Wasserstoffaufnahme von Armco Reineisen und L80 Ölfeldstahl unter verschiedenen Bedingungen

Translated title of the contribution: Hydrogen uptake of Armco pure iron and L80 oilfield steel under various conditions

Mathias Truschner

Research output: ThesisMaster's Thesis

222 Downloads (Pure)

Abstract

Armco iron and L80 steel (according to API 5CT) were charged under various conditions due to the lack of knowledge of the amount of hydrogen, which is absorbed during operation and laboratory charging. These two materials were charged in electrolytes with sodium chloride (NaCl), sulfuric acid (H2SO4), both with and without addition of thiourea (CH4N2S) and in H2S saturated NaCl/CH3COOH solution (NACE TM0177) at open circuit potential. Additionally, cathodic charging was done in sodium chloride and sulfuric acid, both with thiourea added at a current density of 1 mA/cm2. The charging time was between 2 and 336 hours for both methods. Prior to the charging the specimens were cleaned in acetone and the bulk hydrogen content of the two materials was determined. After charging, specimens were ground with silicone carbide paper (grit 120) and the hydrogen content was measured with a thermal conductivity cell after hot extraction at 950 °C. Most of the immersion tests at open circuit potential resulted in hydrogen concentrations of up to 1 wt.-ppm, while cathodic charging led to values of up to 4 wt.-ppm. In addition, the NACE TM0177 test provided the highest hydrogen concentrations and was the only test to show higher hydrogen concentrations for the Armco iron than for the L80 steel.
Translated title of the contributionHydrogen uptake of Armco pure iron and L80 oilfield steel under various conditions
Original languageGerman
QualificationDipl.-Ing.
Awarding Institution
  • Montanuniversität
Supervisors/Advisors
  • Trautmann, Anton, Co-Supervisor (internal)
  • Mori, Gregor Karl, Supervisor (internal)
Award date25 Oct 2019
Publication statusPublished - 2019

Bibliographical note

embargoed until null

Keywords

  • Hydrogen charging
  • Hydrogen Embrittlement
  • Thiourea
  • Hydrogen sulfide

Cite this