Wear and Corrosion Behavior of Aluminate- and Phosphate-Based Plasma Electrolytic Oxidation Coatings with Polytetrafluoroethylene Nanoparticles on AZ80 Mg Alloy
Source abstract
Abstract
The wear and corrosion behavior of PTFE-containing PEO nanocomposite coatings on AZ80 magnesium alloy were investigated. PEO nanocomposite coatings were produced using aluminate- and phosphate-based electrolytes for 10 min. It was found that PTFE nanoparticles effectively seal the micropores in both aluminate- and phosphate-based coatings. The wear examinations were performed using pin-on-disk (AISI 52100) tests under 2 loads of 3 and 5 N at a distance of 500 m. Compared to the uncoated base metal, the wear rate and the friction coefficient of the nanocomposite coatings with PTFE particles were significantly decreased. Among the prepared coatings, the coating formed in aluminate electrolyte with PTFE nanoparticles exhibited the best wear resistance. The polarization tests revealed that the corrosion resistance of the PTFE-containing coatings was superior to the coatings without PTFE. The coating obtained in the phosphate electrolyte containing PTFE nanoparticles showed the best corrosion performance. These results were confirmed by electrochemical impedance spectroscopy (EIS) and immersion tests for different times of 4, 24, 48 and 72 h immersion in 0.5 wt.% NaCl.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Magnesium Alloys: Properties and Applications · Aluminum Alloys Composites Properties · Corrosion Behavior and Inhibition
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References (51)
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