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Titolo:
Concentration transfer function of hydrogen diffusion in self-stressed metals
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: 512, anno: 2001,
pagine: 64 - 73
Fonte:
ISI
Lingua:
ENG
Soggetto:
AC-AV METHODS; ENTRY SIDE IMPEDANCE; ELECTROCHEMICAL METHODS; THEORETICAL-ANALYSIS; RESTRICTED DIFFUSION; PRESSURE MODULATION; ABSORPTION REACTION; BOUNDARY-CONDITIONS; PD81PT19 MEMBRANE; WIDE-RANGE;
Keywords:
hydrogen diffusion; stress; palladium and its alloys; transfer function; electrochemical impedance spectroscopy;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
53
Recensione:
Indirizzi per estratti:
Indirizzo: Zoltowski, P Polish Acad Sci, Inst Phys Chem, Ul Kasprzaka 44-52, PL-01224Warsaw, Poland Polish Acad Sci Ul Kasprzaka 44-52 Warsaw Poland PL-01224 nd
Citazione:
P. Zoltowski, "Concentration transfer function of hydrogen diffusion in self-stressed metals", J ELEC CHEM, 512(1-2), 2001, pp. 64-73

Abstract

The effects of self-stress on the concentration transfer function of hydrogen diffusion in a continuous elastic solid-metal matrix were analyzed. A large thin-plate metal specimen saturated with hydrogen is the essential part of the system. The equilibrium is perturbed by a small-magnitude sine-wave input signal of hydrogen concentration applied at one surface of the specimen. In response, oscillations of hydrogen concentration appear at the opposite surface. The concentration transfer function is defined as the ratio of the stationary response to input signals. The derived diffusion equations are non-linear. They are linearized, and then solved analytically. The resulting transfer function is discussed in terms of hydrogen permeation through a specimen of properties similar to palladium and Pd81Pt19 alloy, in wide ranges of hydrogen concentrations in the metal matrix and of frequenciesof the signal. At relatively high frequencies, the system is highly sensitive to non-Fickian diffusion, resulting from the non-local effect of self-stress. Transfer function spectroscopy seems to be a more powerful tool for studying the hydrogen transport in self-stressed metals than the commonly used transient break-through method. In particular, it should allow the dependence of the hydrogen diffusion coefficient and of the elastic modulus of metal-hydrogen solids on the hydrogen concentration to be studied. (C) 2001Elsevier Science B.V. All rights reserved.

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Documento generato il 31/03/20 alle ore 20:44:00