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EFFECTS OF SO42- ON THE CORROSION BEHAVIOR OF NiCu LOW ALLOY STEEL IN DEAERATED BICARBONATE SOLUTIONS
Lu Yunfei1,2; Dong Junhua1; Ke Wei1
Corresponding AuthorDong Junhua(jhdong@imr.ac.cn)
2015-09-11
Source PublicationACTA METALLURGICA SINICA
ISSN0412-1961
Volume51Issue:9Pages:1067-1076
AbstractHigh level radioactive waste (HLW) is an extremely dangerous by-product of the global nuclear industry. Due to its intensely radioactive nature and ultra long half-life, HLW has to be safely managed and disposed for thousands of years, isolated from the biosphere. Deep geological repository (DGR) is considered to be the most feasible option worldwide because of its operability, stability, durability, environmental protection and so on. Basically, DGR relies on a multibarrier system and it consists of metallic canisters, backfill materials and a stable geologic formation. Since radionuclides could be moved into the biosphere by action of groundwater, both the geologic formation and backfill materials have to be of very low hydraulic permeability and metal canisters have to be corrosion resistant and prevent contact between the groundwater and the radioactive waste for as long as possible. Low carbon steel has been selected and studied as a candidate canister material in many countries because its long industrial experience, high-strength, low cost and it is less prone to localized corrosion than materials that passivity, but its larger corrosion rate may also set an insuperable barrier for the practical application. Recently, our studies revealed that NiCu low alloy steel is a more promising candidate for the canister material compared with the popular one, low carbon steel, since the former performs a more acceptable corrosion rate without increasing much cost and has better resistance to localized corrosion in environments with high concentration of Cl-. In this work, effects of SO42-, another ubiquitous species in deep groundwater, on the corrosion behavior of NiCu low alloy steel during immersion in simulated deep groundwater environments were investigated by in situ electrochemical measurements and surface analysis techniques. Results show that the addition of SO42- can promote the substrate dissolution during the initial stage of immersion. In the later stage, SO42- weakens the protectiveness of formed films and consequently, active dissolution prevails on the electrode surface rather than the prepassivation. Concentrated SO42- and HCO3- can both promote the formation of Fe-6(OH)(12)CO3. The main components of corrosion products are alpha-FeOOH, Fe3O4 and Fe-6(OH)(12)CO3, and uniform corrosion is observed.
Keywordlow alloy steel rust HCO3- SO42-
Indexed BySCI
Language英语
WOS Research AreaMetallurgy & Metallurgical Engineering
WOS SubjectMetallurgy & Metallurgical Engineering
WOS IDWOS:000362617700005
PublisherSCIENCE PRESS
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/120946
Collection中国科学院金属研究所
Corresponding AuthorDong Junhua
Affiliation1.Chinese Acad Sci, Inst Met Res, Environm Corros Ctr, Shenyang 110016, Peoples R China
2.Wuhan Second Ship Design & Res Inst, Wuhan 430064, Peoples R China
Recommended Citation
GB/T 7714
Lu Yunfei,Dong Junhua,Ke Wei. EFFECTS OF SO42- ON THE CORROSION BEHAVIOR OF NiCu LOW ALLOY STEEL IN DEAERATED BICARBONATE SOLUTIONS[J]. ACTA METALLURGICA SINICA,2015,51(9):1067-1076.
APA Lu Yunfei,Dong Junhua,&Ke Wei.(2015).EFFECTS OF SO42- ON THE CORROSION BEHAVIOR OF NiCu LOW ALLOY STEEL IN DEAERATED BICARBONATE SOLUTIONS.ACTA METALLURGICA SINICA,51(9),1067-1076.
MLA Lu Yunfei,et al."EFFECTS OF SO42- ON THE CORROSION BEHAVIOR OF NiCu LOW ALLOY STEEL IN DEAERATED BICARBONATE SOLUTIONS".ACTA METALLURGICA SINICA 51.9(2015):1067-1076.
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