Abstract
We study the corrosion properties of Co–Mo–Re electrolytic alloys deposited from citrate electrolyte with pH 3.5 and 6.3. It is shown that these coatings have high corrosion resistances in acid, neutral, and alkaline solutions. We analyze the influence of density of the deposition current and, hence, of the chemical composition of coatings on their corrosion behavior in a KOH solution. It is shown that the corrosion resistance depends on the rhenium content of the deposit. This element proves to be the most corrosion-resistant component. We investigate the catalytic properties of the obtained alloys in the reaction of hydrogen release running in a KOH solution. It is shown that rhenium exerts a negative influence on the overvoltage of hydrogen release and the alloy with better anticorrosion properties reveals hydrogen overvoltage greater than for the pure cobalt. As the rhenium content of the deposit becomes lower, we observe the manifestations of catalytic activity, i.e., the overvoltage of hydrogen reduction becomes weaker and the corrosion resistance of the coatings significantly decreases.
Published Version
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