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Hydrogen detection in metals is a research field of growing importance, especially in the last decades since hydrogen is increasingly used as energy carrier and hydrogen-embrittlement related failures have emerged as serious problem for the steel industry. Numerous techniques have been developed in order to study hydrogen diffusion in metals and enabling determination of the hydrogen diffusion coefficient, amount of diffusible hydrogen as well as trapping effects. Thermal desorption spectroscopy1–4) and electrochemical methods1,5–8) constitute a large part of these techniques. However, the number of techniques capable of visualizing diffusible hydrogen and its distribution in a metal sample is very limited. Important examples are hydrogen microprint technique,9–13) silver decoration14,15) and secondary ion mass spectrometry.16–19) A relatively new method of visualizing hydrogen in steel is the spatially resolved detection via scanning Kelvin probe (SKP), which was already successfully applied for determination of hydrogen in palladium,20–22) iron23) and steel,20,22,24,25) as hydrogen causes a change in work function, detected by SKP. Advantages of this technique are arising from the very sensitive, non-destructive measurement principle, the possibility to investigate surface processes as well as the possibility to link the measured work function or rather contact potential difference (CPD) with an electrochemical potential.26) In this manner, influence of microstructural defects in steel, Rolling Direction Dependent Diffusion Coefficients of Hydrogen in Ferritic Steel by SDCM Charging and SKP Probing