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根据弯梁法自制简易加载装置,结合电化学阻抗谱(EIS)测试方法,研究了民机蒙皮2024-T3铝合金在局部拉弯应力作用下浸泡于剥落腐蚀(EXCO)溶液中的剥蚀行为。结果表明,合金在发生剥蚀时,EIS中将出现2个时间常数。2024-T3铝合金加载试样的EIS在12h时出现2个时间常数,而未加载试样的EIS在12～24h之间才出现2个时间常数,且通过对比剥蚀过程中2种试样EIS的拟合数据,说明局部拉弯应力对2024-T3铝合金剥蚀的发生及发展具有促进作用。
According to the self-made simple loading device by bending beam method and the electrochemical impedance spectroscopy (EIS) test method, the erosion behavior of civil aircraft skin 2024-T3 aluminum alloy immersed in exfoliation corrosion (EXCO) solution under local tensile stress was studied. . The results show that there will be two time constants in the EIS during the denudation of the alloy. The EIS of 2024-T3 aluminum alloy sample shows two time constants at 12h, while the EIS of unloaded sample shows two time constants between 12 and 24h, and by comparing the EIS The results show that the local tensile and bending stresses have a positive effect on the occurrence and development of 2024-T3 aluminum alloy erosion.