Abstract
The hydrogen trapping effects in Fe-Ti alloys were studied by repetitive electrochemical permeation measurements and gas pressure oscillating permeation measurements. A theoretical analysis has been made of the effects of both reversible and irreversible trapping sites on hydrogen diffusion using the Crank-Nicolson finite difference method. The break-through times are different for the first and second electrochemical polarizations in Fe-Ti alloys. The difference of the break-through times for the first and second polarizations is due to the irreversible trapping sites in the alloys, and the difference of break-through times in the second polarization for the alloys and pure iron is due to the reversible trapping sites
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