Microstructure and electrochemical corrosion properties of nickel-plated carbon nanotubes composite Inconel718 alloy coatings by laser melting deposition

Abstract

Abstract Nickel-plated carbon nanotubes composite inconel718 alloy coatings were prepared on 304 stainless steel by laser melting deposition. Its properties of microstructure, wear resistance and corrosion resistance were studied. In the inconel718 coating, the phases are γ-(Ni, Fe), γ′-Ni (Al, Ti) and Fe3Ni2. Compared with the coating without nickel-plated carbon nanotubes, the new phases are C, (Fe, C), C70 and Fe5C2, the grain structure is more uniform, the number of cracks is less and the length of cracks is shorter, the hardness is reduced by 21%, the self-corrosion potential is decreased by 4.4%, the corrosion current density is increased by 47%, the polarization resistance is decreased by 44%, the friction coefficient increases by 18% and the mass wear increases by 83%.