Abstract
An a.c. electrochemical technique that meets the basic requirements for an situ localized corrosion monitor within the secondary coolant of PWR steam generators has been investigated. The technique uses two electrodes to measure the electrochemical impedance of a surface in an occluded region with high heat flux. This impedance is related to the kinetics of corrosion and marked decreases indicate the onset of a high corrosion rate. Experiments have demonstrated the ability of the technique to determine the onset of corrosion under conditions of high solution resistance and solution agitation due to local boiling. The technique operates similarly in pressurized 300°C water containing 1400 ppm Na 2SO 4.
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