Special Issue "Superhydrophobic Coatings for Corrosion and Tribology"

A special issue of Coatings (ISSN 2079-6412).

Deadline for manuscript submissions: 30 June 2019

Special Issue Editors

Guest Editor
Dr. Shuncai Wang

School of Mechanical Engineering, University of Southampton, Southampton, SO17 1BJ, UK
Website | E-Mail
Interests: coatings; tribology; TEM/SEM; surface wetting
Guest Editor
Dr. Guochen Zhao

Key Laboratory for High Strength Lightweight Metallic Materials of Shandong Province, Shandong Academy of Sciences (SDAS), Jinan, China
E-Mail
Interests: superwettability properties; robust superhydrophobic coatings; antifouling anticorrosion films; superaerophilic electrodes; 3D printing

Special Issue Information

Dear Colleagues,

We would like to invite you to submit your work for a Special Issue on "Superhydrophobic Coatings for Corrosion and Tribology". Superhydrophobic surfaces, with a water contact angle >150°, have attracted both academic and industrial interest due to their wide range of applications, such as water proofing, anti-fogging, antifouling, anti-icing, fluidic drag reduction and anti-corrosion. Currently the majority of superhydrophobic coatings are created using organic chemicals with low surface energy. However, their lack of mechanical strength and heat resistance prevents the use of these coatings in harsh environments. Quality superhydrophobic coatings developed using inorganic materials are therefore highly sought after. Ceramics are of particular interest due to their high mechanical strength, heat and corrosion resistance. Such superhydrophobic coatings have recently been successfully fabricated using a variety of ceramics and different approaches, and have shown the improved wear and tribocorrosion resistance properties. This Special Issue will focus on the recent developments in the fabriction of superhydrophobic coatings and their robustness against corrosion and wear resistance, but original work on other properties of superhydrophobic coatings are also welcome.

In particular, the topics of interest include, but are not limited to:

  • Robust superhydrophobic coatings;
  • Coatings with super-wettability in multifunctional applications;
  • Wetting effects on corrosion and tribology;
  • Hierarchical Coating for wetting and modelling.

Dr. Shuncai Wang
Dr. Guochen Zhao
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All papers will be peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Coatings is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 1600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Published Papers (8 papers)

