Recent progress in superhydrophobic coatings used for steel protection: A review

Fihri, Aziz; Bovero, Enrico; Alshahrani, Abdullah; Al-Ghamdi, Abdullah; Alabedi, Gasan

doi:10.1016/j.colsurfa.2016.12.057

Cited by 143 publications

(64 citation statements)

References 75 publications

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“…A. Fihri et al [188] published a review paper where the superhydrophobic coatings reported in the literature, until 2017, for steel protection, and their performances, were debated. The diverse models used to assess the wettability of a surface, and the approaches used to produce superhydrophobic coatings and their impacts on the corrosion mitigation of steel, were also revised.…”

Section: Coatings With Superhydrophobic Functionmentioning

confidence: 99%

Hybrid Sol–gel Coatings for Corrosion Mitigation: A Critical Review

Figueira

2020

Polymers

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The corrosion process is a major source of metallic material degradation, particularly in aggressive environments, such as marine ones. Corrosion progression affects the service life of a given metallic structure, which may end in structural failure, leakage, product loss and environmental pollution linked to large financial costs. According to NACE, the annual cost of corrosion worldwide was estimated, in 2016, to be around 3%-4% of the world's gross domestic product. Therefore, the use of methodologies for corrosion mitigation are extremely important. The approaches used can be passive or active. A passive approach is preventive and may be achieved by emplacing a barrier layer, such as a coating that hinders the contact of the metallic substrate with the aggressive environment. An active approach is generally employed when the corrosion is set in. That seeks to reduce the corrosion rate when the protective barrier is already damaged and the aggressive species (i.e., corrosive agents) are in contact with the metallic substrate. In this case, this is more a remediation methodology than a preventive action, such as the use of coatings. The sol-gel synthesis process, over the past few decades, gained remarkable importance in diverse areas of application. Sol-gel allows the combination of inorganic and organic materials in a single-phase and has led to the development of organic-inorganic hybrid (OIH) coatings for several applications, including for corrosion mitigation. This manuscript succinctly reviews the fundamentals of sol-gel concepts and the parameters that influence the processing techniques. The state-of-the-art of the OIH sol-gel coatings reported in the last few years for corrosion protection, are also assessed. Lastly, a brief perspective on the limitations, standing challenges and future perspectives of the field are critically discussed.Polymers 2020, 12, 689 The development of OIH sol-gel coatings, based on siloxanes, for corrosion mitigation, has been widely studied in the last few years [2,31,[36][37][38]. Numerous studies have been conducted since the early 1990s [39,40]. The studies performed showed that siloxanes were effective in mitigating the corrosion processes of different metallic substrates. This development was mainly due to the need for alternative environmentally friend materials and processes to replace the traditional chromium-based pre-treatments. Hexavalent chromium (Cr (VI)) is carcinogenic and shows high environmental toxicity and its use has been forbidden since 2006. However, Cr(VI) based pre-treatments improve the coating adherence to the substrate and are effective corrosion inhibitors [41][42][43] which make its replacement challenging. The use of the sol-gel method to produce OIH coatings for corrosion mitigation suits the main requirements of what should be an environmentally friendly process (i.e., excludes washing stages; it is a waste-free method) and allows one to obtain coatings with high purity and specific pore volumes and surface areas. Since it is a mild synthesis...

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Section: Coatings With Superhydrophobic Functionmentioning

confidence: 99%

Hybrid Sol–gel Coatings for Corrosion Mitigation: A Critical Review

Figueira

2020

Polymers

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“…Some superhydrophobic surfaces showing excellent self-cleaning properties could cause water even oil to roll-off leaving little or no residue and carry away surface contamination (Raza & Ding, 2013). In addition, superhydrophobic surfaces possessed many outstanding properties, such as water repellent, self-clean (Webb, Crawford, & Ivanova, 2014), anti-icing (Mishchenko et al, 2010), steel protection (Fihri, Bovero, Al-Ghamdi, & Alabedi, 2017), drag reduction (Dimitrakellis & Gogolides, 2018), and fog condensation (Liu et al, 2015;Lee, Choi, & Kim, 2016;Kim, Kim, Lee, & Kim, 2017) and so on. For thousands of years, the lotus leaf was a typical example of superhydrophobicity, exhibiting good superhydrophobic properties, so superhydrophobicity was also called lotus effect.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of superhydrophobic bionic surface integrating with VOF simulation studies of liquid drop impacting

