Formation of chromate conversion coatings on Al-Cu-Mg intermetallic compounds and alloys

W. R. McGovern, P. Schmutz, R. G. Buchheit, R. L. McCreery

Research output: Contribution to journalArticlepeer-review

75 Scopus citations


Chromium conversion coating (CCC) formation was monitored on copper-containing aluminum alloys AA2024-T3 and a specially cast AlxCuyMgz ingot using Raman spectroscopy of the 860 cm-1 band. The AlxCuyMgz ingot's different phases were compositionally analyzed with energy-dispersive spectroscopy (EDS) and Auger electron spectroscopy (AES) before and after treatments using commercial AlodineTM 1200S chromium solution. Profilometry and Raman intensity of the 860 cm-1 band were used to gauge CCC film thickness on AA-2024-T3 alloy. A linear relationship between CCC thickness and the integrated 860 cm-1 band was shown to exist on AA-2024 alloy. Raman intensity of the 860 cm-1 band was also integrated and spatially mapped using commercially available software. These results were verified with AES depth profiling using an Ar+ ion sputter. CCC formation was found to be slower on the AlxCuyMgz phases with higher copper content. Similarly, in 2024-T3, CCC formation was suppressed on S-phase Al2CuMg and `depressed' Al20Cu2FeMn intermetallics of 2024 aluminum alloy. Fe(CN)63-/4- adsorption on the AlxCuyMgz ingot phases, Cu, Al, Mg, and AA2024-T3 were characterized by Raman in the 2100 cm-1 range.

Original languageEnglish
Pages (from-to)4494-4501
Number of pages8
JournalJournal of the Electrochemical Society
Issue number12
StatePublished - Dec 2000

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Surfaces, Coatings and Films
  • Electrochemistry
  • Materials Chemistry


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