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Research

Open AccessArticle
Preparation of Superhydrophobic Steel Surfaces with Chemical Stability and Corrosion
Coatings 2019, 9(6), 398; https://doi.org/10.3390/coatings9060398
Received: 25 May 2019 / Revised: 16 June 2019 / Accepted: 18 June 2019 / Published: 20 June 2019
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Abstract
Corrosion seriously limits the long-term application of Q235 carbon steel. Herein, a simple fabrication method was used to fabricate superhydrophobic surfaces on Q235 carbon steel for anticorrosion application. The combination of structure and the grafted low-surface-energy material contributed to the formation of superhydrophobic [...] Read more.
Corrosion seriously limits the long-term application of Q235 carbon steel. Herein, a simple fabrication method was used to fabricate superhydrophobic surfaces on Q235 carbon steel for anticorrosion application. The combination of structure and the grafted low-surface-energy material contributed to the formation of superhydrophobic steel surfaces, which exhibited a water contact angle of 161.6° and a contact angle hysteresis of 0.8°. Meanwhile, the as-prepared superhydrophobic surface showed repellent toward different solutions with pH ranging from 1 to 14, presenting excellent chemical stability. Moreover, the acid corrosive liquid (HCl solution with pH of 1) maintained sphere-like shape on the as-prepared superhydrophobic surface at room temperature, indicating superior corrosion resistance. This work provides a simple method to fabricate superhydrophobic steel surfaces with chemical stability and corrosion resistance. Full article
(This article belongs to the Special Issue Superhydrophobic Coatings for Corrosion and Tribology)
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Open AccessArticle
Oscillating Magnetic Drop: How to Grade Water-Repellent Surfaces
Coatings 2019, 9(4), 270; https://doi.org/10.3390/coatings9040270
Received: 19 February 2019 / Revised: 3 April 2019 / Accepted: 17 April 2019 / Published: 21 April 2019
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Abstract
Evaluation of superhydrophobic (SH) surfaces based on contact angle measurements is challenging due to the high mobility of drops and the resolution limits of optical goniometry. For this reason, some alternatives to drop-shape methods have been proposed such as the damped-oscillatory motion of [...] Read more.
Evaluation of superhydrophobic (SH) surfaces based on contact angle measurements is challenging due to the high mobility of drops and the resolution limits of optical goniometry. For this reason, some alternatives to drop-shape methods have been proposed such as the damped-oscillatory motion of ferrofluid sessile drops produced by an external magnetic field. This approach provides information on surface friction (lateral/shear adhesion) from the kinetic energy dissipation of the drop. In this work, we used this method to compare the low adhesion of four commercial SH coatings (Neverwet, WX2100, Ultraever dry, Hydrobead) formed on glass substrates. As ferrofluid, we used a maghemite aqueous suspension (2% v/v) synthesized ad hoc. The rolling magnetic drop is used as a probe to explore shear solid–liquid adhesion. Additionally, drop energy dissipates due to velocity-dependent viscous stresses developed close to the solid–liquid interface. By fitting the damped harmonic oscillations, we estimated the decay time on each coating. The SH coatings were statistically different by using the mean damping time. The differences found between SH coatings could be ascribed to surface–drop adhesion (contact angle hysteresis and apparent contact area). By using this methodology, we were able to grade meaningfully the liquid-repelling properties of superhydrophobic surfaces. Full article
(This article belongs to the Special Issue Superhydrophobic Coatings for Corrosion and Tribology)
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Open AccessArticle
Super-Hydrophobic Co–Ni Coating with High Abrasion Resistance Prepared by Electrodeposition
Coatings 2019, 9(4), 232; https://doi.org/10.3390/coatings9040232
Received: 19 February 2019 / Revised: 23 March 2019 / Accepted: 29 March 2019 / Published: 2 April 2019
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Abstract
Although super-hydrophobic surfaces have great application prospects in industry, their preparation cost and mechanical durability have limited their practical utilization. In this work, we presented a new low-cost process preparation for super-hydrophobic Co–Ni coating on carbon steel substrate via an electrodeposition route. The [...] Read more.
