Abstract
Finely crystalline cobalt–molybdenum–tungsten coatings were deposited in the nonsteady-state mode from a polyligand citrate-pyrophosphate electrolyte at a concentration ratio of the alloy-forming components Co2+/(WO 2–4 + MoO 2–4 ) = 1: 1 and citrate/pyrophosphate ligands of 1: 2. It was found that the quantitative composition and current efficiency by the ternary alloy depends on the current density. The effect of energy- and time-related parameters of the pulsed electrolysis on the surface morphology and roughness was studied. It was shown that, as the total content of refractory metals in Co–Mo–W coatings increases, the corrosion rate decreases in the acid medium and increases in the alkaline medium because of the instability of molybdenum and tungsten oxides.
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Original Russian Text © N.D. Sakhnenko, M.V. Ved, Yu.K. Hapon, T. A. Nenastina, 2015, published in Zhurnal Prikladnoi Khimii, 2015, Vol. 88, No. 12, pp. 1694–1698.
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Sakhnenko, N.D., Ved, M.V., Hapon, Y.K. et al. Functional coatings of ternary alloys of cobalt with refractory metals. Russ J Appl Chem 88, 1941–1945 (2015). https://doi.org/10.1134/S1070427215012006X
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DOI: https://doi.org/10.1134/S1070427215012006X