Hydrogen sorption and desorption properties of Pd-alloys and steels investigated by electrochemical methods and mass spectrometry

Anna Uluc

Research output: ThesisDissertation (TU Delft)

21 Downloads (Pure)

Abstract

Although it has been more than a century since the first known hydrogen embrittlement case was reported, the fundamental question regarding its mechanism is still open to debate. Understanding the hydrogen-metal interactions is of great importance in tailoring microstructures that will have excellent mechanical properties while still resisting hydrogen embrittlement. This is because microstructure and composition affect the thermodynamic and mechanical stability of a material in the presence of hydrogen, as well as the kinetics of processes such as crack propagation, and absorption, desorption and diffusion of hydrogen.
So far, thermal desorption spectroscopy has been widely used in investigating hydrogen traps present in alloys. This method is well-established in identifying binding energies of traps with hydrogen. Mechanical testing, on the other hand, provides a direct assessment of embrittlement but cannot determine trap types or the amount of hydrogen in the material. A direct observation of the material can be provided by in-situ TEM, where evidence of the effect of hydrogen on fracture behavior and dislocation pile-ups is given.
In order to complement the above-mentioned methods, in this work a non-destructive, fast and easy method is presented that can be used for screening the hydrogen uptake of alloys. An electrochemical method based on cyclic voltammetry (CV) is used to investigate the hydrogen absorption and desorption of different materials. The method is very useful in quantifying small amounts of hydrogen.
Original languageEnglish
Awarding Institution
  • Delft University of Technology
Supervisors/Advisors
  • Thijsse, B.J., Supervisor
  • Bottger, A.J., Advisor
Award date24 Nov 2015
Print ISBNs978-94-6233-171-6
DOIs
Publication statusPublished - 2015

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