| Summary: | 碩士 === 國立中央大學 === 機械工程研究所 === 91 === Abstract
The rare elements contained in the high purity aluminum foils have significant influence during the aluminum foils etched process. In the thesis, the electrochemical behavior changed by different kinds and quantity of rare elements in the high purity aluminum foils used in the low voltage electrolytic capacitor has been studied.
There are eight kinds of samples use in the experiment. The foils were electrochemically etched at 50 Hz sinusoidal wave alternating current in HCl solution. The etched foils were formed at 20 Voltage in ammonium adipate solution and capacitance was measured by EIAJ specifications. For surface and cross section morphology studies, the samples were examined in the SEM and OM, respectively. The galvanostatic cyclic voltammetry method was applied to obtain the voltage-current curves by using the potentiostats/galvanostats. From the observation of etched microstructure and the electrochemical analysis, the effect and behavior of rare elements in the high purity aluminum foils during the etching process could be studied in detail.
In the results of the experiment, it was found that the growing up methods of the porous layer were different with the rare elements in the hight purity aluminum foils. The density of the porous was changed with the kinds and quantity of rare elements in the high purity aluminum foils. By this way, large pits、sawtooth interface、line interface may be appear in the porous layer to effect the capacitance.
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