Abstract
The corrosion characteristics of thin coatings (5 µm) with binary and ternary alloys CoW, CoRe, CoWRe, obtained from poly-ligated citrate-pyrophosphate electrolyte, depending on the concentration of potassium perrhenate, were investigated. The methods of impedance spectroscopy and voltammetry have shown that the most corrosion-resistant coatings were obtained with a current density of 10 mA·cm−2. The largest value of corrosion resistance and microhardness is inherent in the CoWRe alloy and is 3.2 kΩ·cm2 in 1 M KOH solution and 644 HV. It has been found that an increase in the rhenium content in the alloy results in an increase in the current efficiency (CE) during the precipitation of the alloy from the alkaline citrate-pyrophosphate electrolyte and CE reaches 84%.
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