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Effect of Cl– and \({\text{SO}}_{4}^{{2 - }}\) Ions on Electrodeposition of Cobalt from Acidic Gluconate Solutions

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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.

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Authors and Affiliations

  1. AGH University of Science and Technology, Faculty of Non-Ferrous Metals, 30-059, Cracow, Poland

    Ewa Rudnik &  Namuun Dashbold

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  1. Ewa Rudnik
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Contributions

Rudnik E.—the idea and coordination of the work, characterization and buffer capacity of the baths, XRD measurements, analysis of the results, preparing of the manuscript. Dashbold N.—performance of the electrochemical experiments, microscopic observations.

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Correspondence to Ewa Rudnik.

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Ewa Rudnik, Namuun Dashbold Effect of Cl– and \({\text{SO}}_{4}^{{2 - }}\) Ions on Electrodeposition of Cobalt from Acidic Gluconate Solutions. Russ J Electrochem 55, 1305–1319 (2019). https://doi.org/10.1134/S1023193519120140

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