Improving the wear properties of AZ31 magnesium alloy under vacuum low-temperature condition by plasma electrolytic oxidation coating

In this paper, Al-doped ceramic coatings with a thickness of 22–27 µm were prepared on AZ31 magnesium alloy by plasma electrolytic oxidation (PEO) in electrolytes that contain varied concentrations of NaAlO2, aiming to improve its wear resistance under vacuum low-temperature (−50 °C) condition. These obtained ceramic coating were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy...