Characterization of acoustic emission generated during electrochemical charging and discharging of hydrogen in palladium
- Indira Ghandhi Centre for Atomic Research, Kalpakkam (India). Metallurgy and Materials Group
Acoustic emission technique (AET) is widely employed for detection and monitoring of crack initiation and growth in materials, components and structures, kinetics of deformation, diffusionless phase transformation, leak detection, real-time monitoring of corrosion process and structural damage caused by corrosion. The practical interest of this technique lies in its applicability for detection of stress corrosion cracking (SCC) and hydrogen embrittlement (HE) in high strength steels under service conditions. A systematic study on the evaluation of acoustic emission (AE) parameters for the assessment of hydrogen concentration during the process of hydrogen absorption and desorption is of significant interest. To the best of the authors` knowledge, such a study has not been carried out so far. During the process of hydrogen absorption, emission of acoustic waves is due to several reasons, viz., crack initiation and growth induced by hydrogen, evolution of hydrogen gas bubbles during electrochemical charging of hydrogen, the breakdown of oxide film present on the surface, the decohesion of second phase particles, plastic deformation etc. The phenomena associated with the absorption and desorption of hydrogen could also lead to detectable AE signals. A careful analysis of the AE signals generated during hydrogen charging and discharging would enable to gain insight into the absorption and desorption processes. Palladium is known to absorb/desorb hydrogen readily under ambient conditions. Hence, it has been chosen for the present investigation, in which an attempt has been made to correlate the AE parameters with the hydrogen absorption and desorption processes.
- OSTI ID:
- 611570
- Journal Information:
- Scripta Materialia, Vol. 38, Issue 4; Other Information: PBD: 13 Jan 1998
- Country of Publication:
- United States
- Language:
- English
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