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Corrosion Properties of Electrolytic Coatings Based on СоW, CoRe, and CoWRe Alloys

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We established the chemical composition, current efficiency, and corrosion properties of CoW and CoRe binary alloys and CoWRe ternary alloys obtained from electrolytes of two types: citrate and citrate-pyrophosphate. It was discovered that the alloys deposited from citrate electrolyte contain much more refractory metals [51.0 at.% Re and 46.2 (W + Re)] for the same current density of deposition (10 mA ⋅ cm–2) than the alloys deposited from citrate pyrophosphate electrolytes [13.5 at.% Re and 23.9 at.% (W + Re)]. The main advantage of application of citrate-pyrophosphate electrolytes is their high current efficiency (of up to 85.7%). The results of corrosion investigations carried out in a 3.5% NaCl solution show that the corrosion resistance of CoWRe alloys is higher than the corrosion resistance of CoRe alloys. Actually, they are equal to 3.2 and 2.8 k Ω ⋅ cm2 for citrate electrolytes and 5.4 and 3.6 k Ω ⋅ cm2 for citrate-pyrophosphate electrolytes, respectively. The corrosion resistances of the coatings depend on their phase compositions, in particular, on the formation of a solid solution of rhenium in cobalt for the CoRe alloy and appearance of a nanocrystalline coating for the CoWRe alloy.

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Correspondence to V. S. Кublanovsky.

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Translated from Fizyko-Khimichna Mekhanika Materialiv, Vol. 56, No. 5, pp. 66–70, September–October, 2020.

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Yapontseva, Y.S., Маltseva, T.V. & Кublanovsky, V.S. Corrosion Properties of Electrolytic Coatings Based on СоW, CoRe, and CoWRe Alloys. Mater Sci 56, 649–653 (2021). https://doi.org/10.1007/s11003-021-00477-7

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  • DOI: https://doi.org/10.1007/s11003-021-00477-7

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