Unveiling the synergistic effect of thermal aging and irradiation corrosion on the passivation performance and stress corrosion cracking of 308L stainless steel under high-temperature water environment
作者
单位
a. Corrosion and Protection Center、Northeastern University、Shenyang、110819、P. R. China. b. Material Engineering Technology Center、Suzhou Nuclear Power Research Institute、Suzhou 215004、China. c. National Engineering Research Center for Nuclear Power Plant Safety & Reliability、Suzhou 215004、China.
收录来源
International Corrosion Congress · 第22届国际腐蚀大会
摘要
This study investigated coupling of thermal aging with irradiation corrosion, and carried out the microstructure and electrochemical characterization of 308L stainless steel (SS). The passivation performance of 308L SS was studied under the simulated pressurized water reacto r (PWR) environmental condition and its stress corrosion cracking (SCC) performance was tested under thermal aging -irradiation conditions. The experimental results indicate that thermal aging results in spinodal decomposition of δ -ferrite, giving rise to G -phase precipitate and carbide precipitate formation at δ/γ -phase interface, whereas irradiation causes Cr depletion and Ni enrichment at the interface. Both thermal aging and irradiation lead to the decreased corrosion resistance of 308L SS. Under coupling conditions of the two, severe Cr loss occurs at the phase boundary, which leads to severe corrosion on δ/γ phase boundary and also reduces SCC resistance of 308L SS.