Mechanism of anodic layer formation
Anodizing of aluminium and its alloys

Article REF: M1630 V4

Mechanism of anodic layer formation
Anodizing of aluminium and its alloys

Author : Jean-Sylvestre SAFRANY

Publication date: April 10, 2019 | Lire en français

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2. Mechanism of anodic layer formation

Electrolysis in an aqueous medium with direct current normally produces off-gassing at both electrodes (hydrogen at the cathode, oxygen at the anode). However, if aluminum is used as the anode, no off-gassing is observed at the anode, while hydrogen is always visible at the cathode.

To a first approximation, this phenomenon can be described as a combination of dissolved aluminium and nascent oxygen, according to the reaction :

\begin{array}{l} 2 Al + 3 O^{2 -} \to 6 e^{-} + {Al}_{2} O_{3} \end{array}

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Bibliography

(1) - SMELTZER (W.W) - Principles applicable to the oxidation and corrosion of metals and alloys. - Corrosion, vol. 11, 366 t-374 t (1995).
(2) - VARGEL (C.) - Corrosion de l'aluminium. - Éd. Dunod, p. 87 (1999).

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