Fig 10.0 The average charge of corrosion events is calculated from the low frequency values of current and potential power spectral densities .

The calculation of the frequency of corrosion events 'f' is performed for each segment by the following equation

f = ICORR / q (Equation 2.0 )

Or

f = B2 / VPSD (Equation 3.0 )

Where 'VPSD' is the low-frequency values of potential power spectral density, ICORR is the corrosion current, q is the charge and B is the Stearn-Geary coefficient. The low frequency value of the potential power spectral density is obtained averaging a number of points in the low-frequency end of the potential and current power spectral density spectra. The number of points for such average can be selected in the preference window.