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| Research of Corrosion Behavior of Thermal Spraying Zn-Ni Composite Coating in Seawater |
| WANG Yingfa1, 2, HUANG Guosheng2, CHENG Xudong1, LI Xiangbo2, XING Lukuo2, GUO Juan2, 3, MA Yan4 |
1. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China;
2. Science and Technology on Marine Corrosion and Protection Laboratory, Luoyang Ship Material Research Institute(LSRMI), Qingdao 266101, China;
3. School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, China;
4. Sunrui Marine Environment Engineering Co., Ltd, Qingdao 266101, China; |
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Abstract In order to improve the corrosion resistance of coating and prolong its life in the marine environment. Zn-Ni composite coatings including different nickel content were prepared by oxyacetylene flame spraying process, with Zn-Ni composite powders which were prepared by spray-dried process. The protection performance and corrosion mechanism of the Zn-Ni composite coatings in seawater were tested by means of potentiodynamic polarization and electrochemical impedance, and with the analysis of SEM, EDS and XRD. Results shown that the stable corrosive potential of the coatings finally ranges from -0.98 V to -0.95 V. The presence of nickel can play a role that restrain the dense Zn(OH)2 to be converted into the loose ZnO. At the same time, the coatings resistance Rc and charge transfer resistance Rt are both being increased and causing the coatings corrosion current being decreased gradually with the accumulation of corrosion products. Corrosion resistances of these coatings with different nickel content are obviously different, and the anti-corrosion properties of the coating with 20 mass% Ni is best.
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Cite this article:
WANG Yingfa,HUANG Guosheng,CHENG Xudong,LI Xiangbo,XING Lukuo,GUO Juan,MA Yan. Research of Corrosion Behavior of Thermal Spraying Zn-Ni Composite Coating in Seawater. Journal of Chinese Society for Corrosion and protection, 2013, 33(1): 29-35.
URL:
https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y2013/V33/I1/29
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