Fabrication and Anti-corrosion Performance of Super-hydrophobic Surface Film on Q235 Steel Substrate

doi:10.11902/1005.4537.2016.182

Journal of Chinese Society for Corrosion and protection

2016, Vol. 36

Issue (6): 617-623 DOI: 10.11902/1005.4537.2016.182

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Fabrication and Anti-corrosion Performance of Super-hydrophobic Surface Film on Q235 Steel Substrate

Fangming ZHANG^1,²,Zhixiang ZENG¹(

),Gang WANG¹,Junjun CHEN¹,Yong XU¹,Liping WANG¹

1. Zhejiang Key Laboratory of Marine Materials and Protection Technology, Key Laboratory of Marine New Materials and Related Technology, Ningbo Institute of Material Technology & Engineering, Chinese Academy of Sciences, Ningbo 315201, China;
2. College of Chemistry and Chemical Engineering, Yantai University, Yantai 264005, China

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Abstract

A superhydrophobic surface film on Q235 steel substrate was prepared by chemical etching and then applying a film with low energy. The surface roughness and wettability of the steel prepared by chemical etching were characterized by scanning electron microscopy (SEM), confocal laser scanning microscopy (CLSM) and contact angle measuring instrument. The concentration of nitric acid in the etching liquid plays a major role for the surface roughness of the steel. With the increase of the nitric acid concentration in the etching solution, the surface roughness of the steel increased in the beginning stage and then decreased. Among others, the steel surface etched with 20%(mass fraction) HNO₃ is the best for further processing. Then the superhydrophobic surface film was then fabricated by applying the low surface energy film of polydimethylsiloxane (PDMS) on the chemical etched steel. The result revealed that the as-prepared superhydrophobic surface exhibits a contact angle of 163° and excellent corrosion resistance in 3.5%NaCl solution, which may be attributed to the synergistic effect of an air film on the superhydrophobic surface, the PDMS film itself and the hydrophobic steel surface.

Key words: etching roughness PDMS superhydrophobic surface corrosion protection

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	Fangming ZHANG
	Zhixiang ZENG
	Gang WANG
	Junjun CHEN
	Yong XU
	Liping WANG

Cite this article:

Fangming ZHANG,Zhixiang ZENG,Gang WANG,Junjun CHEN,Yong XU,Liping WANG. Fabrication and Anti-corrosion Performance of Super-hydrophobic Surface Film on Q235 Steel Substrate. Journal of Chinese Society for Corrosion and protection, 2016, 36(6): 617-623.

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https://www.jcscp.org/EN/10.11902/1005.4537.2016.182 OR https://www.jcscp.org/EN/Y2016/V36/I6/617

Fig.1 Schematic illustration of the preparation process of SAMs on substrate with micro/nano-structures

Fig.2 Relationship of etchant concentration of nitric acid and surface roughness of metal substrate

Fig.3 3D morphology images of Q235 steel substrate surfaces etched by 0% (a), 15%(b), 20% (c), 25% (d), 30% (e), 40% (f), 60% (g) and 100% (h) HNO₃

Fig.4 Relationship of etchant concentration of ethyl alcohol and surface roughness of Q235 steel substrates

Fig.5 3D morphology images of Q235 steel substrate surfaces etched by 0% (a), 20% (b), 40% (c), 60% (d), 80% (e) and 100% (f) ethyl alcohol

Fig.6 Contact angles of various Q235 steel surfaces afterchemical etching with different concentration of HNO₃

Fig.7 SEM images of metal surfaces after etched by 0% (a), 15% (b), 20% (c), 25% (d), 30% (e), 40% (f), 60% (g), 80% (h) and 100% (i) HNO₃

Fig.8 Contact angles of inched metal surfaces modified by PDMS

Fig.9 Potentiodynamic polarization curves of samples (a) and Bode plots of substrates (b) after soaking in 3.5%NaCl aqueous solution for 2 h

Table 1 E_corr and I_corr of various substrates after immersion in 3.5%NaCl aqueous solution for 2 h

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