Functional coatings of ternary alloys of cobalt with refractory metals

Functional coatings of ternary alloys of cobalt with refractory metals 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 4 2– + MoO 4 2– ) = 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. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Russian Journal of Applied Chemistry Springer Journals

Functional coatings of ternary alloys of cobalt with refractory metals

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Publisher
Pleiades Publishing
Copyright
Copyright © 2015 by Pleiades Publishing, Ltd.
Subject
Chemistry; Chemistry/Food Science, general; Industrial Chemistry/Chemical Engineering
ISSN
1070-4272
eISSN
1608-3296
D.O.I.
10.1134/S1070427215012006X
Publisher site
See Article on Publisher Site

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 4 2– + MoO 4 2– ) = 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.

Journal

Russian Journal of Applied ChemistrySpringer Journals

Published: Mar 3, 2016

References

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