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| Preparation and Properties of Superhydrophobizted Sprayed Zn-Al Coating |
Xiaodong SUN1,2,Gang LIU2,Longyang LI2,Eryong LIU2,Wencong LU1,**( ),Zhixiang ZENG2,**(),Xuedong WU2 |
1. College of Science, Shanghai University, Shanghai 200444, China
2. Key Laboratory of Marine Materials and Application and Zhejiang Key Laboratory of Marine Materials and Protective Technologies, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Science, Ningbo 315201, China |
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Cite this article:
Xiaodong SUN,Gang LIU,Longyang LI,Eryong LIU,Wencong LU,Zhixiang ZENG,Xuedong WU. Preparation and Properties of Superhydrophobizted Sprayed Zn-Al Coating. Chinese Journal of Materials Research, 2015, 29(7): 523-528.
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Abstract A superhydrophobic ZnAl coating was prepared by the electric arc spraying technology and then surface modification by stearic acid/ethanol. The surface wettability, morphology and chemical structure of the ZnAl coating before and after modification were characterized by contact angle measurement (OCA-20), scanning electron microscope (SEM) and artificial FTIR spectrometer (ATR), respectively. The impedance spectrum and polarization curves of the coatings were measuared by electrochemical workstation (Solartron Analytical) with three electrodes system. The results show that the as sprayed ZnAl coating consists of irregular micro- and nano-sized alloy particles and pores, and exhibits clear hydrophilicity, which may be ascribed to the high surface energy of metallic coating. After the surface modification with stearic acid, the static contact angle of the coating reached 153.8° with a rolling angle less than 10°, because there exsited a large number of hydrophobic long alkyl chains on the surface of the modified ZnAl coating. In addition, the surface modification could significantly enhance the corrosion resistance of ZnAl coating due to that the thin hydrophobic film plays an important role in supression of the fall off and dissolution of corrosion products on the ZnAl coating, leading to the increase of charge transfer resistance and the corrosion current density.
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Received: 25 November 2014
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| Fund: *Supported by the National Basic Research Program of China No. 2014CB643302, National Natural Science Foundation of China No. 51335010, China Postdoctoral Science Foundation No. 2014M551784, the Foundation for Selected Postdoctoral Project of Zhejiang Province No. BSH1401040, State Key Laboratory for Mechanical Behavior of Materials Foundation No. 20141605, Zhejiang Provincial Innovation Team No. 2011R50006 and Ningbo Municipal Nature Science Foundation No. 2014A610010. |
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