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Titolo:
Diffusion of hydrogen in self-stressed metals - transfer function spectroscopy approach
Autore:
Zoltowski, P;
Indirizzi:
Polish Acad Sci, Inst Phys Chem, PL-01224 Warsaw, Poland Polish Acad Sci Warsaw Poland PL-01224 hys Chem, PL-01224 Warsaw, Poland
Titolo Testata:
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
fascicolo: 1-2, volume: 501, anno: 2001,
pagine: 89 - 99
Fonte:
ISI
Lingua:
ENG
Soggetto:
AC-AV METHODS; ELECTROCHEMICAL IMPEDANCE SPECTROSCOPY; ENTRY SIDE IMPEDANCE; THEORETICAL-ANALYSIS; PRESSURE MODULATION; ABSORPTION REACTION; BOUNDARY-CONDITIONS; PD81PT19 MEMBRANE; PERMEATION; PALLADIUM;
Keywords:
hydrogen diffusion; stress; palladium and its alloys; transfer function spectroscopy; electrochemical impedance spectroscopy;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
49
Recensione:
Indirizzi per estratti:
Indirizzo: Zoltowski, P Polish Acad Sci, Inst Phys Chem, Kasprzaka 44-52, PL-01224 Warsaw, Poland Polish Acad Sci Kasprzaka 44-52 Warsaw Poland PL-01224 oland
Citazione:
P. Zoltowski, "Diffusion of hydrogen in self-stressed metals - transfer function spectroscopy approach", J ELEC CHEM, 501(1-2), 2001, pp. 89-99

Abstract

The transfer function spectroscopy approach to the diffusion of hydrogen in a self-stressed isotropic elastic metal matrix is proposed. The system should be close to equilibrium. It is perturbed by a sine-wave input signal applied at one surface of the thin-plate specimen. The magnitude of this signal, of varied frequency, is small enough to treat the system as linear. The response signal is measured at the opposite surface of the specimen. The transfer function is the ratio of steady-state response to input signals. The hydrogen concentration and hydrogen flux are the input and output signals, respectively. The diffusion equations are derived, and they are served analytically. The resulting transfer function is discussed in terms of hydrogen permeation through a specimen of properties similar to palladium and Pd,,Pt,, alloy, in a wide range of hydrogen concentrations in the metal matrix. It is demonstrated that at relatively high frequencies the transfer function is highly sensitive to the non-Fickian diffusion, resulting from the non-local effect of self-stress. In contrast, at infinitesimally low frequency, i.e. at steady-state, both local and non-local effects compensate. Hence, the self-stress is absent. Under the proposed experimental conditions the transfer function spectroscopy is more appropriate for studying the diffusion, of hydrogen in self-stressed metals than the commonly used transient break-through method. It should allow the study of the diffusion coefficient of hydrogen in metals, and, moreover, of the elastic modulus of metal-hydrogen solids, both these quantities as function of hydrogen concentration in isotropic matrixes. (C) 2001 Elsevier Science B.V. All rights reserved.

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Documento generato il 05/04/20 alle ore 20:36:36