Abstract
The influence of the hydrogen charging on the pitting corrosion in duplex stainless steel was investigated by the scanning Kelvin probe PROBE force microscopy. The Volta potential maps of the hydrogen charged sample revealed that some low potential areas emerged at the ferrite/austenite boundaries or inside the ferrite phases, which may be considered as preferential nucleation sites of pitting corrosion induced by hydrogen. Moreover, a continuous evolution of Volta potential images indicated that the effects of hydrogen on ferrite and austenite were different due to different hydrogen behavior in two phases, which was confirmed by the work function of ferrite and austenite.
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