Abstract
The electrochemical behavior of commercially pure titanium was investigated as a function of NaOH concentration by open- circuit potential (OCP) transients, cyclic voltammograms and galvanostatic method. The OCP value was observed to decrease with increasing NaOH concentration, and the magnitude of the anodic current peaks in cyclic voltammograms becomes higher with increasing NaOH concentration. These results indicate easier anodic dissolution of Ti in more concentrated alkaline solutions in active potential region. The cyclic voltammograms and galvanostatic potential transient curves of Ti showed that protective anodic oxide films are formed on Ti in the passive potential region in all the concentrations of NaOH up to 10 M. The surface film formed anodically on Ti becomes less protective with increasing NaOH concentration up to 3M but it becomes more protective with increasing NaOH concentration above 3M NaOH.
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