Comparison of corrosion and wear behavior of PEO/PTFE nanocomposite coatings in base-aluminate and phosphate electrolytes on AZ80 magnesium alloy In this study, the effect of adding polytetrafluoroethylene (PTFE) polymeric nanoparticles on the wear and corrosion behavior of plasma electrolytic oxidation coatings composed of base-aluminate and phosphate electrolytes on AZ80 magnesium alloy has been investigated. An analysis of the Energy distribution map of elements with a scanning electron microscope from the surface of the coatings indicates that the PTFE particles have significantly sealed the surface porosity. The x-ray diffraction analysis with graizing mode from the surface of the coating revealed the peak of the presence of PTFE particles at an angle of 16.8 degrees. The wear behavior of the coatings was evaluated using a dry sliding test pin (AISI 52100) on a disk under loads of 3 and 5 N and at a distance of 500 meters. Under the load of 3 N, containing-PTFE coatings remained perfectly healthy, while the wear-side failure effects on the surface free-PTFE coatings were clearly evident from the microscopic image of the wear track. Under the load of 5 N, free-PTFE coatings were completely degraded and reached the substrate of magnesium, which was essentially due to the abrasive mechanism. In contrast, PEO/PTFE coatings obtained in both aluminate and phosphate electrolytes showed partial degradation, which was consistent with the results of the coefficients of friction-distance diagram. Also, SEM analysis from the pins surface and the weight change of samples and pins showed that pieces of coating that are attached to the steel pin surface for non-nanoparticle coatings are much more than composite coatings. The wear resistance of nanocomposite coatings caused by PTFE particles is mainly due to the lubricating properties of these particles, which when applied to the surface of the coating, prevents direct contact pin with the coating, thus reducing wear rate and friction coefficients. The friction coefficient of the coatings formed in the aluminate and phosphate electrolytes was reduced from 0.64 and 0.7 to 0.33 and 0.4 by adding PTFE particles, respectively. The corrosion performance of coatings was performed by tafel polarization test and electrochemical impedance spectroscopy. The results indicate that according to the polarization test, the corrosion rate of phosphate and aluminate coatings containing PTFE particles compared to non-particulate coatings is reduced to 5.44 and 7.61, respectively. by performing an electrochemical impedance test at 4, 24, 48 and 72 hours immersion, the internal and external layer (R in and R out ) resistance values for coatings containing PTFE nanoparticles were found to be much higher than those without PTFE coatings due to the reduction of microcrack And porosity. Also, the decrease in capacitive capacitance (CPE) of these two layers was due to the decrease in the penetration of the corrosive solution to the coating and in fact to reduce the effective surface of the coatings. Keywords: Plasma Electrolytic Oxidation, AZ80 Magnesium, PTFE, Corrosion, wear, Friction Coefficient