Fluctuations of permeation rate through an iron membrane induced by hydrogen bubbles
- Ecole Centrale de Paris, Chatenay-Malabry (France)
- Univ. Pierre et Marie Curie, Paris (France)
Using the electrochemical permeation technique, the authors have recorded fluctuations of the concentration of absorbed hydrogen in an Armco iron membrane during cathodic hydrogen charging in acidic solution. The fluctuations coincide quite closely with the dynamics of hydrogen bubbles at the cathode surface, which were followed both visually and by recording cathode-potential and ohmic-resistance fluctuations. The local flux of hydrogen into the iron membrane gradually decreased when there is an attached bubble growing and quickly increases when the bubble departs. An excellent correlation was found between the fluctuations of the concentration of absorbed hydrogen in the first layers of metal and the fluctuations of the cathode potential.
- OSTI ID:
- 6970491
- Journal Information:
- Journal of the Electrochemical Society; (United States), Journal Name: Journal of the Electrochemical Society; (United States) Vol. 141:8; ISSN JESOAN; ISSN 0013-4651
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360104 -- Metals & Alloys-- Physical Properties
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400400* -- Electrochemistry
BUBBLES
CONCENTRATION RATIO
DIFFUSION
ELECTRIC POTENTIAL
ELECTROCHEMICAL CELLS
ELEMENTS
HYDROGEN
IRON
METALS
NONMETALS
PERMEABILITY
TRANSITION ELEMENTS