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

Rachel J. Cooper; Philip J. Camp; David K. Henderson; Paul A. Lovatt; David A. Nation; Stuart Richards; Peter A. Tasker

doi:10.1039/B617599F

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Dalton Transactions

Issue 13, 2007

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

Rachel J. Cooper , Philip J. Camp , David K. Henderson , Paul A. Lovatt , David A. Nation , Stuart Richards and Peter A. Tasker

Dalton Trans., 2007, 1300-1308

DOI: 10.1039/B617599F
Received 06 Dec 2006, Accepted 30 Jan 2007
First published on the web 13 Feb 2007

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Abstract
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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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Adsorption isotherm and hydrogen-evolution data.
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Articles By

Rachel J. Cooper
Philip J. Camp
David K. Henderson
Paul A. Lovatt
David A. Nation
Stuart Richards
Peter A. Tasker

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Dalton Transactions

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

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