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Smart Coatings
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Smart Coatings

A special issue of Coatings (ISSN 2079-6412). This special issue belongs to the section "Plasma Coatings, Surfaces & Interfaces".

Deadline for manuscript submissions: 5 March 2025 | Viewed by 18583

Special Issue Editors

Dr. Łukasz Gierz

E-Mail Website
Guest Editor
Faculty of Mechanical Engineering, Poznan University of Technology, 60-965 Poznan, Poland
Interests: innovative machines and devices for the agri-food and forestry sector; DEM and FEM simulation studies; artificial intelligence; neural networks; machine learning; computer image analysis; SLA/DLP; mechanical and thermal properties; application of coatings in devices and machines; photopolymerization; photocurable coatings
Special Issues, Collections and Topics in MDPI journals
Dr. Mariola Robakowska

E-Mail Website
Co-Guest Editor
Institute of Chemical Technology and Engineering, Department of Polymers, Faculty of Chemical Technology, Poznan University of Technology, Berdychowo 4, PL-60965 Poznan, Poland
Interests: photopolymerization; photocurable coatings, kinetics of polymerization; SLA/DLP stereolithography; nanocompo-sites; hybrid polymeric materials; biomaterials; solid-state electrolyte; fillers
Special Issues, Collections and Topics in MDPI journals
Dr. Paulina Mayer

E-Mail Website
Guest Editor Assistant
Department of Lightweight Element Engineering, Foundry, and Automation, Faculty of Mechanical Engineering, Wroclaw University of Science and Technology, Wyspiańskiego 27, 50-370 Wroclaw, Poland
Interests: processing of polymers,production of polymer and composite coatings, technical composite polymer coatings,tests of mechanical properties of coatings, polyurea coatings

Special Issue Information

Dear Colleagues,

Recent theoretical and experimental developments in smart coatings are among the most widely explained aspects of corrosion science. There are many definitions for smart coatings; however, what they all have in common is the trait of being able to sense and interact with their environment (materials can respond to changes in light, chemicals, heat, and other stimuli). External stimuli in smart coatings may include properties such as anticorrosion, antifungal, anti-fingerprinting, antifouling, anti-microbiological, piezo-magnetic, self-healing, solar-reflective, or super-hydrophobic.

The purpose of this Special Issue is to collect high-quality articles in the fields of synthesis, characterization, and applications of smart coatings. Smart coatings are made of programmable materials with a variety of chemical, physical, electrical, biological, and mechanical properties. Potential topics include but are not limited to the synthesis, functionalization, and characterization of fillers and preparation and characterization of smart coating materials. The thematic scope includes smart polymer coatings, i.e., composite coatings with increased strength properties (resistance to impact, abrasion), superhydrophobic coatings, self-healing and self-repair coatings, anticorrosion coatings, fireproof coatings used on steel structures, multifunctional coating, and electromagnetic radiation absorbing coatings. Smart coatings combine functionality with design to offer the usual functions of coatings, such as protection and decoration, as well as unique functions based on environmental stimuli.

It is our pleasure to invite you to submit a manuscript to this Special Issue. Full papers, communications, and reviews are all welcome.

We look forward to receiving your contributions.

Dr Łukasz Gierz
Guest Editor

Dr Mariola Robakowska
co-Guest Editor

Dr Paulina Mayer
Guest Editor Assistant

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 submissions that pass pre-check are 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 2600 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.

Keywords

  • smart
  • coatings
  • preparation of coatings
  • hybrid polymeric material
  • properties of coatings
  • functions of coatings

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Published Papers (11 papers)

