Non-electrolytic formation of Al-oxide surface layers by reversion of hydrotalcite

R. G. Buchheit, M. A. Martinez, L. P. Montes, N. P. Celia, S. R. Taylor, G. E. Stoner

Research output: Contribution to journalConference articlepeer-review


Polycrystalline hydrated aluminum oxide coatings with high corrosion resistance have been produced on AÎ alloys using non-toxic, non-electrolytic methods. These coatings are formed by a two stage process consisting of immersion in an alkaline Li-salt solution to form a hydrotalcite coating followed by immersion in boiling distilled water. Immersion in boiling water transforms the hydrotalcite to hydrated aluminum oxide (bayerite). This process has been termed "reversion". Reversion coatings can be formed in 30 minutes or less and exhibit corrosion resistances near that of anodized coatings. Reversion coating morphology, structure and composition are presented. The corrosion resistance of reversion coatings is compared to the corrosion resistance of coatings produced by Chromate conversion and electrolytic anodization.

Original languageEnglish
JournalNACE - International Corrosion Conference Series
StatePublished - 1998
EventCorrosion 1998 - San Diego, United States
Duration: Mar 22 1998Mar 27 1998

Bibliographical note

Funding Information:
This work was supportedb y a grantf rom theD efenseA dvancedR esearchP rojects Agency and SandiaN ationalL aboratories.S andiai s a multiprograml aboratoryo peratedb y SandiaC orporation,a Lockheed Martin Company,f or theU nited StatesD epartmenot f Energy underc ontractD E-Am-94AL85000.

Publisher Copyright:
© 1998 by NACE International.

ASJC Scopus subject areas

  • Chemistry (all)
  • Chemical Engineering (all)
  • Materials Science (all)


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