Effect of coastal atmospheric corrosion on fatigue characteristics of 2A12-T4 aluminum alloy plate

Conducting laboratory accelerated simulation tests on the atmospheric environment in which aviation materials are used to obtain their long-term corrosion behavior and life degradation is an important content and foundation for the design, manufacturing, maintenance, life assessment, and life control of related materials and equipment. The laboratory accelerated corrosion tests for simulated coastal atmospheric corrosion of 2A12-T4 aluminum alloy plates is conducted, and the impact of corrosion on the fatigue characteristics of aluminum alloy plates throughout the entire coastal atmospheric corrosion process from initial pitting to later erosion is simulated. Based on the principle of equivalent fatigue life degradation, an accelerated equivalent relationship between 2A12-T4 aluminum alloy plate accelerated corrosion and atmospheric corrosion is established. The results show that the fatigue life degradation law of 2A12-T4 aluminum alloy after accelerated pre-corrosion in laboratory is consistent with that of atmospheric pre-corrosion fatigue life degradation law, which is characterized by "rapid decline period"+"platform period".