The Difference Effect on Aluminum Dissolving in Hydrofluoric and Hydrochloric Acids
- 1 January 1955
- journal article
- Published by The Electrochemical Society in Journal of the Electrochemical Society
- Vol. 102 (6) , 304-310
- https://doi.org/10.1149/1.2430052
Abstract
The positive difference effect was observed during dissolution of high purity aluminum coupled with platinum in 0.05, 0.1, 0.25, 0.5, 0.75, 1.0, and 2.0 hydrofluoric acid at 25°C. The effect was directly proportional to the galvanic current up to 60 ma/cm2, being nearly independent of the concentration of the acid. The proportionality constant, K, was 5.31, corresponding to a polarizability of 77% for the aluminum in hydrofluoric acid.Keywords
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