Electrochemical machining of superhydrophobic surfaces on mold steel substrates

SURFACE & COATINGS TECHNOLOGY

卷:344

Article

Song, Jinlong^1,2  Huang, Wenbo¹  Liu, Jiyu¹  Huang, Liu¹  Lu, Yao³ 

[1] Dalian Univ Technol, Minist Educ, Key Lab Precis & Nontradit Machining Technol, Dalian 116024, Peoples R China

[2] Dalian Univ Technol, Collaborat Innovat Ctr Major Machine Mfg Liaoning, Dalian 116024, Peoples R China

[3] UCL, Nanoengn Syst Lab, UCL Mech Engn, London WC1E 7JE, England

关键词: Superhydrophobic surface;    Electrochemical machining;    Mold steel;    Passive film;   

DOI  :  10.1016/j.surfcoat.2018.03.061

来源: Elsevier

【 摘 要 】

Superhydrophobic surfaces on mold steel substrates were fabricated via simple and environment-friendly electrochemical technology followed by fluoroalkylsilane (FAS) modification. The microstructure, crystal structure, chemical composition, and wettability of the sample surfaces were investigated using scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FTIR) and optical contact angle measuring instrument. The influences of current density and electrochemical machining time on wettability were also studied. The results show that, after the electrochemical processing, the mold steel substrates were covered with a layer of passive films, which have micro/ nano binary rough structures composed of rugged plateau structures and rupture-like shapes. Before fluorination, the obtained sample surfaces showed superhydrophilicity (the water contact angles were almost 0 degrees), while the sample surfaces became superhydrophobic (the water contact angles were 167.2 degrees and the water rolling angles were 4.3 degrees) after fluorination. The proposed method is simple, economical and environmental-friendly, and has great potential for large-scale industrial applications.

【 授权许可】

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