An approach to the effect of hydrogen loading on the anodic behaviour of Ti in NaOH solutions

The voltammetric behaviour of titanium electrode in 0.5 M NaOH solution was investigated. The I-E curves revealed the presence of a well-defined O-2 e volution peak. The peak current density decreases to a great extent by pre- loading the metal with hydrogen by cathodic polarization, indicating that p re-loading the metal with hydrogen suppresses the O-2 evolution. The oxidat ion of hydrogen loaded inside the metal was suggested to be responsible for reducing the O-2 evolution peak current density during Ti anodization. The charge consumed during the anodic polarization of Ti, below O-2 evoluti on potential, was used to estimate the anodization coefficient and capacita nce measurement was conducted for measuring the dielectric constant of the oxide film. Pre-loading the metal with hydrogen was found to decrease the o xide firm formation rate as well as the dielectric constant.