Liu

Zhu

et al. 2019

Microscopy Res & Technique

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Superhydrophobic surface has wide application in self‐cleaning, anti‐pollution, anti‐adhesion, drag reduction, but the stable and efficient manufacture of bionic superhydrophobic surfaces is a challenge. We have reproduced the microscopic structure of natural plants and achieved superhydrophobic surface preparation without chemical modification by mechanical process. This program need many experiments to generate processing parameters based on the bionic surface structure. To solve this problem, based on the natural Green Bristlegrass superhydrophobic surface, an optimized bio‐inspired striped configuration was presented and the computational fluid dynamics approach was integrated into the fabrication, which was estimated the superhydrophobicity of bio‐inspired surface. The volume of fluid (VOF) model and the Level Set function were used to determine the position of the interface during the liquid impact process by solving the change of the volume fraction of each phase in the mixed fluid, thus tracking the gas–liquid phase interface. According to the simulation of striped surface structure, we have processed the bionic samples successfully and they showed an excellent superhydrophobic property, the contact angle was 154° ± 2° and the sliding angle was <5°. The contact time of bionic sample was 12.8 ms. This article used the VOF simulation method to evaluate the design and parameters of the structure, so that the selection of processing parameters were more optimized. Furthermore, the study was essential to access the bio‐inspired design and fabrication procedure of superhydrophobic surface.

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“…In addition, shark skin exhibits low drag property, which helps maintain self-cleaning property during swimming [4]. Inspired by shark skin, nanostructured hierarchical surfaces were fabricated on polypropylene, producing a hydrophilic surface [5].…”

Section: Introductionmentioning

confidence: 99%

Wettability Characteristics of Laser Surface Textured Plasma Sprayed TiO<sub>2</sub>/ZnO Coatings

et al. 2019

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Surface wettability behaviour is generally categorised as hydrophobic and hydrophilic depending on the contact angle value. Surface wettability has been attracting considerable attention in research due to its unique behaviour in the field of self-cleaning, anti-fouling and anti-corrosion. Surfaces with high and low wettabilities can be fabricated using various methods, including chemical etching, anodisation and laser surface texturing. The present study investigated the effects of textured surfaces via laser surface texturing on the wettability properties of TiO 2 /ZnO coatings. TiO 2 /ZnO coating was selected due to its high photocatalytic activity, non-toxicity and low cost, which are essential properties for self-cleaning and anti-fouling applications. Picosecond laser ablation was used to produce microdimple textures on the coating surfaces. The wettability of the laser-textured surfaces was greatly reduced, achieving superhydrophilic properties with contact angle of 1.4° ± 2.42° for laser-textured TiO 2 coating. On the other hand, coatings with ZnO compositions exhibited increased contact angles for both textured and non-textured surfaces. Moreover, no clear cut correlations between the surface roughness properties of non-textured and laser-textured TiO 2 /ZnO coatings and the surface wettability properties was observed. This finding provides new approaches in designing textured surface materials that can effectively increase the wettability properties for selfcleaning and anti-fouling applications.

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Recent progress in superhydrophobic coatings used for steel protection: A review

Cited by 143 publications

References 75 publications

Hybrid Sol–gel Coatings for Corrosion Mitigation: A Critical Review

Hybrid Sol–gel Coatings for Corrosion Mitigation: A Critical Review

Fabrication of superhydrophobic bionic surface integrating with VOF simulation studies of liquid drop impacting

Wettability Characteristics of Laser Surface Textured Plasma Sprayed TiO<sub>2</sub>/ZnO Coatings

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