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The transient current of hydrogen removal from iron following steady‐state permeation is analyzed theoretically for two limiting conditions at the input side. For the fastest possible removal false(C=0 normalat X=0 normaland at X=Lfalse) , the amount extracted at the potentiostated side false(X=Lfalse) is one third of the total present at steady‐state permeation described by Cfalse(Xfalse)=Cnormalofalse(1−X/Lfalse) . Comparison of the integrated total flux and the amount given by the integral of Cfalse(Xfalse) indicates possible concentration dependence of hydrogen diffusivity in iron.

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