The hydrogen overpotential of pure and impure aluminum in 0.1 N H2SO4 at 25° has been studied. The effect of the autocorrosion of the metal has been interpreted and the role of impurities in determining the overpotential and the rest potential has been shown. As well, the build-up and decay of the overpotential has been studied; the behavior is much more complicated than that of noble metals.
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Hansen et al. (1956) studied this question.
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