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Effect of NiO-NiCr2O4 nano-oxides on the microstructural,mechanical and corrosion properties of Ni-coated carbon steel

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International Journal of Minerals,Metallurgy and Materials 2023年第6期30卷 1078-1092页

作者： saeed mojallal Hurieh Mohammadzadeh Abbas Aghaeinejad-Meybodi Robabeh Jafari Materials Engineering Department Faculty of EngineeringUrmia UniversityUrmiaIran Chemical Engineering Department Faculty of EngineeringUrmia UniversityUrmiaIran

Pure Ni and its composites with different percentages of Ni-Cr nano-oxides were coated over carbon steel to assess the coating features and mechanical and corrosion behavior.A nano-oxide composite of Ni-Cr was first synthesized through chemical coprecipitation with uniform distribution *** was employed to coat pure Ni and Ni-(Ni-Cr)oxides(10,20,30,40,and 50 g/L)on the steel *** electron microscope and field emission scanning electron microscope were adopted to examine the microstructure of powders and coatings,and X-ray diffraction analysis was employed to study the chemical *** microhardness,thickness,and wear resistance of the coatings were assessed,polarization and electrochemical impedance spectroscopy(EIS)tests were conducted to analyze the corrosion behavior,and the corresponding equivalent circuit was *** showed flawless and crack-free coatings for all samples and uniform distribution of nano-oxides in the Ni matrix for the samples of 10-30 g/*** oxides were detected at high *** microhardness(HV 661),thickness(116μm),and wear resistance of coatings were found at 30 g/L.A three-loop equivalent circuit corresponded satisfactorily to all EIS *** corrosion resistance increased with the nano-oxide concentration of up to 30 g/L but decreased at 40 g/*** sample of 50 g/L showed the best corrosion resistance.

关键词： nanocomposite powder electroplating coating corrosion resistance electrochemical impedance spectroscopy wear resistance

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