Titanium potential-time curves

Figure 9.8 Potential-time curves for pure titanium in 0.9% saline with and without additions of oxytetracycline 0(upper line), as received 0](lower line), abraded 00.01 mg ml 0.1 mg ml A 1.0 mgmH. (von Fraunhofer etaL, 1989.)...

The direct electrochemical measurement of such low corrosion rates is difficult and limited in accuracy. However, electrochemical techniques can be used to establish a database against which to validate rates determined by more conventional methods (such as weight change measurements) applied after long exposure times. Blackwood et al. (29) used a combination of anodic polarization scans and open circuit potential measurements to determine the dissolution rates of passive films on titanium in acidic and alkaline solutions. An oxide film was first grown by applying an anodic potential scan to a preset anodic limit (generally 3.0 V), Fig. 24, curve 1. Subsequently, the electrode was switched to open-circuit and a portion of the oxide allowed to chemically dissolve. Then a second anodic... 

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