Abstract

A role of anions in potentiostatic electrodeposition of cobalt from acidic gluconate solutions was investigated. Equilibrium distribution of soluble species in the solutions was calculated and compared with absorption spectra. Cyclic voltammetry and potentiostatic measurements confirmed that cathodic process was inhibited mainly by free sulfate ions. Improved buffer capacity of gluconate baths by addition of sulfate ions protected against contamination of metal deposits by products of cobalt salt hydrolysis. Mathematical models of metal nucleation were tested indicating progressive mode responsible for the formation of the metal phase. Diffusion coefficients of cobalt species were also calculated using various approaches. Thickness, morphology and structure of cobalt deposits as well as cathodic current efficiency were also discussed.

中文翻译：

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Cl –和$$ {\ text {SO}} _ {4} ^ {{2-}} $$离子对酸性葡萄糖酸盐溶液中电沉积钴的影响

摘要

研究了阴离子在酸性葡萄糖酸盐溶液中钴的恒电位电沉积中的作用。计算溶液中可溶性物质的平衡分布，并将其与吸收光谱进行比较。循环伏安法和恒电位测量证实，阴极过程主要受游离硫酸根离子抑制。通过添加硫酸根离子，提高了葡萄糖酸盐镀液的缓冲能力，可防止钴盐水解产物污染金属沉积物。测试了金属成核的数学模型，指出了导致金属相形成的渐进模式。还使用各种方法计算了钴物种的扩散系数。还讨论了钴沉积物的厚度，形态和结构，以及阴极电流效率。