2A12-T4铝合金长期大气腐蚀损伤规律

doi:10.7527/S1000-6893.2014.0072

Abstract

Abstract:

Atmospheric corrosion tests on 2A12-T4 aluminum alloy are carried out in Wanning, Hainan province for 7 years, 12 years and 20 years. According to the difference of corrosion characteristics, corrosion regions are divided into one direction corrosion region and cross directions corrosion region. Using the minimum value of plate thickness as corrosion characteristic quantity, the minimum thicknesses of different regions on different specimens are measured, and a statistical study of the minimum thickness for these regions is carried out. The minimum values of plate thickness with reliability 99.9% and confidence 95% are obtained, and the confidence intervals of the minimum thickness with confidence 95% are determined. Furthermore, the corrosion damage morphologies of different regions on different specimens are studied by metallographic method. The results show that the corrosion characteristic quantity of 2A12-T4 in atmospheric corrosion environment is in conformity with normal distribution. The minimum thickness of 2A12-T4 plate decreases linearly from 7 years to 20 years. The 2A12-T4 is in a transition period of pitting to intergranular corrosion to exfoliation corrosion after 7 years atmospheric corrosion. Total exfoliation corrosion occurs on specimens exposed for 12 years, and severe exfoliation corrosion with pitting can be found on specimens exposed for 20 years. Compared with one direction corrosion region, cross directions region corrodes deeply and peels significantly.

Key words: aluminum alloys, aircraft structure, atmospheric corrosion, statistical analysis, kinetics law

CLC Number:

V252
TG171

ZHANG Teng, HE Yuting, GAO Chao, LI Changfan, SHAO Qing. Damage rule of 2A12-T4 aluminum alloy with long-term atmospheric corrosion[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2015, 36(2): 661-671.

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Damage rule of 2A12-T4 aluminum alloy with long-term atmospheric corrosion

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