Effect of sulphide exposure on mechanical properties of CuOFP

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Abstract

In Finland and Sweden nuclear waste disposal is planned to be executed according to the KBS-3-concept. In the concept copper canisters containing the used nuclear fuel are buried in 400-500 m deep in the bedrock. Eventually the surface of the copper canister will come in contact with bentonite pore water which contains corrosive species such as sulphide. In this paper the effect of exposure to sulphide containing bentonite pore water at room temperature on the mechanical properties of oxygen free phosphorous doped copper (CuOFP) was studied with standard ex situ tensile and creep tests. Stress corrosion cracking (SCC) susceptibility of CuOFP was studied with in situ slow strain rate testing (SSRT). Tensile tests performed at room temperature showed a slight trend of degradation in mechanical properties with increasing sulphide concentration. Creep tests were accelerated by performing them at an elevated temperature of T 5-15°C, but still within the power law creep regime. In creep tests the same kind of trend as in the tensile tests could be observed but when the results were compared to the publicly available CuOFP creep data the variations between the exposed and reference samples lay within the data scatter.
Original languageEnglish
Pages (from-to)410-414
JournalCorrosion Engineering Science and Technology
Volume49
Issue number6
DOIs
Publication statusPublished - 2014
MoE publication typeA1 Journal article-refereed

Fingerprint

Sulfides
Creep
Mechanical properties
Bentonite
Copper
Radioactive Waste
Caustics
Water
Nuclear fuels
Stress corrosion cracking
Radioactive wastes
Waste disposal
Temperature
Strain rate
Oxygen
Degradation
Testing

Keywords

  • nuclear waste canisters
  • repositories
  • sulphide
  • oxygen free phosphorus doped copper
  • mechanical properties

Cite this

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title = "Effect of sulphide exposure on mechanical properties of CuOFP",
abstract = "In Finland and Sweden nuclear waste disposal is planned to be executed according to the KBS-3-concept. In the concept copper canisters containing the used nuclear fuel are buried in 400-500 m deep in the bedrock. Eventually the surface of the copper canister will come in contact with bentonite pore water which contains corrosive species such as sulphide. In this paper the effect of exposure to sulphide containing bentonite pore water at room temperature on the mechanical properties of oxygen free phosphorous doped copper (CuOFP) was studied with standard ex situ tensile and creep tests. Stress corrosion cracking (SCC) susceptibility of CuOFP was studied with in situ slow strain rate testing (SSRT). Tensile tests performed at room temperature showed a slight trend of degradation in mechanical properties with increasing sulphide concentration. Creep tests were accelerated by performing them at an elevated temperature of T 5-15°C, but still within the power law creep regime. In creep tests the same kind of trend as in the tensile tests could be observed but when the results were compared to the publicly available CuOFP creep data the variations between the exposed and reference samples lay within the data scatter.",
keywords = "nuclear waste canisters, repositories, sulphide, oxygen free phosphorus doped copper, mechanical properties",
author = "Konsta Sipil{\"a} and Esko Arilahti and Taru Lehtikuusi and Timo Saario",
year = "2014",
doi = "10.1179/1743278214Y.0000000180",
language = "English",
volume = "49",
pages = "410--414",
journal = "Corrosion Engineering Science and Technology",
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TY - JOUR

T1 - Effect of sulphide exposure on mechanical properties of CuOFP

AU - Sipilä, Konsta

AU - Arilahti, Esko

AU - Lehtikuusi, Taru

AU - Saario, Timo

PY - 2014

Y1 - 2014

N2 - In Finland and Sweden nuclear waste disposal is planned to be executed according to the KBS-3-concept. In the concept copper canisters containing the used nuclear fuel are buried in 400-500 m deep in the bedrock. Eventually the surface of the copper canister will come in contact with bentonite pore water which contains corrosive species such as sulphide. In this paper the effect of exposure to sulphide containing bentonite pore water at room temperature on the mechanical properties of oxygen free phosphorous doped copper (CuOFP) was studied with standard ex situ tensile and creep tests. Stress corrosion cracking (SCC) susceptibility of CuOFP was studied with in situ slow strain rate testing (SSRT). Tensile tests performed at room temperature showed a slight trend of degradation in mechanical properties with increasing sulphide concentration. Creep tests were accelerated by performing them at an elevated temperature of T 5-15°C, but still within the power law creep regime. In creep tests the same kind of trend as in the tensile tests could be observed but when the results were compared to the publicly available CuOFP creep data the variations between the exposed and reference samples lay within the data scatter.

AB - In Finland and Sweden nuclear waste disposal is planned to be executed according to the KBS-3-concept. In the concept copper canisters containing the used nuclear fuel are buried in 400-500 m deep in the bedrock. Eventually the surface of the copper canister will come in contact with bentonite pore water which contains corrosive species such as sulphide. In this paper the effect of exposure to sulphide containing bentonite pore water at room temperature on the mechanical properties of oxygen free phosphorous doped copper (CuOFP) was studied with standard ex situ tensile and creep tests. Stress corrosion cracking (SCC) susceptibility of CuOFP was studied with in situ slow strain rate testing (SSRT). Tensile tests performed at room temperature showed a slight trend of degradation in mechanical properties with increasing sulphide concentration. Creep tests were accelerated by performing them at an elevated temperature of T 5-15°C, but still within the power law creep regime. In creep tests the same kind of trend as in the tensile tests could be observed but when the results were compared to the publicly available CuOFP creep data the variations between the exposed and reference samples lay within the data scatter.

KW - nuclear waste canisters

KW - repositories

KW - sulphide

KW - oxygen free phosphorus doped copper

KW - mechanical properties

U2 - 10.1179/1743278214Y.0000000180

DO - 10.1179/1743278214Y.0000000180

M3 - Article

VL - 49

SP - 410

EP - 414

JO - Corrosion Engineering Science and Technology

JF - Corrosion Engineering Science and Technology

SN - 1478-422X

IS - 6

ER -