用化学镀方法制备出Ni Co W P合金电极 ,测量了其在 1mol/LNaOH溶液中的阴极极化曲线并研究了其析氢电催化活性。试验表明 ,在相同的电流密度下 ,Ni Co P ,Ni W P和Ni Co W P合金电极的析氢过电位较Fe电极降低 ,其中Ni Co W P的析氢过电位降低约 2 30mV ,XRD试验显示其镀层为非晶态。并进一步测试了其在 7mol/LKOH中的连续电解曲线。结果表明 :Ni Co W P合金电极比Ni Co P ,Ni W P合金电极具有更好的析氢电催化活性和电化学稳定性 ,有利于降低槽压 。
Ti coating on A3 steel was successfully prepared by direct electrochemical reduction of high-velocity oxy-fuel （HVOF） thermally sprayed and room-temperature dip-coating titanium dioxide coating on A3 steel in molten CaCl2 at 850 ℃. The interfacial microstructure and mutual diffusion between coating and steel substrate were investigated using scanning electron microscopy （SEM） and energy dispersive X-ray （EDX） spectroscopy. The results show that the precursory TiO2 coating prepared by HVOF has closer contact and better adhesion with the A3 steel substrate. After electrolysis, all of the electro-generated Ti coatings show intact contact with the substrates, regardless of the original contact situation between TiO2 layer and the steel substrate in the precursors. The inter-diffusion between the iron substrate and the reduced titanium takes place at the interface. The results demonstrate the possibility of the surface electrochemical metallurgy （SECM） is a promising surface engineering and additive manufacturing method.
