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The binding of phosphonic acids at aluminium oxide surfaces and correlation with passivation of aluminium flake.

Authors
  • Cooper, Rachel J
  • Camp, Philip J
  • Henderson, David K
  • Lovatt, Paul A
  • Nation, David A
  • Richards, Stuart
  • Tasker, Peter A
Type
Published Article
Journal
Dalton transactions (Cambridge, England : 2003)
Publication Date
Apr 07, 2007
Issue
13
Pages
1300–1308
Identifiers
PMID: 17372645
Source
Medline
License
Unknown

Abstract

Measurements of adsorption isotherms of a series of thirteen mono- and di-phosphonic acids have shown that these bind strongly to the surface of high surface area aluminium trihydroxide. The incorporation of such phosphonates into a suspension of aluminium flake in an aqueous medium, modelling the continuous phase of a water-based paint, greatly suppresses the evolution of hydrogen. Whilst strong binding of the phosphonate to aluminium oxides is an essential criterion for good passivation, other factors such as the hydrophobicity of the ligand are also important in suppressing hydrogen-evolution.

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