the Ni60–6%CeO 2  coating presents the best electrochemical corrosion resistance in 5% NaCl solution.

Immersion corrosion behavior and electrochemical performance of laser cladded Ni60–CeO 2 coatings in 5% NaCl solution