Anodic dissolution of high purity aluminum in acidic solutions.
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概要
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The passivation behavior of high purity aluminum and the property of surface film in deaerated acidic distilled water were studied using a potentiostat. The anodic polarization curves show that the limiting current density is independent of pH and the concentration of Cl-. The measurement of half-time of potential decay shows that the most stable film is formed at -600 mV. The time variation of current density shows that the film growth is resulted from migration and diffusion of Al3+ through the film. The activation energy of anodic current at -1250 mV is approximately 9 kcal/mol and is approximately 1.2 to 1.7 kcal/mol at potentials in a limiting current region. These low values of activation energy in the limiting current region are explained. Both the stabilization of film by polymerization and dehydration and the dissolution rate of film are accerelated at elevated temperatures. These two processes reversely contribute to the limiting current density.
- 一般社団法人 軽金属学会の論文
一般社団法人 軽金属学会 | 論文
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