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).
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