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采用拉普拉斯变换交流阻抗测量方法,测量了铝在 NaCl 溶液中阳极极化后的瞬时阻抗。极化刚开始的瞬间,表面膜尚未受破坏,此时界面电阻(R_界)与极化电流密度(i_P)的关系为:logR_界=K-logi_P 界面电容(C_界)则与 i_P 无关,主要取决于膜厚。极化开始以后,R_界随时间变化不大,C_界则变化很大。这是由于溶解区电阻与有膜区电阻相差不大,而溶解区电容与有膜区电容相差较大。将铝在空气中形成的钝化膜看作半导体膜,所导出的结论与试验结果符合很好。
Laplace transform AC impedance measurement was used to measure the instantaneous impedance of aluminum after anodic polarization in NaCl solution. At the beginning of the polarization, the surface film has not yet been damaged. The relationship between the interface resistance (R_degree) and the polarization current density (i_P) at this moment is: logR_degree = K_logi_P The interface capacitance (C_end) i_P has nothing to do, mainly depends on the film thickness. After the beginning of polarization, R_ bound little change with time, C_ bound to change greatly. This is due to dissolution zone resistance and the membrane resistance is not much difference, while the dissolved area capacitance and capacitance of the membrane area is quite different. The passivation film formed by aluminum in the air is regarded as a semiconductor film, and the conclusions drawn are in good agreement with the experimental results.