Effect of Sulfide Concentration on Copper Corrosion in Anoxic Chloride-Containing Solutions
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The structure and property of passive film on copper are strongly dependent on the sulfide concentration; based on this, a series of electrochemical methods were applied to investigate the effect of sulfide concentration on copper corrosion in anaerobic chloride-containing solutions. The cyclic voltammetry and x-ray photoelectron spectroscopy analysis demonstrated that the corrosion products formed on copper in anaerobic sulfide solutions comprise Cu2S and CuS. And the corrosion resistance of copper decreased with increasing sulfide concentration and faster sulfide addition, owing to the various structures of the passive films observed by the atomic force microscope and scanning electron microscope. A p-type semiconductor character was obtained under all experimental conditions, and the defect concentration, which had a magnitude of 1022–1023 cm−3, increased with increasing sulfide concentration, resulting in a higher rate of both film growth and dissolution.
Keywordscopper electrochemical impedance spectroscopy passive film sulfide
The authors would like to gratefully acknowledge the financial support from the National Natural Science Foundation of China (No. 51222106) and the Fundamental Research Funds for the Central Universities (No. FRF-TP-14-011C1) and National Basic Research Program of China (973 Program) (No. 2014CB643300).
- 3.K. Birch, M.B. Belfadhel, J. Freire-Canosa et al., Technical Research and Development Program for Long-term Management of Canada’s Used Nuclear Fuel—Annual Report 2007. Canosa, 2007Google Scholar
- 5.Hedin A, Kautsky U, Morén L et al., SR 97: Post-Closure Safety for a KBS 3 Deep Repository For Spent Nuclear Fuel—Overview. Mrs Online Proceeding Library, 1999, 663Google Scholar
- 6.K. Pedersen, ChemInform Abstract: Microbial Processes in Radioactive Waste Disposal, Cheminform, 2001, 32(7), p 3–97Google Scholar
- 7.SKB Swedish Nuclear Fuel and Waste Management Co., Long-term Safety for KBS-3 Repositories at Forsmark and Laxemar—A First Evaluation, Main Report of the SR-Can Project, SKB Technical Report, TR-06-09, 2006.Google Scholar
- 10.D.D. Macdonald. Erratum: Theory of Steady-State Passive Films. J. Electrochem. Soc., 1992, 139(7)Google Scholar
- 20.V. Krylova and M. AndrulevicˇIus, Optical, XPS and XRD Studies of Semiconducting Copper Sulphide Layers on a Polyamide Film, Int. J. Photoenergy, 2009, 279(1), p 53–58Google Scholar
- 23.B.Y. Chang and S.M. Park, Electrochemical Impedance Spectroscopy, Annu. Rev. Anal. Chem., 2014, 55(1–2), p 349–365Google Scholar