Although super-hydrophobic surfaces have great application prospects in industry, their preparation cost and mechanical durability have limited their practical utilization. In this work, we presented a new low-cost process preparation for super-hydrophobic Co–Ni coating on carbon steel substrate via an electrodeposition route. The deposited Co–Ni coating with cauliflower-shaped micro-nano structures exhibited high super-hydrophobic properties with water contact angles over 161° after modification with 1H,1H,2H,2H-Perfluorooctyltrichlorosilane (PFTEOS). Evaluated by the linear abrasion methods, the super-hydrophobic coating can maintain super-hydrophobicity after abrasion distance of 12 m under the applied pressure of 5 kPa, which was attributed to the high cobalt content of the Co–Ni coating. Moreover, electrochemical tests showed that the super-hydrophobic Co–Ni coatings exhibited a good anti-corrosion performance thus providing an adequate protection to the carbon steel substrates. Full article
(This article belongs to the Special Issue Superhydrophobic Coatings for Corrosion and Tribology)
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Open AccessArticle
Synthesis and Properties of Electrodeposited Ni–Co/WS2 Nanocomposite Coatings
Coatings 2019, 9(2), 148; https://doi.org/10.3390/coatings9020148
Received: 17 January 2019 / Revised: 11 February 2019 / Accepted: 13 February 2019 / Published: 25 February 2019
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Abstract
Ni–Co coatings have gained widespread attention due to their potential in replacing hard chromium deposits (which have traditionally utilized toxic and corrosive chromic acid baths). A major challenge is to lower the high coefficient of friction of coated surfaces against steel, under dry [...] Read more.
Ni–Co coatings have gained widespread attention due to their potential in replacing hard chromium deposits (which have traditionally utilized toxic and corrosive chromic acid baths). A major challenge is to lower the high coefficient of friction of coated surfaces against steel, under dry sliding conditions. In this research, low friction Ni–Co/WS2 nanocomposite coatings have been prepared by a convenient, one-pot electrodeposition from aqueous Ni–Co plating baths containing WS2 particles. The embedment of the WS2 lubricants is found to reduce the friction coefficient of coating significantly, and an ultra-low friction coefficient of 0.16 is obtained for the coating having a WS2 content of 7.1 wt.%. Morphology and composition characterization of wear tracks reveal that the formation of a WS2-rich lubricating tribofilm on the contact surfaces is beneficial to a low friction coefficient and good oxidation resistance. The wettability of electrodeposited coatings was also investigated. Compared to pure Ni-Co coating, the Ni–Co/7.1 wt.% WS2 coating has an excellent hydrophobicity with a high water contact angle (WCA) of 157°, due to a rough surface with dual scale protrusions and the low surface energy of WS2. Full article
(This article belongs to the Special Issue Superhydrophobic Coatings for Corrosion and Tribology)
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Open AccessArticle
Surfactant-Free Electroless Codeposition of Ni–P–MoS2/Al2O3 Composite Coatings
Coatings 2019, 9(2), 116; https://doi.org/10.3390/coatings9020116
Received: 20 December 2018 / Revised: 1 February 2019 / Accepted: 10 February 2019 / Published: 13 February 2019
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Abstract
This paper presents the influence of an inorganic Al2O3 layer over MoS2 particles on the tribological performance of electroless Ni–P–MoS2/Al2O3 composite coatings fabricated without using surfactants. The Al2O3-coated MoS2 [...] Read more.
This paper presents the influence of an inorganic Al2O3 layer over MoS2 particles on the tribological performance of electroless Ni–P–MoS2/Al2O3 composite coatings fabricated without using surfactants. The Al2O3-coated MoS2 particles were prepared by a heterogeneous nucleation process. The dry sliding tests of the composite coatings were tested against a WC ball. SEM was used to observe the surface morphology of particles, composite coatings, and worn surfaces. The results indicate that the coverage of an Al2O3 coating on MoS2 particles significantly affects the surface morphology, frictional coefficient and wear loss of the composite coatings. The incorporation of Al2O3-coated MoS2 particles with lower coverage (up to 7% of Al2O3) could obtain compact surface structure of composite coatings, which contribute to reduced wear loss. However, higher coverage would lead to loose surface structure of the composite coatings, and thus increase their wear loss. Full article
(This article belongs to the Special Issue Superhydrophobic Coatings for Corrosion and Tribology)
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Open AccessArticle
Effects of Surface Microstructures on Superhydrophobic Properties and Oil-Water Separation Efficiency
Received: 16 December 2018 / Revised: 17 January 2019 / Accepted: 22 January 2019 / Published: 24 January 2019
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Abstract
In order to explore the effects of microstructures of membranes on superhydrophobic properties, it is critical, though, challenging, to study microstructures with different morphologies. In this work, a combination of chemical etching and oxidation was used and some copper meshes were selected for [...] Read more.
