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- W2007160906 abstract "Electrochemical permeation experiments on fully-annealed-commercially-pure iron samples with two group samples, group I samples with plasma cleaning and pre-sputtering and group II samples without it, were conducted at a temperature range of 25–80°C. The diffusion coefficient, desorption rate and absorption parameter were determined from fitting the permeation fluxes with the new model proposed in Part I of this series. Being independent of surface treatment, the diffusion coefficient of hydrogen is given as follows: D=D0 exp(−Q/RT), D0=7.93×10−4 cm2/s, Q=7340 J/mol. If the diffusion activation energy was evaluated by the time-lag model, the diffusion activation energy for group II samples is 22 970 J/mol, three times higher than the value from the present model. The results also show that the energy barrier for desorption is lower in group I samples compared with that in group II samples. The activation energy of desorption for each of the two group samples is higher than the activation energy of diffusion. As a direct result, the ratio of drift velocities increases with increasing temperature and makes the time-lag method appropriate at elevated temperatures." @default.
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- W2007160906 date "1998-09-01" @default.
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- W2007160906 title "Effects of absorption and desorption on hydrogen permeation—II. Experimental measurements of activation energies" @default.
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- W2007160906 doi "https://doi.org/10.1016/s1359-6454(98)00177-3" @default.
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