Visualization of Cathode Activity for Fe-Rich and Cu-Rich Intermetallic Particles via Cathodic Corrosion from Dioxygen Reduction at Aluminum Alloy 2024-T3

Jesse C. Seegmiller, Reinaldo C. Bazito, Daniel A. Buttry

Research output: Contribution to journalArticle

18 Scopus citations

Abstract

A wall-jet flow cell was used to study O2 reduction at AA2024-T3. In buffered O2-saturated solution the current density was 2% of the diffusion-limited value and relatively stable with time. In unbuffered solution the current density was 25-50% of the diffusion-limited value. The higher currents under unbuffered conditions are attributed to production of OH- via O2 reduction at the intermetallic particles (IPs) at AA2024-T3. Trenching was observed around both Cu-rich and Fe-rich IPs. This cathodic corrosion was observed in the absence of chloride and when the alloy was held potentiostatically at open-circuit potential demonstrating that both types of IPs can act as cathodes toward O2 reduction under these conditions.

Original languageEnglish (US)
Pages (from-to)B1-B4
JournalElectrochemical and Solid-State Letters
Volume7
Issue number1
DOIs
StatePublished - Feb 9 2004
Externally publishedYes

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Materials Science(all)
  • Physical and Theoretical Chemistry
  • Electrochemistry
  • Electrical and Electronic Engineering

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