In this research, the Cr/TiO2 composite coatings were formed in Na2HPO4+ NaOH + Cr2O3 by micro-arc oxidation (MAO) technology with different ratios of anodic and cathodic currents. Surface morphology results showed that the pancake-like structures on the coating surface decreased with the ratio decreased. XRD results showed the TiO2:Cr3+ coatings are composed of anatase and rutile phase and the anatase content first increased and then decreased. XPS results indicated that Ti2p spin–orbit components of the Cr/TiO2 composite coatings are shifted towards higher binding energy, compared with the pure TiO2 coating, suggesting that some of the Cr3+ ions are incorporated into TiO2 lattice. The photocatalytic experiment results showed that the photocatalytic activity of Cr/TiO2 MAO coatings can be greatly enhanced with a moderate amount of Cr3+.
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