Determination of the hydrogen fugacity during cathodic hydrogen charging of X65 D pipeline steel

Abstract:

Hydrogen embrittlement testing using cathodic hydrogen charging is directly relatable to structures containing gaseous hydrogen if the hydrogen fugacity is known. The hydrogen fugacity, f<inf>Hc</inf>, was evaluated by comparing the hydrogen concentration after cathodic charging with the hydrogen concentration in equilibrium with hydrogen gas: f<inf>Hc</inf>^0.5 = 6.11 i^0.5 + 10.9 for cathodic hydrogen charging X65 D in 0.10 M NaOH at a current density of i. The hydrogen concentration in equilibrium with gaseous hydrogen in X65 D, C<inf>Hg</inf>, was evaluated from literature values and hydrogen gas-phase permeation results: C<inf>Hg</inf> = 0.0062f<inf>Hg</inf>^0.5 + 0.0355, where f<inf>Hg</inf> is the hydrogen gas fugacity.

Año de publicación:

2025

Keywords:

• Cathodic hydrogen charging
• hydrogen embrittlement (HE)
• Hydrogen permeation
• Hydrogen solubility
• pipeline steel
• Thermal desorption spectroscopy (TDS)

Fuente:

scopus