EFFECT OF VARIATIONS IN SIMULATED BWR WATER CHEMISTRY ON HIGH TEMPERATURE ELECTROCHEMSTRY OF STAINLESS STEEL

摘要

Effects of a variety of water chemistry conditions on the corrosion behavior of Type 304 stainless steel (SS) in a simulated boiling water reactor (BWR) environment are described. In particular, the effects of dissolved oxygen (O_2), hydrogen (H_2), and hydrogen peroxide (H_2O_2), and various impurities on the electrochemical corrosion potential (ECP) and oxide structure of 304 SS are considered. It has been shown that the presence of H_2 O_2, water flow rate, and corrosion rate and oxide chemistry of 304 SS significantly affected the 304 SS ECP and also observed that the presence of Cu in the water increased the 304 SS ECP in HWC, but no significant of Zn effect was observed. It is also interesting to note that in the presence of both H_2 O_2 and H_2, Pt ECP is lower than 304 SS ECP, mainly due to possible catalytic nature of Pt and/or low chemical potential of OH radicals.