Characterization of Zr(IV)-Phosphonate Thin films which inhibit O 2 reduction on AA2024-T3

Eric J. Dufek, Daniel Buttry

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Zr(IV)-alkyl-phosphonate and Zr(IV)-aryl-phosphonate thin films of varying compositions were investigated for corrosion inhibition capabilities on AA2024-T3. A strong correlation between the alkyl chain length and the ability of these self-assembled systems to inhibit the O 2 reduction reaction at the alloy surface was found. In particular, modification using Zr(IV)-octadecyl-phosphonate initially inhibits O 2 reduction currents by more than 2 orders of magnitude in 0.1 M Na 2 SO 4 at a potential of -0.80 V vs a saturated calomel electrode and by greater than 95% after 5500 s under similar conditions. Scanning electrochemical microscopy reveals uniform inhibition of cathodic processes. Auger electron spectroscopy confirms the presence of Zr and P in the thin film. Infrared reflection-absorption spectroscopy indicates that the alkyl chains are in a liquidlike environment. Long-term testing of the Zr(IV)-octadecyl-phosphonate system in a sulfate-containing solution yields low levels of surface activation, as evidenced by small amounts of trenching adjacent to intermetallic particles and little change in near-surface Cu content.

Original languageEnglish (US)
JournalJournal of the Electrochemical Society
Volume156
Issue number9
DOIs
StatePublished - 2009

Fingerprint

Organophosphonates
Thin films
thin films
Trenching
infrared reflection
Auger electron spectroscopy
Absorption spectroscopy
Chain length
Auger spectroscopy
Intermetallics
intermetallics
electron spectroscopy
sulfates
corrosion
Microscopic examination
absorption spectroscopy
Chemical activation
activation
Corrosion
Sulfates

ASJC Scopus subject areas

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

Cite this

Characterization of Zr(IV)-Phosphonate Thin films which inhibit O 2 reduction on AA2024-T3. / Dufek, Eric J.; Buttry, Daniel.

In: Journal of the Electrochemical Society, Vol. 156, No. 9, 2009.

Research output: Contribution to journalArticle

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