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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.
In situ fabrication of high-percent Ni–graphene nanocomposite coating
Hassannejad Hossein,Nouri Ashkan,Farrokhi-rad Morteza,Molavi Fatemeh Khademeh 한국탄소학회 2020 Carbon Letters Vol.30 No.1
A novel approach was presented for deposition of nickel–graphene nanocomposite coating on copper. Unlike conventional methods, graphene and graphene oxide nanosheets were not used. The basis of the method is to synthesize graphene oxide by oxidation of graphite anode during the electrochemical deposition process. The obtained graphene oxide sheets were reduced during the deposition in the cathode and co-formed with the nickel deposition in the coating. The pulsed ultrasonic force was applied during the deposition process. When the ultrasonic force stops, the deposition process begins. Scanning electron microscopy, Raman spectroscopy, atomic force microscopy, X-ray difraction and X-ray photoelectron spectros�copy confrmed the presence of graphene nanosheets in the coating. The amount of graphene nanosheets increases up to a maximum of 14.8 wt% by increasing the time of applying ultrasonic force to 6 s. In addition, with the presence of graphene in the nickel coating, the wear rate dramatically decreased.