Thermal Desorption Spectroscopy Study on the Hydrogen Trapping States in a Pure Aluminum

Abstract

Hydrogen trapping states in pure aluminum foils with 99.99% purity with different amount of blisters have been investigated by means of thermal desorption spectroscopy. Three peaks are seen in the spectra, where the amount of hydrogen from the third peak at the highest temperature range increases with increasing in the volume fraction of the blisters. Hence, the third peak is revealed to arise from the hydrogen in the blisters. The desorption energy of hydrogen released from the blisters is 76.3 kJ/mol. On the other hand, the first peak is inferred to be due to the hydrogen diffusing with vacancy, considering the diffusion distance of the vacancy as well as untrapped hydrogen atom.

Hydrogen behavior in Al Cr alloys: Synchrotron-based photoelectron microscopy of the rapidly solidified structure

“…1). This result strongly suggests that there is an unknown, most likely irreversible trap state in the foils of both pure Al and AleCr alloy with binding energy higher than that of the pores regarded as the strong H trap site in aluminum materials [3,25,26]. Indeed, the TDA peak appearing at 400 C in Al and its alloy (Fig.…”

Analysis of Hydrogen Trapping by Gaussian Distribution for Normalized Carbon Steels

“…11,26) Their measured curves were well separated or had already separated tops. In contrast, present separation works for continuous and smooth desorption curves.…”

Ultra high vacuum high precision low background setup with temperature control for thermal desorption mass spectroscopy (TDA-MS) of hydrogen in metals

“…Total hydrogen amount A H2 , detected during the experiment in time interval t 2 À t 1 for a defined molecular conversion factor K, hydrogen pumping rate and sample volume V s can be calculated [27] as follows:…”