Corrosion rate of pure copper has been followed by thin electrical resistance (ER) sensors in oxic bentonite/saline groundwater environment for a period of more than three years. A series of electrochemical impedance spectroscopy (EIS) measurements has been performed on the ER sensors. The EIS measurements have revealed decreasing but measurable corrosion rates all through the exposure period. The estimated corrosion rate after 3.5-year exposure from the EIS measurements falls in the range 0.4-0.7 µm/year, which is somewhat lower than the value of 1.0 µm/year obtained from the ER measurements. After exposure a set of spectroscopic and metallographic examinations were conducted in order to define the type and extent of corrosion. Also, long term plans for corrosion investigation of copper in saline and/bentonite environment in order to investigate the mechanism of corrosion process and better interpretation of impedance spectra as well as geometric effect on impedance response.
B.06 Other
COBISS.SI-ID: 1978983