恒电量微扰法研究在含CI^-介质中Ce^(3+)对航空铝材的缓蚀作用

STUDIES ON THE INHIBITING ACTION OF Ce^(3+)TO ANIATION ALUMIMUM ALLOY IN AQUEOUS CHLORIDE SOLUTION BY COULOSTATIC PERTUB ATIONMETHOD

本文用恒电量微扰法研究了C33+对铝合金在0.1mol·1-1NaCI介质中的缓蚀机理及抗孔蚀性。结果表明：铝合金孔蚀诱导过程及其表面形成铈转化膜过程具有相同的电化学模式，电化学腐蚀速度控制步骤取决于钝化膜（转化膜）／溶液界面过程。Ce3+对铝金孔蚀的诱导期和发展期均有抑制作用，形成铈转化膜后，铝基表面阻抗大大提高，耐孔蚀性增强。

In this paper the inhibiting function and its mechanism of the Ce3+ ion to the pitting corrosion on LY12CZ aluminium alloy in 0.1mol·1-1 NaCl solution were studied by coulostatic pertubation method. The results of research show that the process of the pitting induction and the formation of cerium conversion film on aluminium alloy surface have similar electrochemical model. The rate controlling step of the electrochemical corrosion was the interface process of passivation layer (or conversion film) and solution. The Ce3+ could inhibit the pitting induction and developing process of the alluminium alloy. After the cerium comversion film formed, the electrical impedance on the surface of aluminium alloy would increase and the anticorrosion will enhance.