Effects of Co and W alloying elements on the electrodeposition aspects and properties of nanocrystalline Ni alloy coatings

► Corrosion resistance of Ni coatings is under direct control of surface structure. ► Co content and surface structure affect the corrosion resistance of Ni-Co coatings. ► Surface structure strongly determines the corrosion resistance of Ni-W coatings. ► Surface structure and grain size of Ni-Co-W coatings do not change by current density.