Chromate-free corrosion resistant conversion coatings for aluminum alloys

R. G. Buchheit, C. A. Drewein, M. A. Martinez, G. E. Stoner

Research output: Contribution to conferencePaperpeer-review

4 Scopus citations


Inorganic polycrystalline hydrotalcite, Li2[Al2(OH)6]2·CO3·3H2O, coatings can be formed on aluminum and aluminum alloys by exposure to alkaline lithium carbonate solutions. This process is conducted using methods similar to traditional chromate conversion coating procedures, but does not use or produce toxic chemicals. The coating provides anodic protection and delays the onset of pitting during anodic polarization. Cathodic reactions are also inhibited which may also contribute to corrosion protection. Recent studies have shown that corrosion resistance can be increased by sealing hydrotalcite coated surfaces to transition metal salt solutions including Ce(NO3)3, KMnO4 and Li2MoO4. Results from these studies are also reported.

Original languageEnglish
Number of pages10
StatePublished - 1995
EventProceedings of the 1995 124th TMS Annual Meeting - Las Vegas, NV, USA
Duration: Feb 13 1995Feb 16 1995


ConferenceProceedings of the 1995 124th TMS Annual Meeting
CityLas Vegas, NV, USA

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys


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