Study On Preparation And Properties Of Nickel-based Amorphous Alloy Coatings

In order to prepare electrode materials with low hydrogen evolution overpotential and produce hydrogen with high efficiency and low energy consumption,Ni-Sn-Mo amorphous alloy coating is prepared on the surface of pure copper by pulse electrodeposition.Using scanning electron microscope,energy spectrometer,X-ray diffractometer,cyclic voltammetry,electrochemical impedance spectroscopy,cathodic polarization curves,Tafel curves,constant potential discontinuous curve and open circuit potential time curve,studies the complexing agent sodium citrate,solution pH,current density,pulse duty ratio and plating time and temperature of the plating solution of Ni-Sn-Mo amorphous alloy coating surface morphology,composition,phase structure,the deposition rate,hydrogen evolution properties,mechanism of hydrogen evolution and the effect on the stability of the hydrogen evolution,determines the pulse electroplating NiSn-Mo of amorphous alloy cladding that optimal electrolyte composition and process parameters as follows: Na₂C₆H₅O₇·2H₂O 0.1 mol/L,NiSO₄·6H₂O 0.17 mol/L,SnCl₂·2H₂O 0.15 mol/L,Na2 MoO4·2H₂O 0.05 mol/L,Ascorbic acid 3 g/L,Saccharin 3g/L,H₃BO₃ 30 g/L,Sodium lauryl sulfate 0.1 g/L,pH 5.0,current density 12.5 m A/cm²,duty cycle 0.2,plating time 30 min,bath temperature 30 ℃.The Ni-Sn-Mo alloy coating prepared under the optimal process has a typical amorphous structure,and the content of Ni、Sn、Mo is 76.32 wt.% 23.28 wt.% and 0.4wt.% respectively.Compared with Ni-Mo alloy coating,Ni-Sn-Mo amorphous alloy coating has good hydrogen evolution performance and hydrogen evolution stability in 1mol/L Na OH solution.The electrodeposition mechanism of Ni-Sn-Mo alloy is analyzed by electrochemical methods such as cyclic voltammetry curve electrochemical impedance spectrum timecurrent curve.The nucleation of alloy follows the law of continuous nucleation.Figure 68;Table 40;Reference 92.