Electrolytic Ni–Re alloys are obtained from sulfamate and citrate electrolytes for current densities varying within the range 0.3–5.0 A·dm–2 at temperatures of 15 and 40°C. We determine the quantitative composition of the coatings and the structure and morphology of the obtained deposits depending on the composition of electrolytes and the modes of electrolysis. The Ni–Re alloys contain 20–60% Re if they are deposited from a simple sulfamate electrolyte, 5–30% Re if they are obtained from a complex citrate bath [for a low concentration (0.01 М) of potassium perrhenate KReO4 ], and 90–92% Re in the presence of 0.02 М of KReO4 . As temperature increases in the course of codeposition from a sulfamate electrolyte, the rhenium content of the alloy decreases. However, for the codeposition from a citrate electrolyte, the temperature only slightly affects the composition of deposits. It is shown that the structure of the obtained alloys is nanocrystalline. The grain size of deposits decreases as the fraction of rhenium in the alloy increases. The corrosion resistance is higher for coatings with lower content of rhenium in the deposit. The best anticorrosive properties are exhibited by the alloys with about 8–10% of rhenium.
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Translated from Fizyko-Khimichna Mekhanika Materialiv, Vol. 54, No. 4, pp. 57–61, July–August, 2018.
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Bersirova, O.L., Kublanovsky, V.S. Nickel–Rhenium Electrolytic Alloys: Synthesis, Structure, and Corrosion Properties. Mater Sci 54, 506–511 (2019). https://doi.org/10.1007/s11003-019-00211-4
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DOI: https://doi.org/10.1007/s11003-019-00211-4