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Hossein Hassannejad,Ashkan Nouri,Mohammad Hossein Assari,Seyed Hani Mirfalah,Mansour Bozorg 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.3
In this study, the coating of Ni–Ni3Si nanocomposite was produced in-situ on plain carbon steel using spark plasma sinteringprocess of Ni and Si powders followed by heat treatment. Increasing Si content in the powders from 6 to 13 wt% increasedthe amount of Si in the coatings (from 5.1 to 11.8 wt%). The corrosion behavior of the coated samples in 1 M sulfuric acidsolution was investigated by potentiodynamic polarization and electrochemical impedance spectroscopy techniques. In the 13wt% Si coating, the eutectic structure consisting of the Ni and Ni3Siphases was observed to be uniformly distributed. Ni3Sinanoparticles with an approximate size of 90 nm were obtained in the coating by heat treatment. The results showed thatpassive behavior is obtained by heat treatment due to the uniform distribution of Ni3Sinanoparticles and also the uniformdiffusion of silicon into the nickel phase. The excellent passivation results in the highest corrosion resistance in 13 wt%Sicoating after the heat treatment.