Cumulative localized corrosion rate and cumulative maximum localized corrosion rate factors
are introduced for corrosion monitoring using coupled multielectrode array sensor probes. Maximum
localized corrosion rate is the corrosion rate on any of the electrodes of a probe that has the highest
corrosion rate at a given moment of time. Cumulative maximum localized corrosion rate is the corrosion
rate of the electrode that has been corroded the most in a given time period. The cumulative maximum
localized corrosion rate is directly related to the corrosion damage (maximum localized corrosion
depth); the maximum localized corrosion depth equals the integration of the cumulative maximum
localized corrosion rate. Maximum localized corrosion rate should be used for process control purposes,
but cumulative maximum localized corrosion rate should be used to evaluate the localized corrosion
effect on metal damage.