TY - GEN
T1 - Application of an on-line corrosion probe and a reference electrode for copper corrosion studies in repository conditions
AU - Betova, Iva
AU - Heinonen, Jussi
AU - Kinnunen, Petri
AU - Lilja, Christina
AU - Ruokola, Esko
AU - Saario, Timo
N1 - Project code: G2SU02009
PY - 2004
Y1 - 2004
N2 - Two sensors, an on-line corrosion sensor based on the wire-resistance probe design and a reference electrode which are applicable in repository conditions are introduced. Both sensors have been tested in simulated repository conditions in bentonite saturated with highly saline groundwater at 80 °C temperature and 14 MPa pressure up to 150 h exposure. In addition, it has been demonstrated that after an initial transient period of ca. 5–8 h, Cu corrosion in highly saline groundwater filled with bentonite becomes undetectably low probably because of the anoxic conditions reached in the free groundwater. At the same time, the measured corrosion potential of Cu is still in the active corrosion region. Furthermore, redox potentials in the wetted bentonite remain significantly higher than in the free groundwater. This may mean that the decomposition of oxygen contained in the pores of the bentonite is a process occurring in a time scale larger than that of the present experiments.
AB - Two sensors, an on-line corrosion sensor based on the wire-resistance probe design and a reference electrode which are applicable in repository conditions are introduced. Both sensors have been tested in simulated repository conditions in bentonite saturated with highly saline groundwater at 80 °C temperature and 14 MPa pressure up to 150 h exposure. In addition, it has been demonstrated that after an initial transient period of ca. 5–8 h, Cu corrosion in highly saline groundwater filled with bentonite becomes undetectably low probably because of the anoxic conditions reached in the free groundwater. At the same time, the measured corrosion potential of Cu is still in the active corrosion region. Furthermore, redox potentials in the wetted bentonite remain significantly higher than in the free groundwater. This may mean that the decomposition of oxygen contained in the pores of the bentonite is a process occurring in a time scale larger than that of the present experiments.
U2 - 10.1557/PROC-807-429
DO - 10.1557/PROC-807-429
M3 - Conference article in proceedings
SN - 1-55899-752-0
SN - 978-1-55899-752-3
T3 - MRS Online Proceedings
SP - 429
EP - 434
BT - Scientific Basis for Nuclear Waste Management XXVII
PB - Materials Research Society
T2 - 27th MRS Symposium on the Scientific Basis for Nuclear Waste Management
Y2 - 15 June 2003 through 19 June 2003
ER -