Abstract
The etching of high purity aluminum foils in hydrochloric acid under alternating current was investigated. Pit development and characteristics of etched foils were studied taking into account the a‐c amplitude, the frequency, the etching time, and the electrolyte temperature, using light micrography and scanning electron micrography. A maximum of electrical capacitance of etched and anodized foils is observed for certain frequency value ; and depend on the experimental conditions. The aluminum oxide formed on the metal etched surface exhibits minimum thickness for bath temperature near 60°C. Galvanodynamic voltammetry allows the determination of a pitting current and an induction time which depends on frequency. The pit density and the calculated anodic current efficiency for metal dissolution are found to decrease markedly with increasing frequency.
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