Salinity Controls on Steel Biocorrosion relevant to the Disposal of High-level Radioactive Waste

IF 5.3 2区地球科学 Q2 CHEMISTRY, PHYSICAL

Applied Clay Science Pub Date : 2025-02-04 DOI:10.1016/j.clay.2025.107723

M.N. Rose , C. Boothman , S. Shaw , K. Morris , D.L. Engelberg , M.T. Bailey , J.R. Lloyd

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引用次数: 0

Abstract

In a geological disposal facility (GDF) for spent fuel and high-level radioactive waste, the canister serves as one of the main engineered barriers. The resistance of the canister to degradation processes such as microbially influenced corrosion (MIC) needs be characterised to support GDF environmental safety cases. Here the impacts of salinity on sulfate-reducing bacterial (SRB) activity and associated MIC were explored in 84-day batch incubations at 30 °C. A 5 % standard bentonite slurry (MX80) in a low-salinity (0.1 g l⁻¹ NaCl) artificial groundwater containing lactate added as an electron donor provided suitable conditions for the proliferation of SRB. Corrosion rates of carbon steel (080-A15) coupon surfaces in microcosms amended with lactate were > 2.5 times greater than those absent of lactate, and sterile controls. At an increased salinity of 12.4 g l⁻¹, adding lactate resulted in 2 times the corrosion depth of sterile conditions, but at 50 g l⁻¹ there was no detected microbial activity, and no pronounced increase in corrosion by adding lactate compared to sterile controls. Here, microbial activity and subsequent MIC was suppressed at high salinity (50 g l⁻¹) suggesting that groundwater composition played a controlling role in SRB biocorrosion. The relevance to geodisposal scenarios, where bentonite is used to protect and support the waste canister, is discussed.

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来源期刊

Applied Clay Science 地学-矿物学

CiteScore

10.30

自引率

10.70%

发文量

289

审稿时长

39 days

期刊介绍： Applied Clay Science aims to be an international journal attracting high quality scientific papers on clays and clay minerals, including research papers, reviews, and technical notes. The journal covers typical subjects of Fundamental and Applied Clay Science such as: • Synthesis and purification • Structural, crystallographic and mineralogical properties of clays and clay minerals • Thermal properties of clays and clay minerals • Physico-chemical properties including i) surface and interface properties; ii) thermodynamic properties; iii) mechanical properties • Interaction with water, with polar and apolar molecules • Colloidal properties and rheology • Adsorption, Intercalation, Ionic exchange • Genesis and deposits of clay minerals • Geology and geochemistry of clays • Modification of clays and clay minerals properties by thermal and physical treatments • Modification by chemical treatments with organic and inorganic molecules(organoclays, pillared clays) • Modification by biological microorganisms. etc...