Abstract
The electrochemical permeation technique was used to determine diffusivity and solubility of hydrogen in annealed Armco iron. Analysis of permeation build-up transients showed that hydrogen diffusivity increased with increase in charging current density. From analyses of build-up and decay transients, the hydrogen concentration within the metal was found to increase with increase in charging current density. Diffusivity and concentration data from these analyses were fitted by the method of least squares to the linear equation D 22° C = 4.05 × 10 −5 + 46.87 c ave cm 2 sec −1 where C ave is the average hydrogen concentration in the metal in units of mole H/cc of Fe. Numerical methods were used to solve the problem of one-dimensional diffusion in a plane sheet for the case where D is dependent on concentration by the above relationship. Results from this calculation were found to be in fair agreement with the hydrogen permeation results. Based on these findings, it is proposed that hydrogen diffusivity in Armco iron increases with concentration.
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