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。
The instantaneous impedance of Al in 1N NaCl at various polarization times has been measured using Laplace transformation method.In the instan of beginning of polarization,the dependence of interfacial resistance R,on polarization current densitg i_p,is as follows: logR_f=K-logi_p Interfacial capacitance Cf,which is independent of i,depends only on film's thickness.In the course of polarization,R_f hardly changes with time, but C_f changes greatly This is due to the fact that the difference between electric resistance on corroded region and that on film region is very small while there is a large difference in capacitance of both regions.
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