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The relative efficacy of electrochemical permeation (EP) and isothermaldesorption spectroscopy (ITDS) methods for determining the hydrogen diffusivityis investigated using cold-rolled pure iron. The diffusivities determined from13 first transient and 8 second transient EP experiments, evaluated using theconventional lag and breakthrough time methods, are compared to the results of10 ITDS experiments. Results demonstrate that the average diffusivity issimilar between the second EP transient and ITDS, which are distinctlyincreased relative to the first EP transient. However, the coefficient ofvariation for the ITDS experiments is reduced by 2 and 3-fold relative to thefirst and second EP transients, confirming the improved repeatability of ITDSdiffusivity measurements. The source of the increased error in EP measurementsis systematically evaluated, revealing an important influence of assumedelectrochemical boundary conditions on the analysis and interpretation of EPexperiments.

On the relative efficacy of electropermeation and isothermal desorption approaches for measuring hydrogen diffusivity