In order to explore the effects of microstructures of membranes on superhydrophobic properties, it is critical, though, challenging, to study microstructures with different morphologies. In this work, a combination of chemical etching and oxidation was used and some copper meshes were selected for grinding. Two superhydrophobic morphologies could be successfully prepared for oil-water separation: a parabolic morphology and a truncated cone morphology. The surface morphology, chemical composition, and wettability were characterized. The results indicated that the water contact angle and the advancing and receding contact angles of the parabolic morphology were 153.6°, 154.6° ± 1.1°, and 151.5° ± 1.8°, respectively. The water contact angle and the advancing and receding contact angles of the truncated cone morphology were 121.8°, 122.7° ± 1.6°, and 119.6° ± 2.7°, respectively. The separation efficiency of the parabolic morphology for different oil-water mixtures was 97.5%, 97.2%, and 91%. The separation efficiency of the truncated cone morphology was 93.2%, 92%, and 89%. In addition, the values of the deepest heights of pressure resistance of the parabolic and truncated cone morphologies were 21.4 cm of water and 19.6 cm of water, respectively. This shows that the parabolic morphology had good separation efficiency, pressure resistance, and superhydrophobic ability compared with the truncated cone morphology. It illustrates that microstructure is one of the main factors affecting superhydrophobic properties. Full article
(This article belongs to the Special Issue Superhydrophobic Coatings for Corrosion and Tribology)
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Open AccessArticle
Effect of Surface Topography and Structural Parameters on the Lubrication Performance of a Water-Lubricated Bearing: Theoretical and Experimental Study
Received: 14 October 2018 / Revised: 3 December 2018 / Accepted: 10 December 2018 / Published: 2 January 2019
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Abstract
This study explored the influence of the surface topography of a bushing on the lubrication performance of a water-lubricated bearing. Bushing deformations were considered in the mathematical model. Theoretical calculations and experiments were performed. The test data corresponded well with the simulation. The [...] Read more.
This study explored the influence of the surface topography of a bushing on the lubrication performance of a water-lubricated bearing. Bushing deformations were considered in the mathematical model. Theoretical calculations and experiments were performed. The test data corresponded well with the simulation. The main stiffness and cross stiffness coefficients were measured and compared with the theoretical values, and the empirical formula of friction coefficient was fitted based on the test data. Full article
(This article belongs to the Special Issue Superhydrophobic Coatings for Corrosion and Tribology)
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Open AccessArticle
Fabrication of Superhydrophobic AA5052 Aluminum Alloy Surface with Improved Corrosion Resistance and Self Cleaning Property
Coatings 2018, 8(11), 390; https://doi.org/10.3390/coatings8110390
Received: 10 September 2018 / Revised: 21 October 2018 / Accepted: 26 October 2018 / Published: 31 October 2018
Cited by 2 | PDF Full-text (3303 KB) | HTML Full-text | XML Full-text
Abstract
The development of a self-cleaning and corrosion resistant superhydrophobic coating for aluminum alloy surfaces that is durable in aggressive conditions has attracted great interest in materials science. In the present study, a superphydrophobic film was fabricated on an AA5052 aluminum alloy surface by [...] Read more.
The development of a self-cleaning and corrosion resistant superhydrophobic coating for aluminum alloy surfaces that is durable in aggressive conditions has attracted great interest in materials science. In the present study, a superphydrophobic film was fabricated on an AA5052 aluminum alloy surface by the electrodeposition of Ni–Co alloy coating, followed by modification with 6-(N-allyl-1,1,2,2-tetrahydro-perfluorodecyl) amino-1,3,5-triazine-2,4-dithiol monosodium (AF17N). The surface morphology and characteristics of the composite coatings were investigated by means of scanning electron microscopy (SEM), energy dispersive X-ray spectrum (EDS), atomic force microscope (AFM) and contact angle (CA). The corrosion resistance of the coatings was assessed by electrochemical tests. The results showed that the surface exhibited excellent superhydrophobicity and self-cleaning performance with a contact angle maintained at 160° after exposed to the atmosphere for 240 days. Moreover, the superhydrophobic coatings significantly improved the corrosion resistant performance of AA5052 aluminum alloy substrate in 3.5 wt.% NaCl solution. Full article
(This article belongs to the Special Issue Superhydrophobic Coatings for Corrosion and Tribology)
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