Abstract
A gluconate-based electrolyte was used for the electrodeposition of nanocrystalline Co-W coatings. The major effect of the pH on the deposition rate, the alloys content and structure, and their microhardness and tribological properties is shown. It is supposed that the coating characteristics are formed under the influence of high-molecular Co-gluconate and Co-W-gluconate complexes generated in the electrolyte depending on the solution pH. A pH of 6–7 is found to be optimal for obtaining the best coating characteristics. Higher values (pH 8) cause an increase in the molecular weight of the formed complexes from which deposition occurs. As a consequence, the electrodeposition parameters and physicomechanical properties of the coatings deteriorate. At lower pH values (pH 4–5), the tungsten content in the deposit decreases because of the higher rate of cobalt reduction from the Co-gluconate complex.
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Original Russian Text © Zh.I. Bobanova, V.I. Petrenko, G.F. Volodina, D.M. Kroitoru, A.I. Dikusar, 2015, published in Elektronnaya Obrabotka Materialov, 2015, No. 1, pp. 26–37.
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Bobanova, Z.I., Petrenko, V.I., Volodina, G.F. et al. The effect of the pH on the composition and properties of Co-W alloys manufactured from gluconate electrolyte. Surf. Engin. Appl.Electrochem. 51, 25–37 (2015). https://doi.org/10.3103/S1068375515010020
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DOI: https://doi.org/10.3103/S1068375515010020