The Permeability of Aluminum to Hydrogen

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Abstract
The permeability constant for hydrogen in aluminum at 500 °C was found to be sensitive to surface films. The constant varied over a four hundredfold range in normal hydrogen atmospheres and over a thousandfold range in the presence of a glow discharge. These differences are attributed to the varying ability of the respective surface films to catalyze the H2 ⇄ 2H equilibrium and to bar the diffusion of hydrogen. Surface films having high catalytic activity protect aluminum against attack by hydrogen generated in the reaction with water.

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