Electrochemical characterization of the permeability and the loss of adhesion 
of Plasma-polymerized hexafluoropropene films on platinum

Kavan, Ladislav; Doblhofer, Karl

doi:10.1002/maco.19910420605

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Electrochemical characterization of the permeability and the loss of adhesion of Plasma-polymerized hexafluoropropene films on platinum

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Doblhofer, Karl
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Citation

Kavan, L., & Doblhofer, K. (1991). Electrochemical characterization of the permeability and the loss of adhesion of Plasma-polymerized hexafluoropropene films on platinum. Materials and Corrosion - Werkstoffe und Korrosion, 42(6), 309-316. doi:10.1002/maco.19910420605.

Cite as: https://hdl.handle.net/21.11116/0000-000A-5AFC-6

Abstract

Plasma-polymerized hexafluoropropene films on platinum electrodes are studied as a model system for hydrophobic organic protective coatings on metals. The loss of adhesion of the films in aqueous H₂SO₄ is determined from the time-dependent impedance, from the rate of charge-transfer reactions, and from the Pt-H adsorption charge of the coated electrodes. It is shown that hydrogen leads to fast splitting of the platinum-polymer bonds. The permeability of the films for H₂, O₂, and Fe^2+/3+ is determined by measuring the rates of electrochemical oxidation or reduction of these species on the coated electrodes in different states of delamination.