An improvement of the wear and corrosion resistances of AZ31 magnesium alloy by plasma electrolytic oxidation in a silicate–hexametaphosphate electrolyte with the suspension of SiC nanoparticles

作者: Lu Yu , Jinhui Cao , Yingliang Cheng

DOI: 10.1016/J.SURFCOAT.2015.07.014

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摘要: Abstract Plasma electrolytic oxidation (PEO) of AZ31 magnesium alloy under pulsed bipolar constant current regimes has been carried out in a silicate–hexametaphosphate electrolyte without and with the suspension SiC nanoparticles. The coatings were characterized by eddy method, X-ray diffraction (XRD), scanning electron microscopy (SEM), dry sliding wear electrochemical tests. Higher growth rates found for formed presence incorporation nanoparticles into verified XRD SEM, incorporated particles to distribute relatively uniformly along coating depth. “Weak sites” existed free coatings, which significantly lowered performance coatings. In contrast, “weak are not nanoparticles, resulting an excellent applied densities PEO processes also affect higher prepared densities. All show improved corrosion resistances.

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