Use the Tafel technique to obtain an accurate estimate of the corrosion rate and beta constants of a metal in a solution. Cell current is measured during a slow sweep of the potential. The sweep typically is from –250 to +250 mV relative to *E*_{oc}. A fit of the data to a standard model (Butler-Volmer Model) yields an estimate of *I*_{corr} which is used to calculate a corrosion rate.
The graphical output of the experiment is a plot of log(current) versus potential. Analysis of the curve can yield the following types of information: