The formation and aggravation of hydrogen damage in Fe-3 wt-％ Si alloy during cathodiccharging Were studied by means of Lange transmission X-ray topography.Results showedthat hydrogen damage did not form in the specimens charged in 0.5 mol/L H2S04 so-lution without poison,and occurred with addition of 250 mg/L As2O3 even at very lowcharge current density.As charging at a certain current density,the size of the damagemay enlarge up to a limit yet no more by prolonged time.The damage size increasedwith increase of charging current density,but not so apparent at high current density.An external tensile stress could promote the formation of hydrogen damage obviously.It seems that for charging in H2SO4 solution containing poison,the drop of hydrogenpermeation curve against time prolongation is due to the formation of hydrogen damages.
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