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| INITIAL CORROSION BEHAVIOR OF COPPER AND BRASS IN TROPICAL MARITIME ATMOSPHERIC ENVIRONMENT |
| WU Jun1,2, LI Xiaogang2, DONG Chaofang2, ZHANG Sanping1, ZHOU Jianlong2
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1. Wuhan Research Institute of Materials Protection，Wuhan 430030
2. Corrosion and Protection Center,University of Science and Technology Beijing, Beijing 100083 |
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Abstract The corrosion behavior and regularity of copper T2 and brass H62 exposed in tropical maritime atmospheric environment in Xisha Islands for 1 month, 3 mouths and 6 months were studied through field exposure test. The surface and cross-sections morphologies of corrosion products were observed using SEM, energy dispersive spectromet (EDS) and X-ray diffraction (XRD) analysis were used to obtain the detailed information of the corrosion products. Electrochemical impedance spectroscopy (EIS)measurements were made for copper T2 and brass H62 specimens. The results showed that obvious localized corrosion occurred for copper T2 and brass H62 specimens in maritime atmospheric environment in Xisha Islands. The existence of O and Cl- is the main reason for the initial corrosion. The relatively high relativity humidity, temperature, Cl- amount, long sunshine, and the existence of dust accelerated the corrosionm of copper T2 and brass H62 specimens. The main corrosion product for copper T2 is Cu2O and for brass H62 are Cu3Cl4(OH)2 and Zn5(OH)8Cl2•H2O.
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Received: 28 September 2010
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