Nanocrystalline Ni-W alloy coatings show superior corrosion and wear resistance. Ni-W alloys have attracted attention in past years due to their outstanding catalytic properties that are supposed to be applied at hydrogen evolution. In general, nanocrystalline coatings produced by the means of electrodeposition are gaining attention due to tailoring properties reached by controlling electrodeposition parameters. Concerning corrosion resistance of nanocrystalline materials, an ambiguity appears. High volume fraction of grain boundaries contributes to the corrosion resistance showing different results among various metals and corrosion environment. In general the coatings are sensitive to the experimental conditions including used electrolyte, pH, temperature and current density. Nanocrystalline, amorphous, intermetallics and combination of these phases can be obtained while changing different parameters in Ni-W electrodeposition. Grain size decreases with increasing tungsten content in the alloy, which contributes to amorphous phase formation. The alloy properties are fundamentally affected by the composition and morphology.
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