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Electrochemical Behavior of Nickel in HNO_3 and the Effect of Chloride Ions

机译:镍在HNO_3中的电化学行为及氯离子的影响

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The electrochemical behavior of nickel in HNO_3 solutions of varying concentrations was examined using the cyclic voltammetry and potentiodynamic anodic polarization techniques. The anodic branch of the cyclic voltammogram is characterized by one anodic dissolution peak and a passivation region before oxygen evolution. The cathodic branch shows only one cathodic reduction peak corresponding to the reduction of HNO_3. Analysis of the anodic polarization data shows features of both reversible and irreversible reactions pointing to the complexity of the system. Cl~- ions enhance the active dissolution of nickel in HNO_3 due to the adsorption on the bare metal surface and cause destruction of the passive film and initiation of pitting corrosion.
机译:使用循环伏安法和电位动力学阳极极化技术检查了镍在不同浓度的HNO_3溶液中的电化学行为。循环伏安图的阳极分支的特征在于一个阳极溶解峰和一个在放氧前的钝化区。阴极分支仅显示一个对应于HNO_3还原的阴极还原峰。阳极极化数据的分析显示了可逆和不可逆反应的特征,表明了系统的复杂性。 Cl_-离子由于在裸金属表面上的吸附而增强了镍在HNO_3中的活性溶解,并导致钝化膜的破坏和点蚀的开始。

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