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Updated: Mar 10, 2026

Measurement of Outgassing Rates of Steels
Published on: December 13, 2016
The effect of absorbed hydrogen on the dissolution of steel
Sebastian Thomas1, Noemie Ott2, Rebecca F Schaller3
1Department of Materials Science and Engineering, Monash University, Clayton, Victoria 3800, Australia.
Abstract:
Atomic hydrogen (H) was introduced into steel (AISI 1018 mild steel) by controlled cathodic pre-charging. The resultant steel sample, comprising about 1 ppmw diffusible H, and a reference uncharged sample, were studied using atomic emission spectroelectrochemistry (AESEC). AESEC involved potentiodynamic polarisation in a flowing non-passivating electrolyte (0.6 M NaCl, pH 1.95) with real time reconciliation of metal dissolution using on-line inductively coupled plasma-atomic emission spectroscopy (ICP-OES). The presence of absorbed H was shown to significantly increase anodic Fe dissolution, as evidenced by the enhanced detection of Fe2+ ions by ICP-OES. We discuss this important finding in the context of previously proposed mechanisms for H-effects on the corrosion of steels.
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