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Conference Paper

Detection of Hydrogen Ingress into Iron Oxide and Iron Oxy-Hydroxide Layers by the Kelvin Probe

MPS-Authors
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Krasemann,  Markus
Physical Metallurgy, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;

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Streckel,  Heinz
Physical Chemistry, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;

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Hoffmann,  Kornelia
Physical Chemistry, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;

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Grabke,  Hans-Jürgen
Physical Chemistry, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;

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Stratmann,  Martin
Physical Chemistry, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;

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Citation

Krasemann, M., Streckel, H., Hoffmann, K., Grabke, H.-J., & Stratmann, M. (1998). Detection of Hydrogen Ingress into Iron Oxide and Iron Oxy-Hydroxide Layers by the Kelvin Probe. In P. M. Natishan, H. S. Isaacs, M. Janik Czachor, V. A. Macagno, P. Marcus, & M. Seo (Eds.), Proceedings of the Symposium on Passivity And its Breakdown (pp. 207-220).


Cite as: https://hdl.handle.net/11858/00-001M-0000-0019-7363-A
Abstract
Hydrogen embrittlement is a serious problem in iron-containing alloys. The hydrogen ingress through passive and oxide layers covering these alloys is not yet fully understood. Therefore, a new method was developed to follow hydrogen ingress into iron oxide layers. It was shown experimentally that the Kelvin probe can be used as a measuring method to follow the reduction of iron oxides due to hydrogen ingress. The measured results were interpreted on the basis of theoretical considerations which relate the measured decay in Volta-potential-difference with the concentration of iron ions inside the oxides.