What types of corrosion affect aerospace materials?

Corrosion types in aerospace: General/uniform corrosion - Even material loss, predictable, managed with coatings; Pitting corrosion - Localized attack creating pits, can initiate fatigue cracks, common in aluminum; Galvanic corrosion - Dissimilar metals in contact with electrolyte, carbon-aluminum interface is severe; Stress corrosion cracking (SCC) - Combination of tensile stress and corrosive environment, 7xxx aluminum susceptible; Exfoliation - Layered corrosion along grain boundaries in worked aluminum; and Fretting corrosion - Wear plus corrosion at fastener interfaces. Prevention: Material selection (corrosion-resistant alloys, tempers), Surface treatments (anodizing, chromate conversion), Protective coatings (primer, paint), Design (drainage, sealants, isolation), and Inspection programs. Corrosion control is major maintenance cost; proper design and protection extend service life. Environmental regulations are phasing out some traditional treatments (chrome), requiring new approaches.