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Research

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15 pages, 11707 KiB  
Article
Experimental Study and Mechanism Analysis of the Influence of Micro-Dimple Geometry on the Adhesion Strength of Textured Coatings
by Hao Fu, Xiao Yang, Mei Mei, Jie Yang, Yanhu Zhang, Jinghu Ji and Yonghong Fu
Coatings 2024, 14(8), 973; https://doi.org/10.3390/coatings14080973 - 2 Aug 2024
Viewed by 694
Abstract
Textured coating technology is an effective method to improve the friction and wear performance of mold surfaces. The adhesion strength at the interface between the texture and the coating is crucial for its long-term serviceability. This paper studies the adhesion strength of micro-dimple’s [...] Read more.
Textured coating technology is an effective method to improve the friction and wear performance of mold surfaces. The adhesion strength at the interface between the texture and the coating is crucial for its long-term serviceability. This paper studies the adhesion strength of micro-dimple’s topography textured coatings, aiming to reveal the influence mechanism of micro-dimples on the adhesion strength of textured coating interfaces. Different diameters or texture area ratios of micro-dimples were prepared on the sample surface using a picosecond laser, followed by PVD coating deposition. Scratching tests and indentation tests were then conducted on the textured coating surface. The adhesion strength and crack propagation behavior of the coating on the surface of different samples were studied under dynamic and static contact conditions. The results showed that under dynamic contact conditions, the critical load for coating failure of most textured samples was higher than that of non-textured samples. As the depth and diameter of the micro-dimple’s topography increased, the critical load first increased and then decreased, with the maximum critical load being 14.9% higher than that of the non-textured samples. Under static contact conditions, almost no coating spalling was observed around the indentation on the surface of the micro-dimple’s topography textured coating, while the spalling areas of non-textured samples were mainly at the edges and surrounding areas of the indentation. In contrast, the spalling regions of the textured samples were primarily concentrated at the edges of the texture. It can be seen that the dimpled texture hinders crack propagation and reduces the interlocking network of cracks, thereby reducing coating spalling. The research results provide important theoretical guidance for the design and optimization of textured coatings on mold surfaces. Full article
(This article belongs to the Special Issue Smart Coatings)
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30 pages, 10269 KiB  
Article
Influence of Deposition Temperature and WC Concentration on the Microstructure of Electroless Ni-P-WC Nanocomposite Coatings with Improved Hardness and Corrosion Resistance
by Giulia Pedrizzetti, Virgilio Genova, Michelangelo Bellacci, Erica Scrinzi, Andrea Brotzu, Francesco Marra and Giovanni Pulci
Coatings 2024, 14(7), 826; https://doi.org/10.3390/coatings14070826 - 2 Jul 2024
Viewed by 870
Abstract
This study aims to develop Ni-P coatings with high P content (≥11 wt.%) reinforced with WC nanoparticles on F22 steel substrates. The introduction of conductive WC in the plating solution dramatically increases reactivity of the plating solution, and consequently a tuning of deposition [...] Read more.
This study aims to develop Ni-P coatings with high P content (≥11 wt.%) reinforced with WC nanoparticles on F22 steel substrates. The introduction of conductive WC in the plating solution dramatically increases reactivity of the plating solution, and consequently a tuning of deposition parameters, in terms of temperature and WC concentration, is required to obtain nanocomposite coatings with improved mechanical properties. The coatings’ porosity and incorporation and dispersion of the reinforcing phase as a function of temperature and WC concentration were analyzed by quantitative image analysis from Scanning Electron Microscopy (SEM) micrographs. Increasing the temperature and concentration of nanoparticles leads to a faster plating rate and a dramatic increase in both porosity and agglomeration of the reinforcing phase, with detrimental effects on the coatings’ microhardness. The best compromise between coating parameters was obtained by deposition at 70 °C and 6.5 g/L of WC, with a plating rate ≈ 12 μm/h, porosity lower than 1.5%, and a good combination between particle incorporation and agglomeration. In these conditions, a hardness increase by 34% is achieved in comparison to standard Ni-P. Coatings were then heat treated in air at 200 °C for 2 h, to induce growing stress relaxation, or 400 °C for 1 h, to study effects of crystallization and precipitation. X-Ray Diffraction (XRD) analysis demonstrated that WC introduction does not alter the microstructure of Ni-P coatings, but delays grain growth coarsening of precipitates. Hardness improvement by 6.5% and 45% is registered after treatment at 200 °C and 400 °C, respectively. An increase in elastic modulus, measured by instrumented indentation, was found in WC-reinforced coatings compared with Ni-P. Potentiodynamic polarization tests revealed that both introduction of WC nanoparticles and heat treatment also enhance corrosion resistance. Full article
(This article belongs to the Special Issue Smart Coatings)
