Journal of Ultrafine Grained and Nanostructured Materials (Dec 2015)
Growth, corrosion, and wear study of nanocomposite PEO coating in electrolyte containing nickel sulfate
Abstract
Plasma electrolytic oxidation (PEO) was performed on a 1010 Aluminum alloy. To achieve thenanocomposite structure, Si3N4 nanoparticles were added into the electrolyte. In an alkaline aqueoussuspension (silicate-based), the effect of adding NiSO4 on the applied voltage, microstructure,composition, wear, and corrosion resistance of PEO coatings was investigated using ScanningElectron Microscopy (SEM), elemental analysis with Energy Dispersive Spectroscopy (EDS), X-RayDiffraction (XRD), cyclic polarization test, and pin-on-disk wear test. The results showed that addingnickel sulfate (NiSO4) and infiltration of its constituents into coatings lead to a more favored corrosionbehavior. Moreover, in the case of best sample, anodic current at the highest applied potentialcondition during the cyclic polarization test indicated a drop within two decades. Moreover,coefficient of friction decreased almost by half.
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