Self-protection of unsealed anodised aluminium exposed to atmosphere Abstract

Authors

  • E. Escudero Centro Nacional de Investigaciones Metalúrgicas (CENIM)
  • M. J. Bartolomé Centro Nacional de Investigaciones Metalúrgicas (CENIM)
  • V. López Centro Nacional de Investigaciones Metalúrgicas (CENIM)
  • J. Simancas Centro Nacional de Investigaciones Metalúrgicas (CENIM)
  • J. A. González Centro Nacional de Investigaciones Metalúrgicas (CENIM)
  • M. Morcillo Centro Nacional de Investigaciones Metalúrgicas (CENIM)
  • E. Otero Centro Nacional de Investigaciones Metalúrgicas (CENIM)

DOI:

https://doi.org/10.3989/revmetalm.2005.v41.i2.197

Keywords:

Aluminium, unsealed anodic films, self-sealing, electrochemical techniques, SEM, TEM

Abstract


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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Published

2005-04-30

How to Cite

Escudero, E., Bartolomé, M. J., López, V., Simancas, J., González, J. A., Morcillo, M., & Otero, E. (2005). Self-protection of unsealed anodised aluminium exposed to atmosphere Abstract. Revista De Metalurgia, 41(2), 133–138. https://doi.org/10.3989/revmetalm.2005.v41.i2.197

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