| Numéro |
J. Phys. Colloques
Volume 42, Numéro C5, Octobre 1981
ICIFUAS-7Seventh International Conference on Internal Friction and Ultrasonic Attenuation in Solids |
|
|---|---|---|
| Page(s) | C5-121 - C5-125 | |
| DOI | https://doi.org/10.1051/jphyscol:1981518 | |
Seventh International Conference on Internal Friction and Ultrasonic Attenuation in Solids
J. Phys. Colloques 42 (1981) C5-121-C5-125
DOI: 10.1051/jphyscol:1981518
RAYLEIGH WAVE STUDIES OF CATHODIC H-CHARGING OF Fe
E. Lunarska1 et N.F. Fiore21 Institute of Physical Chemistry, Polish Academy of Sciences, Warsaw, Poland
2 Department of Metallurgical Engineering and Materials Science, University of Notre Dame, Notre Dame, IN 46556, U.S.A.
Abstract
The attenuation of 2-6 MHz Rayleigh waves /RW/ was measured in sheet samples of Fe which were undergoing electrolytic charging with H. The cathodic polarization and As2O3 addition into electrolyte were found to effect the attenuation and velocity of the surface waves. The attenuation changes were retarded by the deposition of a thin /2µm/ layer of Cu on the Fe surface, with the Cu acting as a H-permeation barrier. The decrease in attenuation was caused by the entry of H into solid solution at the surface region. The mechanism of attenuation decrease appears to be associated with the decrease of dislocations mobility in the near-surface region by H-atoms. The long time polarization caused by RW attenuation to increase due to the formation of H-induced blisters on or immediately below the sample surface.