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Electrochemical behaviour of aluminium in aqueous caustic solutions

✍ Scribed by O.R. Brown; J.S. Whitley

Publisher: Elsevier Science
Year: 1987
Tongue: English
Weight: 828 KB
Volume: 32
Category: Article
ISSN: 0013-4686
DOI: 10.1016/0013-4686(87)87040-8

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✦ Synopsis

The electrochemical behaviour of pure aluminium in aqueous KOH solutions has been examined by steady state and non-steady state techniques (impedance, potential pulse., potential scan). A surface free from oxide and hydroxide could not be established at any potential. The fall in the aluminium dissolution rate and the rise in the hydrogen evolution rate with decreasing electrode potential both arise from the thinning and hydration of the oxide layer. Decrease in alkalinity causes the film to thicken and to hydrate. In the nonsteady state the relatively slow changes in the oxide film lead to non-uniformity of composition and a consequent temporary s&ace roughening.

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