用电化学阻抗谱(EIS)研究了LY12CZ铝合金及包覆铝层后LY12CZ铝合金在0.1 mol/L NaCl溶液中的腐蚀破坏过程,根据两种条件下铝合金在不同极化电位下的EIS特征,建立与之相应的电化学等效电路模型,并分析了腐蚀机理｡研究表明,阳极极化过程中两种条件下铝合金的EIS主要特征类似,Nyquist图均呈现双容抗弧｡在点蚀发展过程中,包覆铝层的LY12CZ 铝合金的Nyquist图高,低频容抗弧半径增大,主要是因为包铝层与LY12CZ铝合金基体之间残存的氧化膜减缓了腐蚀的发展｡
The corrosion processes of LY12CZ aluminium alloy and LY12CZ with aluminium overlayer LB2 were studied by electrochemical impedance spectroscope (EIS) under anodic potential steps in 0.1 mol/L NaCl solution. According to the characteristics of EIS, the electrochemical equivalent circuit was established. The corrosion mechanisms of the two materials were further analyzed. The results show that the main EIS characteristics of the two materials are similar during the corrosion processes. Their Nyquist plots both consist of two capacitive arcs. During the pitting propagation of LY12CZ with aluminium overlayer, the radius of capacitive arcs in Nyquist plot increased temporarily, because the oxide films between in LY12CZ and aluminium overlayer inhibited the pitting propagation.
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