期刊
MATERIALS
卷 12, 期 13, 页码 -出版社
MDPI
DOI: 10.3390/ma12132164
关键词
copper; Cl- medium; initial corrosion behavior; in-situ Raman characterization
类别
资金
- National Natural Science Foundation of China [51801149]
- China Postdoctoral Science Foundation [2017M620448]
- Fund of State Key Laboratory for Strength and Vibration of Mechanical Structures [SV2019-KF-10]
In order to investigate the role of chloride ion in the corrosion film formation of copper and its evolution over time, the initial corrosion behavior of copper in neutral 3.5% (wt.) NaCl solution was characterized by in-situ Raman spectroscopy along with electrochemical tests. The results demonstrated that the cuprous chloride complexes, such as CuCl and CuCl2- were produced through electrode processes, while the cuprite, Cu2O seemed to be formed via the chemical precipitation reaction instead of a direct electrochemical transformation from the metal matrix or CuCl and it occurred rather slowly. At the open circuit potential, the chlorides were generated first in the initial 2 h and then they transformed to the oxides with the CuCl2-content in the interface increasing. The in-situ Raman haracterization directly evidenced the previously reported mechanism of growth of oxide layers on copper surfaces in neutral Cl- media and clearly showed the formation of a corrosion product film and its evolution over time. The electrochemical tests corresponded to the results of in-situ Raman characterization well.
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