FLUCTUATIONS OF PERMEATION RATE THROUGH AN IRON MEMBRANE INDUCED BY HYDROGEN BUBBLES

Citation
Z. Amrani et al., FLUCTUATIONS OF PERMEATION RATE THROUGH AN IRON MEMBRANE INDUCED BY HYDROGEN BUBBLES, Journal of the Electrochemical Society, 141(8), 1994, pp. 2059-2061
Citations number
10
Categorie Soggetti
Electrochemistry
ISSN journal
00134651
Volume
141
Issue
8
Year of publication
1994
Pages
2059 - 2061
Database
ISI
SICI code
0013-4651(1994)141:8<2059:FOPRTA>2.0.ZU;2-M
Abstract
Using the electrochemical permeation technique, we have recorded fluct uations of the concentration of absorbed hydrogen in an Armco iron mem brane during cathodic hydrogen charging in acidic solution. The fluctu ations coincide quite closely with the dynamics of hydrogen bubbles at the cathode surface, which were followed both visually and by recordi ng cathode-potential and ohmic-resistance fluctuations. The local flux of hydrogen into the iron membrane gradually decreases when there is an attached bubble growing and quickly increases when the bubble depar ts. An excellent correlation was found between the fluctuations of the concentration of absorbed hydrogen in the first layers of metal and t he fluctuations of the cathode potential.