2016 Volume 65 Issue 5 Pages 197-201
We investigated the effect of hydrogen absorption conditions on hydrogen desorption behavior of Ni-Ti superelastic alloy with cathodic hydrogen charging in 0.9％ NaCl solution. The amount of desorbed hydrogen at low temperature (～200 ℃) increased with increasing cathodic current density. It is likely that the increment of the amount of desorbed hydrogen at low temperature was due to the increment of the amount of hydrides formation. Vickers hardness in the vicinity of the surface of the alloy also increased with increasing cathodic current density. This is probably due to the hydrides formation in the vicinity of the surface of the alloy. These results suggest that hydrogen concentration in the vicinity of the surface of the alloy increased with increasing cathodic current density, i. e., increasing the amount of generated hydrogen per unit time, thereby causing the acceleration of hydrides formation.
