The hydrides which were formed during cathodic polarization in acid solutions were studied by using the 15N nuclear reaction method. The diffusivity in the hydrides was described by

D (cm2/s) = 1.33 x 10-4 exp[-0.36(eV)/kT]

with a value of 8.68 x 10-11cm2/s at 22C. The H diffusivity in Ti single crystals depended upon the crystal orientation.

E.Brauer, R.Gruner, F.Rauch: Berichte der Bunsengesellschaft für Physikalische Chemie, 1983, 87[4], 341-5