The repassivation kinetics study of Alloy 800 in high-temperature pressurized water

The repassivation kinetics of Alloy 800 is studied in high-temperature pressurized water with different dissolved hydrogen (DH) and dissolved oxygen (DO) at 300 degrees C. The results demonstrate that under DO conditions, the cBV value increases with the rise of DO concentration; and under DH conditions, the cBV value passes through a local maximum at DH = 1.0 ppm. In addition, the repassivadon results in the present work confirm the applicability of the slip-dissolution model for explaining stress corrosion cracking in high-temperature pressurized water by means of electrochemical measurement. Compared with other methods of evaluating stress corrosion cracking susceptibility of engineering materials, studying the repassivation kinetics by rapid scratch technique is a more economical and time-efficient evaluation method for nuclear materials in high-temperature pressurized water. (C) 2015 Published by Elsevier B.V.