Application of Non-Stationary Electrolysis in Deposition Corrosion-Resistant Zinc–Nickel, Zinc–Nickel–Cobalt Alloys

Abstract

A promising direction for modifying the properties of electrodeposited coatings is the use of non-stationary electrolysis and the introduction of an additional alloying component. The effect of the reverse potential polarization mode parameters on the composition and corrosion resistance of Zn–Ni, Zn–Ni–Co alloys was studied. The coatings were deposited on a steel support (St45) in a sulfate-glycinate solution. The alloys were studied by X-ray diffraction, X-ray fluorescence and gravimetric analysis, scanning electron microscopy. It is established that the use of the reverse electrolysis mode contributes to the production of finer crystalline coatings with a high Ni content in the alloy. The inclusion of Co in the Zn–Ni alloy, the use of the reverse polarization mode contributes to an increase in its corrosion resistance by ~2 times at a thickness of 5‒10 μm.