Research Progress on the Preparation and Tribological Properties of Self-Lubricating Coatings Fabricated on Light Alloys

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.