水溶液辐射分解产物对金属材料腐蚀的影响

实验研究了水辐射分解作用对高放废物深地质处置容器材料的影响。在高放废物深地质处置库附近的地下水,受辐射线作用后分解出氧、氢和氧化产物(例如H_2O_2等),于是在高放废物容器周围形成一个氧化场,导致高放废物中的某些重要放射性核素(例如U,Np和Tc)易溶于水,并向远域迁移。本实验中的含FeSO_4(0.13 mol/L)水溶液在吸收剂量为0、20、60、180、500kGy的射线作用下,其氧化还原电位(Eh)值由+357mV增至+414 mV;在不同吸收剂量的射线作用下,金属Cu、金属Al、0.357 mv金属Fe和不锈钢(后者是我国拟采用的高放废物包装容器材料),在水溶液中的氧化侵蚀强度,分别比在无辐射情况下的大0.2-6.1倍。

THE EFFECT OF RADIOLYSIS PRODUCT OF WATER ON CORROSION OF METAL MATERIAL

In this paper the effect of radiolysis product on high-levelradioactive waste (HLW) container is experimentally studied. Groundwater near deeprepository is splitted into hydrogen, oxygen and oxidizing compounds (e. g., H_2O_2)under the influence of ionizing radiation, called radiolysis. It is of particularconcern because itproduces all oxidation environment and an outward-migration redoxfront around each HLW canister, within which several important radionuclides(e. g., U, Np and Tc) are much more soluble and are migrated far away. The Fhlue of watevar solutionwith FeSO_4 (0.13 mol/L) in present experiment added under theinfluence of radioationof 0, 20, 60, 180 and 500 kGy(from 357 mV to 414 mV).Oxidation corrosion of copper, aluminium, iron and stainless stell metal containedin water under radiation is 0.2-6.1 times stronger than that under no radiation.