EIS pitting temperature determination of A182 nickel based alloy in simulated BWR environment containing dilute seawater

• Stable pitting events in function of the temperature are monitored by electrochemical impedance spectroscopy.
• The pitting temperature for the nickel based alloy A182 in solution containing 450 ppm Cl− is defined as above 160 °C.
• The presented method can be applied for others passive alloys as stainless steel in solution containing aggressive anions.

A method based on electrochemical impedance spectroscopy (EIS) measurements to monitor the pitting temperature of passive alloys in a given media is developed in this communication. The pitting corrosion behavior of the nickel based alloy 182 in water containing 450 ppm by weight of chloride is presented in this study. The analysis of the EIS fit parameters from the proposed equivalent electrical circuit allows to determine the temperature from which stable pitting event occurs at open circuit potential. For the A182 sample this temperature is measured above 160 °C.

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