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Scanning Kelvin Probe Investigation of High-Strength Steel Surface after Impact of Hydrogen and Tensile Strain
RISE Research Institutes of Sweden, Material och produktion, Korrosion. (Institut de la Corrosion)
RISE Research Institutes of Sweden, Material och produktion, Korrosion. (Institut de la Corrosion)ORCID-id: 0000-0002-6847-5446
RISE Research Institutes of Sweden, Material och produktion, Korrosion. (Institut de la Corrosion)ORCID-id: 0000-0001-5462-2700
2020 (engelsk)Inngår i: Corrosion and Materials Degradation, E-ISSN 2624-5558, Vol. 1, nr 1, s. 187-197Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Hydrogen in combination with mechanical stress can lead to rapid degradation of high-strength steels through environmentally assisted cracking mechanisms. The scanning Kelvin probe (SKP) was applied to automotive martensitic steel grade MS1500 in order to detect local reactivity of the surface after hydrogen uptake and tensile deformation. Hydrogen and stress distribution in microstructures can be characterized by SKP indirectly measuring the potential drop in the surface oxide. Thus, the links between electron work function, oxide condition, and subsurface accumulation of hydrogen and stress have to be investigated. It was shown that plastic strain can mechanically break down the oxide film creating active (low potential) locations. Hydrogen effusion from the steel bulk, after cathodic charging in aqueous electrolyte, reduced the surface oxide and also decreased potential. It was shown that surface re-oxidation was delayed as a function of the current density and duration of cathodic hydrogen pre-charging. Thus, potential evolution during exposure in air can characterize the relative amount of subsurface hydrogen. SKP mapping of martensitic microstructure with locally developed residual stress and accumulated hydrogen displayed the lowest potential.

sted, utgiver, år, opplag, sider
2020. Vol. 1, nr 1, s. 187-197
Emneord [en]
scanning Kelvin probe, high-strength steel, hydrogen effusion, oxidation, tensile strain
HSV kategori
Identifikatorer
URN: urn:nbn:se:ri:diva-51996DOI: 10.3390/cmd1010009OAI: oai:DiVA.org:ri-51996DiVA, id: diva2:1521997
Tilgjengelig fra: 2021-01-25 Laget: 2021-01-25 Sist oppdatert: 2023-05-16bibliografisk kontrollert

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