Corrosion resistance of Co−Cr−W coatings obtained by electrodeposition

Corrosion-resistant Co−Cr−W coatings are electrolytically deposited onto the surface of low-carbon (0.25 wt.% C) steel samples from a Cr(III) chloride-based water–dimethylformamide (DMF) bath. Polarization measurements show that corrosion current densities in both sodium chloride and Hank’s solutions are about 10 −6 A cm −2 . As the obtained coatings contain a certain amount of cracks, they should be deposited onto the surface of copper underlayer in order to provide better protective ability. An XPS study showed that the surface of Co−Cr−W coatings is enriched with chromium compounds as a result of exposure to the corrosive solution.