Galvanodynamic Purpose
The Galvanodynamic technique generates current-vs.-voltage curves under galvanostatic control. It is not only the galvanostatic equivalent of potentiodynamic, but can also generate data analogous to Tafel and polarization data. Its data-acquisition is performed during a linear sweep of the current forced through a metal specimen. During the sweep, the potential of the specimen is recorded.
Galvanodynamic techniques can be faster than Potentiostatic techniques. For example, on a scan that includes a passive region, the Galvanodynamic scan skips quickly over the passive region. The potential region for passivity is obvious from the curve, but the passive current level is not obtainable. Depending on the information you need, the faster scan may or may not be useful.
The graphical output of the experiment is a plot of log(current) versus potential. Analysis of the curve can often yield the following types of information:
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