WEAR BEHAVIOR OF THE CERAMIC COATINGS ON THE Al6061 ALLOY PREPARED BY PLASMA ELECTROLYTIC OXIDATION

The oxide coatings were prepared on T6-tempered A16061 alloys substrate under a hybrid voltage (AC 200V-60Hz & DC 260V value) in an aluminate electrolyte by plasma electrolytic oxidation (PEO) in 5, 10, 15, 20 and 30 min, respectively. X-Ray diffraction (XRD) and scanning electron microscopy (SEM) were used to investigate the coating microstructure. XRD analysis results show that the coatings consist of α- and γ-Al₂O₃. The abrasive behaviors of the oxide coatings in different PEO-treated times were tested assessed by conducting dry ball-on-disk wear tests. The abrasive weight loss increased when the PEO-treated time increased, and finally became equilibrium.