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Electronic properties of oxide layers on Fe20Cr in comparison with Fe
Author(s) -
König U.,
Meisterjahn P.,
Schultze J. W.
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.19910420406
Subject(s) - quantum tunnelling , limiting , dissolution , resonance (particle physics) , space charge , oxide , electron , anode , materials science , cathodic protection , charge (physics) , electronic structure , chemistry , electron transfer , analytical chemistry (journal) , atomic physics , electrode , optoelectronics , physics , computational chemistry , metallurgy , mechanical engineering , chromatography , engineering , quantum mechanics
Abstract The electronic properties of passive layers on Fe20Cr were examined at pH 8.4 by C(U)‐ and ETR‐measurements and compared with the experiments on Fe. The behaviour of both systems can be explained with the same models. This means, that electronic models which were developed for passive layers on Fe can be transferred to the passive layers on Fe20Cr. The band structure must be modified by surface charge due to the transpassive dissolution of Cr. The cathodic ET‐reaction is determined by the tunnelling through the space charge layer at potentials close to U fb . The anodic electron transfer reaction is controlled by a Poole‐Frenkel effect for both systems, where the rate limiting step is the transport between the resonance centres, which are given by the donor concentration N D .