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Stress corrosion of copper in sulfide solutions: Variations in pH-buffer, strain rate, and temperature
RISE Research Institutes of Sweden, Materials and Production, Corrosion.ORCID iD: 0000-0002-1577-6704
RISE Research Institutes of Sweden, Materials and Production, Corrosion.ORCID iD: 0000-0001-6256-7123
Swedish Nuclear Fuel and Waste Management Co, Sweden.
2023 (English)In: Materials and corrosion - Werkstoffe und Korrosion, ISSN 0947-5117, E-ISSN 1521-4176Article in journal (Refereed) Epub ahead of print
Abstract [en]

Copper is the intended canister material for the disposal of spent nuclear fuel in Sweden. At repository depth the groundwater may contain dissolved sulfide. The main goal for this work is to study the tendency for stress corrosion of copper in sulfide solutions and examine the influence of various experimental parameters on stress corrosion. Slow strain rate testing was performed on copper test rods in solutions with 1.0 mM sulfide. The pH was kept near neutral with phosphate or borate buffer. The test matrix included variations in temperature, strain rate, and duration of the tests as well as salt and buffer concentrations. Cross-sections of the specimens after testing were investigated using scanning electron microscope/energy dispersive X-ray spectroscopy detector. Stress–strain curves do not reveal any signs of stress corrosion. However, intergranular corrosion in the shape of crack and pit-like features developed in all tests with 1.0 mM sulfide. The length of the deepest features in all these tests was of the same order of magnitude (10–20 µm). The suggested mechanism proposes that crack-like features originate at the surface of the copper metal from the oxidation of grain boundaries that behave as slightly less noble. © 2023 The Authors. 

Place, publisher, year, edition, pages
John Wiley and Sons Inc , 2023.
Keywords [en]
copper, corrosion, inter granular, SSRT, stress, sulfide, Copper compounds, Copper corrosion, Grain boundaries, Groundwater, Intergranular corrosion, Residual stresses, Scanning electron microscopy, Stress corrosion cracking, Sulfur compounds, Textures, X ray detectors, X ray spectroscopy, Canister materials, Dissolved sulfide, pH buffers, Spent nuclear fuels, Strain-rates, Strain-temperature, Stress-corrosion, Sulphide, Strain rate
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:ri:diva-64343DOI: 10.1002/maco.202313759Scopus ID: 2-s2.0-85150981810OAI: oai:DiVA.org:ri-64343DiVA, id: diva2:1752304
Note

This work was commissioned by SKB, Swedish NuclearFuel and Waste Management Co.

Available from: 2023-04-21 Created: 2023-04-21 Last updated: 2023-12-04Bibliographically approved

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Taxén, ClaesMoya Nunez, Alice

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