2016 CAP Congress / Congrès de l'ACP 2016

Detection of hydrogen in steel with an N-15 nuclear resonance

15 Jun 2016, 14:15

15m

Colonel By B205 (University of Ottawa)

Oral (Student, In Competition) / Orale (Étudiant(e), inscrit à la compétition) Condensed Matter and Materials Physics / Physique de la matière condensée et matériaux (DCMMP-DPMCM) W2-5 Thin Films II (DCMMP-DSS) / Couches minces II (DPMCM-DSS)

Speaker

Jean-Simon Larochelle (Université de Montréal)

Description

We have used a 6.38 MeV N-15 nuclear resonance to detect hydrogen in steel that had been electroplated with a protective Cd surface coating. With the sample maintained at room temperature, we observed a rapid decline in hydrogen concentration during the measurement, indicative of beam-induced hydrogen detrapping and mobility. It appears that the hydrogen concentration falls off as a simple exponential decay with ion fluence, however it settles at a finite hydrogen concentration different from 0. In spite of the hydrogen loss, we have been able to detect small concentrations of hydrogen which has diffused into the bulk of the steel sample. We also studied in more detail the temperature dependence and aysmptotic behaviour of the hydrogen loss and will report on these studies.