Mechanism of copper electrodeposition in the presence of picolinic acid |
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Authors: | Ana L Portela Gabriela I Lacconi |
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Affiliation: | INFIQC, Departamento de Fisicoquímica, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Haya de La Torre y Medina Allende, Ciudad Universitaria, 5000 Córdoba, Argentina |
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Abstract: | The influence of picolinic acid (PA) on copper deposition from a slightly acidic sodium sulphate electrolyte has been studied over a wide range of concentration and pH by cyclic voltammetry. The mechanism by which the copper electrodeposition process in the presence of PA takes place, depends on the chemistry and electrochemistry characteristics of the additive. Depending on the PA concentration and pH of the solution, five different cathodic current peaks are obtained, which are assigned to different steps involving copper deposition from free-Cu2+ ions and Cu(PA)n]2+ complex species as well as H+ ions electroeduction. Fine-grained, highly adherent and bright copper deposits were obtained. |
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Keywords: | Copper electrodeposition Additives Picolinic acid Pyridine-carboxylic acids |
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