A self-lubricating coating is a kind of coating formed on the surface of the material by various processes that can self-replenish lubricating substances during the friction and wear process. This paper presents a comprehensive review of the processes and properties of self-lubricating ceramic coatings developed through Micro-arc Oxidation (MAO) on light alloys, including aluminum, magnesium, and titanium. Three technical approaches for the preparation of self-lubricating coatings via MAO are recapitulated. The structures and properties of the self-lubricating coatings prepared by each technical route are compared and analyzed, and the future development tendency of this field is also anticipated.

Lightweight alloys, such as aluminum, magnesium, and titanium alloys, are extensively utilized in the aerospace, transportation, and military domains owing to their low density, high specific strength, and outstanding fatigue resistance. Nevertheless, their inherently low hardness and inferior wear resistance give rise to substantial friction and wear issues, thereby restricting their operational reliability and service lifespan. To address this concern, surface treatments employed in the preparation of self-lubricating coatings have assumed a pivotal role. This study conducts a comprehensive review of the research advancements regarding typical self-lubricating coatings, with a particular emphasis on their preparation methodologies and performance characteristics. Ultimately, the principal challenges within this field are systematically summarized, and prospects for future development are put forward.