The Absorption of Hydrogen into Titanium under Cathodic Polarization

Abstract

The critical potential of hydrogen absorption and the hydrogen absorption rate into titanium under catholic polarization have been measured in artificial sea water with flow velocity of 2.0m/ sec and then the effect of flow velocity, dispersed sand, dissolved zinc ion and dissolved chlorine or oxygen gas on the hydrogen absorption rate of titanium have been examined. The results obtained are summarized as follows: (1) The critical potential of hydrogen absorption of tita- nium in artificial sea water lies in between -0.6 and -0.7 V (vs SCE). (2) The hydrogen absorption rate increases as the potential becomes less noble and increases sharply at potentials less noble than-1.1 V. (3) The hydrogen absorption rate decreases with increasing the flow velocity. (4) The dispersed sand, dissolved chlorine gas, or deaeration in sea water promote the hydrogen absorp- tion. (5) The passive oxide film on the titanium surface obstructs the hydrogen absorption.