Study of hydrogen entry into high strength steels as a consequence of atmospheric corrosion is ofgreat interest in recent years. Different factors as rust layer composition or changing environmentalconditions may affect hydrogen absorption. There are several techniques for in-situ hydrogendetection allowing for studying the effect of changing climatic parameters. Scanning Kelvin Probe(SKP) technique is one of them. Hydrogen detection with SKP is based on measurement of Voltapotential changes due to reduction of oxide layer components by diffusing hydrogen.In this work, SKP was used to study the effect of humidity cycling on hydrogen uptake in highstrength steels. One side of a steel specimen was contaminated with corrosion activator andexposed in model atmospheric conditions under humidity cycling, while the Volta potential of theopposite side was monitored by SKP. The data were linked to real-time corrosion ratemeasurements. In order to study the effect of the corrosion products (rust) composition onhydrogen entry, SKP measurements on samples pre-corroded under different conditions wereperformed in combination with humidity cycling. Corrosion products composition was analysed.
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