Abstract
Microarc oxidation (MAO) composite coatings containing rutile TiO2 were produced on 2024 aluminum alloy in an electrolyte with nanorutile TiO2 particles. The microstructure and properties of the composite coatings were analyzed by SEM, EDS, laser confocal microscope, XRD, Vickers hardness tester, scratch test and friction test, respectively. The results showed that the composite coatings consisted of [Formula: see text]-Al2O3, [Formula: see text]-Al2O3, mullite and rutile TiO2. With increasing concentration of rutile TiO2 particles in the electrolyte, the compactness of the composite coatings was improved significantly. The abrasion performance of the microarc oxidation composite coatings containing rutile TiO2 was better than that of MAO coatings without rutile TiO2.
Highlights
Light metals and their alloys are important structural materials and are extensively applied in aerospace and transportation systems.[1,2] Aluminum alloys with excellent performance have received much attention.[3]
Microarc oxidation (MAO) can be used for the preparation of ceramic-like oxide coatings on some light metals based on anodic oxidation, thermochemistry, electrochemistry and plasma chemical mechanisms
More microcracks were produced by the increase and uneven distribution of the thermal stress, which was promoted by some of the nanorutile TiO2 particleslling the micropores on the composite ceramic coatings and other rutile TiO2 particles agglomerating and forming large bulges on the composite coatings
Summary
Light metals and their alloys are important structural materials and are extensively applied in aerospace and transportation systems.[1,2] Aluminum alloys with excellent performance have received much attention.[3] the applications of aluminum alloys are seriously restricted by their low surface hardness and high wear rate.[4,5,6,7] To date, many aluminum alloy surface treatment methods have been developed and employed to improve the hardness and friction performance of aluminum alloy Most of these technologies require high temperature and are complex. The adhesion force between the coating and substrate is investigated
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