Abstract
This study continues previous work which showed that the anomalous behavior of Co–Ni deposition could be alleviated or eliminated through use of cyclic voltammetry (CV) or pulse reverse (PR) plating. The research focuses on aspects not considered in this previous work: the effects of the anion and agitation in the plating bath. A comparison is made of Co–Ni electrodeposition using the CV and PR techniques in sulfate and chloride baths at pH 3 containing equimolar Co(II) and Ni(II) concentrations under both stirred and unstirred conditions. The anomalous behavior can be significantly suppressed and even eliminated with current efficiencies above 90 % through use of PR plating, in particular, but only if carried out in a chloride solution under quiescent conditions. Both metal ion reduction during the cathodic portion and oxidation of the coating during anodic polarization are accelerated in the chloride solution relative to that in the sulfate solution. Electrolyte agitation exacerbates anomalous deposition and reduces the current efficiency by enhancing mass transport of Co(II) and H+ to and from the electrode. The origin of anomalous deposition and effects of the chloride ion are examined in terms of coordination chemistry and ligand field theory. This analysis suggests that oxidation of the Co–Ni coating in the chloride solution during anodic polarization of the PR and CV cycles when cobalt preferentially dissolves is crucial to suppressing the anomalous behavior. Examination of the coatings shows that the anion type, degree of agitation of the electrolyte, and electroplating technique significantly affects their microstructure and roughness.
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The authors are indebted to the Natural Sciences and Engineering Research Council of Canada (NSERC) for financial support to carry out this work. JVA expresses gratitude to the Mexican Council of Science and Technology (CONACyT) for the stipends received through SNI.
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Dedicated to Prof. Alexander Milchev on the occasion of his 70th birthday
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Vazquez-Arenas, J., Pritzker, M. Effect of electrolyte and agitation on the anomalous behavior and morphology of electrodeposited Co–Ni alloys. J Solid State Electrochem 17, 419–433 (2013). https://doi.org/10.1007/s10008-012-1932-z
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DOI: https://doi.org/10.1007/s10008-012-1932-z