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Influence of spraying power and immersion time on electrochemical corrosion of Ni-5wt.%Al alloy coatings in 3.5 wt.% NaCl solution

The effect of spraying power and immersion time on the microstructure and electrochemical corrosion behavior of plasma-sprayed Ni-5wt.%Al alloy coatings were studied. The spraying powers have a great influence on the electrochemical corrosion behavior of the coatings by affecting their surface roughness and porosity. The self-corrosion current density of the coatings was much lower when the surface roughness and porosity of the coatings were both lower. In addition, with the increase of immersion time, the self-corrosion current density of the coatings was decreased first, then increased, and finally decreased, which may be related to the formation and disappearance of Al2O3 in the coatings.