Numerical modeling of thermal desorption spectra of hydrogen; A Review of thermal desorption models

Ebihara, Kenichi   ; Kaburaki, Hideo

In the study of hydrogen embrittlement, it is indispensable to identify the hydrogen trapping state in steels. The hydrogen thermal desorption profile, which is obtained from the thermal desorption analysis (TDA) and is the relation between temperature and the amount of desorbed hydrogen of a specimen heated at a constant rate, is effective. Since various factors such as the specimen size, the heating rate, the hydrogen diffusion and the trapping effect of defects affect the desorption profile, however, it is necessary to model the process of the hydrogen desorption from the specimen. This paper reviewed the present model which can simulate the desorption profile by categorizing them according to the rate-determining process of the hydrogen desorption. The historical background and the range of validity of the models were also mentioned.