Inhibition of O2 reduction on intermetallic particles at the surface of AA2024 by adsorbed phosphonates

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

Research output: Contribution to journalArticle

Abstract

Aluminum alloys are important technological materials with applications in many areas because of their light weight and high strength. However, the presence of intermetallic particles (IPs) on the surface of these alloys makes them susceptible to corrosion. We have recently shown that O2 reduction at these IPs causes the local production of OH-, which etches the natural oxide layer around the IP and starts the corrosion process. In this paper we describe the adsorption of various phosphonates at the surface of AA2024 and their inhibitory effect toward the reduction of O2. Both rotating disk and wall-jet voltammetry are used to demonstrate a reduction in O2 cathodic current density from adsorbed phosphonates of two orders of magnitude.

Original languageEnglish (US)
Pages (from-to)545-554
Number of pages10
JournalCorrosion Reviews
Volume25
Issue number5-6
DOIs
StatePublished - Jan 1 2007

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ASJC Scopus subject areas

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

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