The Basics of Hydrogen Uptake in Iron and Steel

Titel in Übersetzung: Die Grundlagen der Wasserstoffaufnahmen in Eisen und Stahl

Mathias Truschner, Anton Trautmann, Gregor Karl Mori

Publikation: Beitrag in FachzeitschriftArtikelForschungBegutachtung


Armco iron and L80 steel (according to API 5CT) were charged under various conditions due to often not knowing the exact amount of hydrogen absorbed during operation and laboratory charging. These two materials were charged in sodium chloride (NaCl), sulfuric acid (H2SO4), both with and without addition of thiourea (CH4N2S), and in H2S (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 h 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, the specimens were ground with a silicone carbide paper 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 the 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 Armco iron than for L80 steel.
Titel in ÜbersetzungDie Grundlagen der Wasserstoffaufnahmen in Eisen und Stahl
Seiten (von - bis)443-449
FachzeitschriftBerg- und hüttenmännische Monatshefte : BHM
PublikationsstatusVeröffentlicht - 10 Sept. 2021

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