Preparation of a superhydrophobic TiN/PTFE composite film toward self-cleaning and corrosion protection applications
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Preparation of a superhydrophobic TiN/PTFE composite film toward self-cleaning and corrosion protection applications Lingwei Ma1,2,4,*, Jinke Wang1, Zhengjun Zhang2, Yue Kang3, Mingxian Sun4, and Li Ma4 1
National Materials Corrosion and Protection Data Center, Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China 2 Key Laboratory of Advanced Materials of Ministry of Education, Tsinghua University, Beijing 100084, China 3 Institute of Quartermaster Engineering and Technology, Beijing 100010, China 4 State Key Laboratory for Marine Corrosion and Protection, Luoyang Ship Material Research Institute (LSMRI), Qingdao 266237, China
Received: 20 July 2020
ABSTRACT
Accepted: 18 September 2020
A titanium nitride-polytetrafluoroethylene (TiN-PTFE) composite film was developed on Q235 steel surface to achieve the superhydrophobic property. The morphology and wettability of TiN-PTFE films were regulated by changing the deposition thickness during electron beam deposition, resulting in the optimized hydrophobicity with a water contact angle of * 157.8° and a sliding angle down to * 3.6°. The superhydrophobic TiN-PTFE film could easily clean the surface contaminations by water dropping, given the excellent self-cleaning performance. Electrochemical measurement results showed that the TiN-PTFE surface could efficiently strengthen the corrosion resistance of carbon steel in 3.5 wt% NaCl solution through the protective barrier and the air cushion trapped inside the coating. Besides, the superhydrophobic film exhibited good chemical stability in acid and alkaline solutions as well as remarkable mechanical durability against abrasion. This work offers an efficient and cost-effective strategy for the large-scale fabrication of superhydrophobic films. It is expected that the superhydrophobic TiN-PTFE film has promising prospects for self-cleaning and corrosion protection applications.
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Springer Science+Business
Media, LLC, part of Springer Nature 2020
Handling Editor: Chris Cornelius. Lingwei Ma and Jinke Wang have contributed equally to this work.
Address correspondence to E-mail: [email protected]
https://doi.org/10.1007/s10853-020-05364-1
J Mater Sci
GRAPHIC ABSTRACT
Introduction Superhydrophobic surfaces have attracted numerous research interests due to their remarkable performances in self-cleaning [1, 2], oil/water separation [3, 4], corrosion protection [5, 6], antifogging [7, 8] and antifouling [9, 10] applications. Typically, solid surfaces with a water contact angle (CA) greater than 150° and a sliding angle (SA) smaller than 10° are considered to be superhydrophobic [11, 12]. The inspiration for superhydrophobic surfaces originates from the famous lotus effect of some natural plants: here, the superhydrophobic property is derived from the micro–nano-structured surfaces and the exposed waxy substances [13–15]. Thus, increasing the surface roughness down to micro–nanoscale and reducing the surface energy can significantly strengthen the hydrophob
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