Abstract Impurities present in the sulfate electrolyte during nickel electrodeposition influence the electrowinning process and morphology of deposited nickel metal in various ways. The presence of aluminium can be either detrimental or beneficial, depending on its concentration. Effects of the presence of aluminium in the electrolyte during nickel electrowinning were investigated by evaluation of the relationship between nucleation and plating overpotentials, nickel morphology, deposit contamination, internal stress development, and buffer characteristics of the electrolyte. Results showed that aluminium present at concentrations of lower than 1250 mg/L was unfavourable for the electrowinning process and highly strained nickel deposits of poor morphology were produced; at higher concentrations, the presence of aluminium was advantageous for the morphology and internal stress, and correlated with increased buffer characteristics of the electrolyte.

中文翻译：

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铝对电解沉积应用中典型硫酸镍电解液极化参数和沉积特性的影响

摘要 镍电沉积过程中硫酸盐电解液中存在的杂质以多种方式影响电积过程和沉积的镍金属的形貌。铝的存在可能是有害的，也可能是有益的，这取决于它的浓度。通过评估成核与电镀过电位、镍形态、沉积物污染、内部应力发展和电解液缓冲特性之间的关系，研究了镍电解提取过程中电解液中铝的存在的影响。结果表明，低于 1250 mg/L 的铝浓度不利于电解沉积过程，并且会产生形态差的高应变镍沉积物；在较高浓度下，