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Electrochemical characterization of the permeability and the loss of adhesion of Plasma‐polymerized hexafluoropropene films on platinum
Author(s) -
Kavan Ladislav,
Doblhofer Karl
Publication year - 1991
Publication title -
materials and corrosion
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.487
H-Index - 55
eISSN - 1521-4176
pISSN - 0947-5117
DOI - 10.1002/maco.19910420605
Subject(s) - platinum , electrochemistry , materials science , electrode , aqueous solution , adsorption , polymerization , polymer chemistry , plasma polymerization , polymer , chemical engineering , chemistry , composite material , organic chemistry , catalysis , engineering
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 H 2 SO 4 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 H 2 , O 2 , 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.