Effects of cathode pulse at high frequency on structure and composition of Al2TiO5 ceramic coatings on Ti alloy by plasma electrolytic oxidation

▶ Al2TiO5 in the coating on Ti alloy by PEO treatment changes with the increase of the cathode pulse, regardless of the amount and the grain size. ▶ The cathode pulse brings about the decrease of γ-Al2O3 and the increase of rutile TiO2 in the coating. ▶ The appropriate cathode pulse during PEO process is beneficial to reduce residual discharging channels and improve the density of the coating.