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| EIS CHARACTERISTIC OF LY12CZ ALUMINIUM ALLOY WITH ALUMINIUM OVERLAYER UNDER ANODIC POLARIZATION IN 0.1mol/L NaCl SOLUTION |
| 天津大学材料学院 |
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Abstract 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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Received: 06 November 2006
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