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18 pages, 6769 KiB  
Article
Change of Adhesion Properties of Bioinspired Laser-Induced Periodic Nanostructures towards Cribellate Spider Nanofiber Threads by Means of Thin Coatings
by Johannes Heitz, Gerda Buchberger, Werner Baumgartner, Marco Meyer, Margret Weissbach, Anna-Christin Joel, Simona Brajnicov, Alexandra Palla-Papavlu and Maria Dinescu
Coatings 2024, 14(7), 790; https://doi.org/10.3390/coatings14070790 - 25 Jun 2024
Cited by 1 | Viewed by 1467
Abstract
We investigated the effect of additional continuous functional coatings, which changed the hydrophilic–hydrophobic properties of the surface without heavily influencing the surface topography at the nanoscale, on the antiadhesive properties of bioinspired laser-induced periodic nanostructures. These nanostructures mimic the antiadhesive structures on the [...] Read more.
We investigated the effect of additional continuous functional coatings, which changed the hydrophilic–hydrophobic properties of the surface without heavily influencing the surface topography at the nanoscale, on the antiadhesive properties of bioinspired laser-induced periodic nanostructures. These nanostructures mimic the antiadhesive structures on the silk-combing area on the legs of cribellate spiders, the calamistrum. The thin films were deposited by matrix-assisted laser deposition and characterized by infrared spectroscopy, X-ray photoelectron spectroscopy, water contact angle measurements, and adhesion tests using capture threads from the cribellate spider webs. In all cases, the nanoripples were preserved and these structured surfaces showed lower adhesion forces compared to flat controls, although not significant. However, this effect was totally overwhelmed by the difference between the adhesion forces on surfaces with different chemical compositions. The largest adhesion forces were observed on hydrophilic surfaces and the lowest ones on hydrophobic surfaces. The fact that the antiadhesion between nanofibers and the nano-structured areas depends strongly on the chemical composition of the surface can be explained by the specific adhesion between individual chemical groups due to frequency dependencies in the theory of van der Waals forces. However, explaining these adhesion properties just by the categories “hydrophilic” or “hydrophobic” is oversimplified. Full article
(This article belongs to the Special Issue Smart Coatings)
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17 pages, 2699 KiB  
Article
Terahertz Nondestructive Measurement of Heat Radiation Performance of Thermal Barrier Coatings Based on Hybrid Artificial Neural Network
by Zhou Xu, Changdong Yin, Yiwen Wu, Houli Liu, Haiting Zhou, Shuheng Xu, Jianfei Xu and Dongdong Ye
Coatings 2024, 14(5), 647; https://doi.org/10.3390/coatings14050647 - 20 May 2024
Viewed by 1117
Abstract
Effective control of the micro- and nanostructure of thermal barrier coatings is essential to enhance the thermal radiation performance of the coating, which helps to determine the remaining service life of the coating. This paper proposed a method to measure the radiation properties [...] Read more.
Effective control of the micro- and nanostructure of thermal barrier coatings is essential to enhance the thermal radiation performance of the coating, which helps to determine the remaining service life of the coating. This paper proposed a method to measure the radiation properties of thermal barrier coatings by terahertz nondestructive testing technique, using APS-prepared thermal barrier coatings as the object of study. Radiative properties were a comprehensive set of properties characterized by the diffuse reflectance, transmittance, and absorptance of the thermal barrier coating. The coating data in actual service were obtained by scanning electron microscopy and metallographic experiments, and the data were used as the simulation model critical value. The terahertz time-domain simulation data of coatings with different microstructural features were obtained using the finite-different time-domain (FDTD) method. In simulating the real test signals, white noise with a signal-to-noise ratio of 20 dB was added, and fast Fourier transform (FFT), short-time Fourier transform (STFT), and wavelet transform (WT) were used to reduce the noise and compare their noise reduction effects. Different machine learning methods were used to build the model, including support vector machine algorithm (SVM) and k-nearest neighbor algorithm (KNN). The principal component algorithm (PCA) was used to reduce the dimensionality of terahertz time-domain data, and the SVM algorithm and KNN algorithm were optimized using the particle swarm optimization algorithm (PSO) and the ant colony optimization algorithm (ACO), respectively, to improve the robustness of the system. The K-fold cross-validation method was used to construct the model to improve the adaptability of the model. It could be clearly seen that the novel hybrid PCA-ACO-SVM model had superior prediction performance. Finally, this work proposed a novel, convenient, nondestructive, online, safe and highly accurate method for measuring the radiation performance of thermal barrier coatings, which could be used for the judgment of the service life of thermal barrier coatings. Full article
(This article belongs to the Special Issue Smart Coatings)
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14 pages, 11084 KiB  
Article
Icephobic Coating Based on Epoxy/Polydimethylsiloxane Interpenetrating Polymer Network Gel
