How to improve the corrosion resistance of high-strength aviation aluminum alloy?

High-strength 2xxx and 7xxx aviation aluminum are prone to intergranular corrosion and stress cracking without surface protection. Factory production matches mature surface treatment processes: anodizing forms a dense alumina isolation film; chromate conversion coating improves coating adhesion; aviation-grade paint and primer further block moisture and salt fog at high altitude. Optimized aging heat treatment also reduces grain boundary precipitate segregation inside the alloy substrate, lowering internal corrosion risks for long-term aircraft service in marine humid air routes.