Surface oxide reduction by hydrogen permeation through iron foil detected using a scanning Kelvin probe

2013 ◽  
Vol 27 ◽  
pp. 144-147 ◽  
Author(s):  
G. Williams ◽  
H.N. McMurray ◽  
R.C. Newman
Keyword(s):  
Hydrogen Permeation ◽  
Surface Oxide ◽  
Iron Foil ◽  
Oxide Reduction ◽  
Kelvin Probe ◽  
Scanning Kelvin Probe

scholarly journals Scanning Kelvin Probe Investigation of High-Strength Steel Surface after Impact of Hydrogen and Tensile Strain

2020 ◽  
Vol 1 (1) ◽  
pp. 187-197 ◽  
Author(s):  
Andrei Nazarov ◽  
Flavien Vucko ◽  
Dominique Thierry
Keyword(s):  
Tensile Deformation ◽  
Electron Work Function ◽  
High Strength Steels ◽  
High Strength ◽  
Potential Drop ◽  
Hydrogen Uptake ◽  
Surface Oxide ◽  
Kelvin Probe ◽  
Scanning Kelvin Probe ◽  
Cracking Mechanisms

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.

In Situ Structure-Sensitive Studies of Metal-Hydrogen Interactions by Scanning Kelvin Probe

2015 ◽  
Vol 228 ◽  
pp. 344-352
Author(s):  
Bożena Łosiewicz
Keyword(s):  
Hydrogen Permeation ◽  
Research Area ◽  
Scanning Probe ◽  
Complex Phenomenon ◽  
Recent Application ◽  
Kelvin Probe ◽  
Scanning Kelvin Probe ◽  
Structure Sensitive ◽  
The Family

Effect of hydrogen on metals is a complex phenomenon. The objective of this paper was to outline the recent application of scanning Kelvin probe (SKP) for a deeper understanding of nature and properties of metal-hydride system. SKP belongs to the family of scanning probe electrochemistry techniques (SPETs) that are currently used and developed. Different applications of SKP technique for hydrogen detection in metals, hydrogen permeation through metals with high local resolution, and quantitative analysis of hydrogen in materials, were presented. The emphasis in this work was on presenting specific applications of SKP rather than extensive reviews; details of how and why this technique is useful in research area was given.

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