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Micro-arc oxidation (MAO) coatings were formed on ZL108 aluminum alloy in silicate electrolyte with CoSO 4 . Scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and electrochemical workstation were used to investigate the effects of CoSO 4 on the microstructure, phase composition, elemental distribution and corrosion resistance of the MAO coatings. The results showed that the addition of CoSO 4 increased the micro arc oxidation voltage, whichdoi:10.20964/2020.06.78 fatcat:mpjb7dlx6nallokvybsdkzovce