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A photoelectrochemical impedance spectroscopic study of passive metals

✍ Scribed by Albert Goossens; Digby D. Macdonald

Publisher
Elsevier Science
Year
1993
Tongue
English
Weight
381 KB
Volume
38
Category
Article
ISSN
0013-4686

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✦ Synopsis

A&rut-The phoroclecuocbcrnial impcdana of pa&e metals ir recorded in order IO explore coup ling bctwcea rhe chronic and ionic d& sIrucIura of passive oxide film% Square-wave modulated ur irradiation is used and ~bc -miIant modulated phobxunrnts arc rncasural from which a photo&ctrochunical impahcc an be derived by a hqxncy rcspo~~ analyzer. Since squarewave excitation i, used. ~bc applicability of linear response theory was explicitly certified by three independent procedures At present. two metal8 have been investigated, ie tungrten and zirconium. The photockclrochcmical impcdancc of passive WO, direr can be expkincd by assuming a rurfacc recombination mechanism. For 20, films, diffusion of m arricn arc raponsiblc for the obscrval low-frequency photocurrcn~ rrrponw.

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