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Corrosion Behavior of Cu40Zn in Sulfide-Polluted 3.5% NaCl Solution

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Abstract

The corrosion behavior of a duplex-phase brass Cu40Zn in clean and sulfide-polluted 3.5% NaCl solutions was investigated by conducting electrochemical and gravimetric measurements. The corrosion product films were analyzed by scanning electron microscopy, energy-dispersive spectroscopy and x-ray diffraction. The presence of sulfide shifted the corrosion potential of Cu40Zn toward a more negative value by 100 mV and increased the mass loss rate by a factor of 1.257 compared with the result in the clean solution. The corrosion product film in the clean solution was thin and compact; it mainly consisted of oxides, such as ZnO and Cu2O. By contrast, the film in the sulfide-polluted solution was thick and porous. It mainly contained sulfides and zinc hydroxide chloride (i.e., Zn5(OH)8Cl2·H2O). The presence of sulfide ions accelerated the corrosion damage of Cu40Zn by hindering the formation of protective oxides and promoting the formation of a defective film which consisted of sulfides and hydroxide chlorides.

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Acknowledgments

This research was financially supported by National Natural Science Foundation of China (No. 51601058) and Fundamental Research Funds for the Central Universities of P.R. China (Nos. 2015B30314 and 2014B11614).

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Authors and Affiliations

  1. College of Mechanical and Electrical Engineering, Hohai University, 200 Jinling North Road, Changzhou, 213022, China

    Q. N. Song, N. Xu, Y. F. Bao, Y. F. Jiang, W. Gu & Z. Yang

  2. Key Laboratory of Nuclear Materials and Safety Assessment, Institute of Metal Research, Chinese Academy of Sciences, 62 Wencui Road, Shenyang, 110016, China

    Y. G. Zheng

  3. College of Materials Science and Engineering, Jiangsu University of Science and Technology, 2 Mengxi Road, Zhenjiang, 212003, China

    Y. X. Qiao

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  1. Q. N. Song
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Correspondence to Y. F. Bao.

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Song, Q.N., Xu, N., Bao, Y.F. et al. Corrosion Behavior of Cu40Zn in Sulfide-Polluted 3.5% NaCl Solution. J. of Materi Eng and Perform 26, 4822–4830 (2017). https://doi.org/10.1007/s11665-017-2940-z

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  • DOI: https://doi.org/10.1007/s11665-017-2940-z

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