Preparation And Characterization Of Nickel-based Composite Coatings

To prepare nickel-based composite coatings with good corrosion resistance and hydrogen evolution catalytic performance,Ni-Sn/TiO₂ composite coating was prepared by pulse electrodeposition with Q235 steel as the matrix.The effect of pulse duty cycle,plating time,stirring rate and the mass fraction of TiO₂ on the composition,surface morphology,roughness and corrosion resistance of Ni-Sn/TiO₂ coating was investigated by energy dispersive spectroscopy,scanning electron microscopy,laser confocal microscopy,Tafel curve and electrochemical impedance spectroscopy,the deposition mechanism of Ni-Sn/TiO₂ composite coating was studied by means of cyclic voltammetry,electrochemical impedance spectroscopy and chronoamperometry.NiW/MoS₂ composite coating was prepared with pure copper as the matrix.The effect of MoS₂ activation time,current density,the mass fraction of SDS and the mass fractionon of MoS₂ on the composition,3D morphology,roughness and hydrogen evolution performance of Ni-W/MoS₂ coating was investigated by energy dispersive spectroscopy,laser confocal microscopy,Tafel curve and electrochemical impedance spectroscopy.The results of Ni-Sn/TiO₂ composite coating show that the best electrodeposition process with corrosion resistance are pulse duty cycle 0.2,plating time 30 min,stirring rate 40 rpm,and the best corrosion resistance TiO₂ mass fraction is 5 g·L^-1.The electrodeposition process of Ni-Sn/TiO₂ composite coating has nucleation behavior,the electrode reaction is an irreversible process,the electrodeposition process is mainly controlled by kinetics,and the nucleation mechanism is instantaneous nucleation.The results of Ni-W/MoS₂ composite coating show that the best electrodeposition process for hydrogen evolution is: MoS₂ activation time 4 min,current resistance 7A·dm^-2,the best hydrogen evolution performance of SDS mass fraction is 0.4 g·L^-1,MoS₂ mass fraction is 1.0 g·L^-1.Figure40;Table35;Reference 79...