Electrochemistry of θ (Al2Cu), S (Al2CuMg) and T1 (Al2CuLi) and localized corrosion and environment assisted cracking in high strength Al alloys

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9 Scopus citations


The θ (Al2Cu), S (Al2CuMg), and T1 (Al2CuLi) intermetallic constituents and precipitates found in age-hardenable aluminum alloys play important roles in the localized corrosion behavior of Al-Cu-(Mg,Li) alloys. Most of the common understanding of the behavior of these phases is based on knowledge or assumptions of their open circuit potentials (OCP). Electrochemical measurements made on these compounds synthesized in bulk form, and detailed investigations of their dissolution from alloys reveal interesting complexities not suggested by OCP measurements. Studies show that both anodic and cathodic reaction kinetics are very fast on these intermetallics. These compounds invariably corrode by dealloying in which the more active Al, Mg, or Li components dissolve to leave behind a Cu-enriched particle remnant. The dealloyed particle remnants are themselves physically unstable and have been observed to coarsen and emit 10 to 100 nm metallic Cu clusters into corrosion product layers and surface films. Overall, a more complete and quantitative understanding of the dissolution characteristics of these intermetallic compounds has helped in understanding localized corrosion and environment assisted cracking behavior of Al alloys.

Original languageEnglish
Pages (from-to)II/-
JournalMaterials Science Forum
StatePublished - 2000
EventThe 7th International Conference ICCA7 - 'Aluminium Alloys: 'Their Physical and Mechanical Properties' - Charlottesville, VA, USA
Duration: Apr 9 2000Apr 14 2000

ASJC Scopus subject areas

  • Materials Science (all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering


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