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Corrosion of B10 Cu-Ni Alloy in Seawater Polluted by High Concentration of NH4+ |
WANG Jiaming1, YANG Haodong1, DU Min1( ), PENG Wenshan2, CHEN Hanlin1, GUO Weimin2, LIN Cunguo2( ) |
1.Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China 2.State Key Laboratory for Marine Corrosion and Protection, Luoyang Ship Material Research Institute, Qingdao 266237, China |
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Abstract B10 Cu-Ni alloy is widely used in condenser and other facilities due to its good corrosion resistance in sea water. In practical application, it was found that the concentration of NH4+ was relatively high in sea water in the off shore port area and B10 Cu-Ni alloy was more likely to perforate. In this paper, the corrosion behavior of B10 Cu-Ni alloy in natural seawater and seawater containing 10 mg/L NH4+ was comparatively studied, in order to clarify the influence mechanism of NH4+ on the corrosion of B10 Cu-Ni alloy. The average corrosion rate, electrochemical characteristics, morphology and chemical composition of corrosion products of the steel were characterized by means of mass loss method, potentiodynamic polarization, electrochemical impedance spectroscopy (EIS), scanning electron microscope (SEM) with EDS and X-ray photoelectron spectroscopy (XPS).The results indicated that the addition of NH4+ reduced the content of protective Cu2O in the corrosion products, thus increasing the corrosion rate of B10 Cu-Ni alloy in seawater and promoting the pitting tendency.
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Received: 04 November 2020
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Fund: National Natural Science Foundation of China(U1706221) |
Corresponding Authors:
DU Min,LIN Cunguo
E-mail: ssdm99@ouc.edu.cn;lincg@sunrui.net
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About author: LIN Cunguo, E-mail: lincg@sunrui.net DU Min, E-mail: ssdm99@ouc.edu.cn
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