Performance of Superhydrophobic Nano Complex Anti-corrosion Coating Fabricated by Sol-gel Technique

doi:10.11902/1005.4537.2013.146

Journal of Chinese Society for Corrosion and protection

2014, Vol. 34

Issue (3): 257-264 DOI: 10.11902/1005.4537.2013.146

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Performance of Superhydrophobic Nano Complex Anti-corrosion Coating Fabricated by Sol-gel Technique

YIN Chengyong, LI Cheng(

), PENG Xiaoyan, WANG Jiayu, WANG Yanhui, ZHENG Shunli, LI Min, HU Wei

College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China

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Abstract

Superhydrophobic complex coatings of mesoporous carbon/silica on stainless steel were prepared by a sol-gel spin cast method. The morphologies, anticorrosion property and hydrophobicity of the coatings were characterizd by means of scanning electron microscopy (SEM) and transmission electron microscopy (TEM), electrochemical test technique-Tafel curve and electrochemical impedance spectroscopy, as well as water contact angle measurement (CA) respectively. The coatings exhibited varied surface morphologies with bump-like and nipple-like protrusions on the stainless steel substrate. The coatings had a high water contact angle larger than 163°, indicating its strong hydrophobicity. The corrosion current density of the superhydrophobic complex coating coated steel was 8 order of magnitude lower than the bare steel, while its charge transfer resistance (R_ct) was 6 order of magnitude higher as well, implying an excellent corrosion protectiveness. Besides, an electrochemical equivalent circuit was proposed to interpret the relevant anti-corrosion mechanism for the superhydrophobic coatings.

Key words: superhydrophobic sol-gel complex coating anticorrosion

Received: 12 August 2013

ZTFLH:

TG174.4

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	Chengyong YIN
	Cheng LI
	Xiaoyan PENG
	Jiayu WANG
	Yanhui WANG
	Shunli ZHENG
	Min LI
	Wei HU

Cite this article:

YIN Chengyong, LI Cheng, PENG Xiaoyan, WANG Jiayu, WANG Yanhui, ZHENG Shunli, LI Min, HU Wei. Performance of Superhydrophobic Nano Complex Anti-corrosion Coating Fabricated by Sol-gel Technique. Journal of Chinese Society for Corrosion and protection, 2014, 34(3): 257-264.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2013.146 OR https://www.jcscp.org/EN/Y2014/V34/I3/257

Fig.1

有序介孔材料的合成过程示意图

Fig.2

介孔碳膜的TEM像

Fig.3

介孔碳复合涂层表面的SEM像

Fig.4

SiO₂/介孔碳复合涂层及表面SiO₂的SEM像

Fig.5

水滴在介孔碳涂层和SiO₂/介孔碳复合涂层上的静态接触角

Fig.6

裸钢片、介孔碳涂层及SiO₂/介孔碳复合涂层的Tafel极化曲线

Table 1 Corrosion current density, polarization resistance and corrosion potential obtained by fitting results of potentiodynamic polarization curves

Fig.7

裸钢片、介孔碳涂层和SiO₂/介孔碳复合涂层的电化学阻抗谱

Fig.8

基体 (裸钢片) 的等效电路图

Table 2 Fitting results of EIS of three different samples

Fig.9

杂化涂层的等效电路图

Fig.10

膜层的柔韧性能测试示意图

Fig.11

涂层的耐久性能测试

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