by Lin Zhao, Tianhui Hao, Qiang Xie, Yuan Tian, Jifeng Zhang and Haotian Guo
Coatings 2024, 14(1), 76; https://doi.org/10.3390/coatings14010076 - 5 Jan 2024
Cited by 1 | Viewed by 1579
Abstract
Ice accretion endangers the safety and reliability of equipment operation in frigid regions. Silicone polymer icephobic coatings present themselves as an effective strategy. However, they face durability challenges, which is a crucial foundation for expanding their application. In this work, a durable icephobic [...] Read more.
Ice accretion endangers the safety and reliability of equipment operation in frigid regions. Silicone polymer icephobic coatings present themselves as an effective strategy. However, they face durability challenges, which is a crucial foundation for expanding their application. In this work, a durable icephobic coating was prepared based on an epoxy/polydimethylsiloxane (PDMS) interpenetrating polymer network (IPN) gel. In the process, epoxy was used to improve mechanical performance. IPN technology was used to integrate PDMS and epoxy. Low-molecular-weight silicone oil was used to adjust the elastic modulus of the coating by reducing crosslinking. The mechanical properties, icephobicity and durability of the coatings were characterized through elastic modulus measurements, ice adhesion strength tests, and icing/deicing cycle tests, respectively. Results shows the ice adhesion strength of the epoxy/PDMS IPN gel coating was approximately 8 kPa when the elastic modulus was 0.18 MPa. Additionally, the epoxy/PDMS IPN gel has good durability, weather resistance, and substrate adhesion. After 25 icing/deicing cycle tests, the coating remained undamaged, and the ice adhesion strength was stable in the range of 3–14 kPa. Within the range of −5 to −30 °C, the ice adhesion strength of the coating was stable and less than 20 kPa. After 168 h of salt spray aging test, the ice adhesion strength of the coating was maintained at 48.72 ± 5.27 kPa. This can provide a reference for an icephobic coating design. Full article
(This article belongs to the Special Issue Smart Coatings)
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15 pages, 4179 KiB  
Article
Parylene-AlOx Stacks for Improved 3D Encapsulation Solutions
by Sébastien Buchwalder, Florian Bourgeois, Juan J. Diaz Leon, Andreas Hogg and Jürgen Burger
Coatings 2023, 13(11), 1942; https://doi.org/10.3390/coatings13111942 - 14 Nov 2023
Cited by 2 | Viewed by 1360
Abstract
The demand for ultra-tight encapsulation solutions with excellent barrier and high conformality properties has increased in recent years. To meet these challenges, thin-film barrier coatings have emerged as a promising solution. In this study, we investigate well-established silicon-based plasma-enhanced chemical vapor deposition (PECVD) [...] Read more.
The demand for ultra-tight encapsulation solutions with excellent barrier and high conformality properties has increased in recent years. To meet these challenges, thin-film barrier coatings have emerged as a promising solution. In this study, we investigate well-established silicon-based plasma-enhanced chemical vapor deposition (PECVD) and metal oxide atomic layer deposition (ALD) barrier coatings deposited at low temperatures (≤100 °C) regarding their abilities to address high-level 3D encapsulation applications. Various combinations of such layers are evaluated by measuring the water vapor transmission rate (WVTR) and considering the conformality properties. The impact and the benefits of the organic film integration, namely parylene VT4 grade, on the barrier performances is assessed. Among these combinations, parylene-AlOx stack emerges as one of the most effective solutions, obtaining a WVTR of 3.1 × 10−4 g m−2 day−1 at 38 °C and 90% relative humidity conditions. Full article
(This article belongs to the Special Issue Smart Coatings)
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17 pages, 8354 KiB  
Article
Effect of Magnesium Hydroxide and Aluminum Hydroxide as Thermal Barriers on the Flame-Retardant Behavior of Acrylic-Based Coating
by Giuseppe Scionti, Elpida Piperopoulos, Mario Atria, Luigi Calabrese and Edoardo Proverbio
Coatings 2023, 13(9), 1517; https://doi.org/10.3390/coatings13091517 - 28 Aug 2023
Cited by 4 | Viewed by 2155
Abstract
In the effort to improve fire safety in residential, industrial, or naval structures, the study of flame-retardant coatings has become increasingly interesting. Flame-retardant additives are definitely the most traveled route; however, often these additives are halogenated compounds that increase the amount of smoke [...] Read more.
In the effort to improve fire safety in residential, industrial, or naval structures, the study of flame-retardant coatings has become increasingly interesting. Flame-retardant additives are definitely the most traveled route; however, often these additives are halogenated compounds that increase the amount of smoke and toxic decomposition of the products during polymer combustion. It is necessary to develop new fire retardant (FR) agents that respect the environment and are safe for human health. This work aims to study two completely harmless hydroxides, Mg(OH)2 and Al(OH)3, added in low percentages (2 wt.%) to an already marketed acrylic polymer emulsion (79.2 wt.% of solid content, 37.3 wt.% and 41.8 wt.%, respectively, for polymer and fillers contents) in order to decrease the dangerous effects of these additives on the physical integrity and durability of the coatings. The hydroxides content was added in 6.2 wt.% and 5.6 wt.%, respectively, to polymer and total solids present in the emulsion. Flame exposure tests are conducted at different times (15 s and 30 s) to verify the flame stability and thermal insulation exerted by the investigated coatings. Furthermore, through a precise analysis of the areas damaged by the combustion process, it is possible to link the flame-retardant properties to the FR choice and its particle size, finding a promising solution in the sample based on small Mg(OH)2 particles for fire protection in naval applications. Full article
