Advancements in corrosion protection for aerospace aluminum alloys through surface treatment

This review delves into the dynamic field of corrosion protection for aerospace aluminum alloys, emphasizing the evolution of surface treatment technologies. Aluminum alloys, central to the aerospace industry due to their optimal blend of low density and high strength-to-weight ratio, face persistent challenges in corrosion resistance. The review explores the transition from traditional corrosion protection methods like chromate conversion coatings and anodizing to innovative and environmentally friendly alternatives. Key advancements include the development of rare earth element-based coatings and organic-inorganic hybrid coatings, which have demonstrated significant improvements in corrosion resistance. For instance, cerium-based coatings offer a viable replacement for chromate coatings, while polymer coatings, enhanced with corrosion inhibitors, present a versatile solution. The incorporation of nanotechnology, particularly graphene and nanostructured coatings, marks a significant stride, offering enhanced barrier properties and self-healing capabilities. The review identifies the need for balancing environmental sustainability with effective corrosion protection and the adaptation to new aerospace materials as ongoing challenges. This shift towards advanced, environmentally conscious coatings represents a pivotal advancement in ensuring the safety and longevity of aerospace components under corrosive conditions.