Electrodeposition of Binary and Ternary Rhenium Alloys

This work presents a comparative analysis of the chemical and phase composition, current efficiency, and microhardness of binary and ternary electrolytic CoRe and CoWRe alloys, deposited from two types of electrolytes: acidic citrate and alkaline citrate-pyrophosphate ones. It has been shown that the use of electrolytes of various complexes compositions makes it possible to vary the amount of rhenium in the coatings over a wide range (12 – 59 at.%). Ternary CoWRe alloys contain 4 – 9 at.% of tungsten, and they are deposited with higher current efficiency (up to 86%) than binary alloys. By selecting the composition of the electrolyte and the electrolysis mode, it is possible to regulate not only the chemical composition but also the structure of the coatings and to obtain X-ray amorphous or crystalline alloys, depending on the task.