Copper corrosion in bentonite/saline groundwater solution: Effects of solution and bentonite chemistry. (January 2015)

• Record Type: Journal Article
• Authors: Kosec, T.; Qin, Z.; Chen, J.; Legat, A.; Shoesmith, D.W.
• Is Part Of: Corrosion science. Volume 90(2015)
• Page Start: 248
• Page End: 258
• Publication Date: 2015-01
• Subjects: A. Copper -- B. EIS -- B. Raman spectroscopy; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2014.10.017
• Languages: English
• ISSNs: 0010-938X

Abstract

Highlights: Copper corrosion was studied in simulated groundwater with and without bentonite. Different electrochemical and spectroscopic techniques were used. In solution, small amounts of sulphide control the early corrosion behaviour. In solution, Cu2 S is rapidly converted to non protective Cu2 O. In presence of bentonite, corrosion proceeds slowly under O2 transport control. Abstract: Copper corrosion has been studied in simulated groundwater with and without added bentonite clay using different electrochemical techniques. The corroded surfaces were characterised by SEM/EDS, Raman spectroscopy and Auger depth profiling. In both environments small amounts of sulphide (0.005 mM) control the early corrosion behaviour. Under aerated conditions an initially formed Cu2 S film is rapidly converted to a non-protective layer of cuprite and corrosion proceeds with the deposition of an outer layer of atacamite. In the presence of bentonite corrosion proceeds slowly under O2 transport control. No atacamite is observed and the Cu surface appears slightly pitted.