Premium
Inhibitors of passive corrosion – application of a new test with thin oxide films
Author(s) -
Lohrengel M. M.,
Schubert K.,
Schultze J. W.
Publication year - 1981
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.19810320104
Subject(s) - oxide , corrosion , adsorption , layer (electronics) , benzimidazole , corrosion inhibitor , oxygen , molecule , chemistry , ion , inorganic chemistry , materials science , chemical engineering , organic chemistry , engineering
Abstract A new method to test the inhibitors of passive corrosion is presented. Potentiodynamic i(ε)‐ and C(ε)‐curves are recorded in the system Au/Fe 2+ , inhibitor. The investigations of formation and reduction of the FeOOH‐layer, of gold oxide and the oxygen evolution allow estimations of the inhibition efficiency and mechanism. Some organic nitrogencompounds are tested. Pentylamine is ineffective for oxide surfaces, but benzimidazole and its derivates show inhibition effects. The capacity data can be evaluated using a condensor model of a connection in series of the oxide and the inhibitor layer. The detailed discussion shows that adsorption at the film surface is most probable. Such layers inhibite the transfer of hydrated ions, but reactions of water molecules are not influenced, e.g. oxygen evolution. The applicability of this method to other systems is discussed.