Self-protection of unsealed anodised aluminium exposed to atmosphere Abstract
DOI:
https://doi.org/10.3989/revmetalm.2005.v41.i2.197Keywords:
Aluminium, unsealed anodic films, self-sealing, electrochemical techniques, SEM, TEMAbstract
To confirm or refute the widely held idea that the sealing operation is vital to guarantee the good resistance of anodised aluminium to atmospheric corrosion, unsealed anodised specimens with three different film thicknesses were exposed in 9 atmospheres in Iberoamérica with salinity values of between 3.9 and 684 mg m sup>-2 day-1 of chlorides. Using a wide variety of techniques, from scanning and transmission electron microscopy to direct measurements by gravimetry, and including indirect measurements by electrochemical techniques as well as standard sealing quality control tests, the self-sealing capacity of unsealed anodic coatings during atmospheric exposure is demonstrated. Surprisingly, unlike other types of protective coatings, the quality of anodic films improves with ageing. Keywords
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