Effect of chloride ions on adsorption and permeation of hydrogen in iron
- Pennsylvania State Univ., University Park, PA (United States). Dept. of Materials Science and Engineering
- Cairo Univ. (Egypt). Chemistry Dept.
Effects of chloride ions on hydrogen absorption into iron and on the hydrogen evolution reaction (HER) on an iron surface were studied in acid and alkaline solutions at 23 C using the permeation method of Devanathan and Stachurski. Cl{sup {minus}} ions reduced the overpotential ({eta}) for HER and, in turn, reduced hydrogen coverage and permeation.Effects on hydrogen permeation were more pronounced in alkaline than in acid solutions. Permeation transients at constant electrode potential of he charging surface and subsequent surface analyses of the uppermost atom layers of the hydrogen-charged iron surface indicated a reversible or low coverage with Cl{sup {minus}} ions, a low hydrogen coverage that was not influenced significantly by Cl{sup {minus}} ion concentration at low {eta}, and a marked effect of Cl{sup {minus}} ions in reducing hydrogen coverage of the surface and permeability in alkaline solutions at high cathodic polarizations.
- Sponsoring Organization:
- Office of Naval Research, Washington, DC (United States); National Science Foundation, Washington, DC (United States)
- OSTI ID:
- 477470
- Journal Information:
- Corrosion, Journal Name: Corrosion Journal Issue: 4 Vol. 53; ISSN 0010-9312; ISSN CORRAK
- Country of Publication:
- United States
- Language:
- English
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