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在３０％酒石酸铵溶液中用恒定阳极电流测定阴极箔的计时电压（Ｅ－ｔ）曲线，根据曲线转折电压Ｅ转判断表面氧化膜相对厚度，发现膜厚与电容量有很好对应关系。用ｐＨ＝２磷酸钝化液处理的箔在刚生产出来时表面氧化膜很薄，随时间增厚，容量下降幅度大。改用ｐＨ＝３．４磷酸钝化液，形成的氧化膜较厚，较稳定，容量下降得到改善。对此作了分析探讨。
In a 30% ammonium tartrate solution, a constant anode current was used to measure the timing voltage (E-t) curve of the cathode foil. The relative thickness of the oxide film on the surface was determined according to the curve transition voltage E, and a good correspondence was found between the film thickness and the capacitance. The foil treated with a pH = 2 phosphoric acid passivating solution had a very thin surface oxide film just as it had been produced and had a large drop in capacity over time. Switch to pH = 3.4 phosphoric acid passivation solution, the formation of the oxide film thicker, more stable, decreased capacity to be improved. This article made an analysis and discussion.