Studies on Cyclic Voltammetry Characteristics and Initial Behavior of Nickel-Tungsten Electrodeposition
- 化学化工－已发表论文 
镍钨合金镀层由于其高的硬度、耐磨及耐蚀性而被作为代铬镀层用于金属表面处理。为进一步探讨镍钨合金的电沉积机理，采用循环伏安法和电位阶跃法研究了玻碳电极上镍钨电沉积的循环伏安特性和初期行为。电沉积过程中，钨酸根被还原成中间价态的氧化物。结果表明，钨酸盐的存在对阴极析氢过程具有明显的阻化作用。镍钨合金电沉积按瞬间成核和三维生长方式进行Nickel-tungsten alloy eletrodeposits have been adopted as chromium substitute coatings for surface treatment for their high hardness and excellent wearability and corrosion resistance.The purpose of the study was to investigate the mechanism of nickel-tungsten electrodeposition.The cyclic voltammetry characteristics and initial behavior of nickel-tungsten alloy on glass carbon electrode were studied by means of cyclic voltammetry and potentiostatic step. Tungstate ions were reduced to oxide with intermediate valence.The results show that the existence of tungstate has great restraint action on cathodic hydrogen evolution. The electrodeposition of nickel-tungsten alloy performs as instantaneous nucleation followed by three dimensional growth.