(This article belongs to the Special Issue Smart Coatings)
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18 pages, 8178 KiB  
Article
Comparative Analysis of Strength Fatigue Properties and Abrasive Wear Resistance for a New Composition of Polymer Concrete Coated with Metal Alloy Powders
by Tatyana Nikonova, Łukasz Gierz, Alexandra Berg, Vytautas Turla, Łukasz Warguła, Vassiliy Yurchenko, Gulnur Abdugaliyeva, Darkhan Zhunuspekov, Bartosz Wieczorek, Mariola Robakowska and Dandybaev Essim
Coatings 2023, 13(3), 586; https://doi.org/10.3390/coatings13030586 - 8 Mar 2023
Cited by 1 | Viewed by 1802
Abstract
The possibility of using powder spraying to improve the strength properties of polymer concrete products has been studied. Different compositions of polymer concrete mixtures have been compared and analyzed in order to find out the adhesive and cohesive properties of coatings. An analysis [...] Read more.
The possibility of using powder spraying to improve the strength properties of polymer concrete products has been studied. Different compositions of polymer concrete mixtures have been compared and analyzed in order to find out the adhesive and cohesive properties of coatings. An analysis of the stress-strain state under static loads has been carried out. To improve the tribological properties and wear resistance of critical parts of metal-cutting machine tools, such as beds, it is proposed to spray polymer concrete surfaces using the gas-thermal method. Two types of powder mixtures for spraying have been compared, and the adhesive properties of the analyzed coatings have been considered. The finite element method was used for the calculation of the abrasion resistance of polymer concrete models according to the proposed modification of Ni-7Cr-3Fe + 60% WC coating composition, which showed that the use of gas-thermal coating for polymer concrete is justified. Based on a simulation of adhesive peeling strength, it can be concluded that the wear coefficient of the coated sample is quite large. Under the impact of amplitude loads applied during 5 × 106 loading cycles with a high degree of wear equal to 1.5, the sample showed high safety margins equal to 0.67. The presence of a sprayed layer prevents the concentration of internal stresses in the area of polymer concrete, taking over the resulting stresses under an external force caused by the mechanical properties of the materials, thereby increasing the service life of a manufactured part. Full article
(This article belongs to the Special Issue Smart Coatings)
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13 pages, 2037 KiB  
Article
Preparation of the Surface of Long-Dimensional Rods of Hydro-Cylinders for Thermal Spraying Using an Abrasive Jet
by Gulnara Zhetessova, Tatyana Nikonova, Łukasz Gierz, Darkhan Zhunuspekov, Vassiliy Yurchenko and Olga Zharkevich
Coatings 2022, 12(10), 1514; https://doi.org/10.3390/coatings12101514 - 10 Oct 2022
Cited by 1 | Viewed by 1701
Abstract
Preliminary cleaning of the surface of hydraulic cylinder rods is of great importance for subsequent coating. The most widely used surface preparation for thermal spraying is jet-abrasive treatment. The shot blast modes provide the hardness and strength of the material being processed. The [...] Read more.
Preliminary cleaning of the surface of hydraulic cylinder rods is of great importance for subsequent coating. The most widely used surface preparation for thermal spraying is jet-abrasive treatment. The shot blast modes provide the hardness and strength of the material being processed. The impact of the abrasive makes the surface rough, increasing the contact area. Experimental studies of jet-abrasive processing of the hydraulic cylinder rod surface, as well as its activation for the thermal spraying, were carried out. The prepared surface of the rod for thermal spraying must meet the requirements for surface roughness and the size of the hardened layer at work. The experiments made it possible to identify the optimal modes of jet-abrasive treatment, which affect surface roughness and abrasive penetration of abrasive. To obtain the desired roughness values, it is preferable to use the following: a steel shot with an abrasive particle size in the range of 0.3–1.5 mm, taking the compressed air pressure in the range of 0.4–0.7 MPa; processing time—within 3.5–5 min; counterflow angle with the surface—70–90°; consumption of abrasive particles—300–500 kg/h. A special installation for jet-abrasive processing has been designed, which makes it possible to restore the surfaces of long rods by thermal spraying directly at the site of operation of the large machines. Full article
(This article belongs to the Special Issue Smart Coatings)
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13 pages, 5975 KiB  
Article
Influence of the Addition of Sialon and Aluminum Nitride Fillers on the Photocuring Process of Polymer Coatings
by Mariola Robakowska, Łukasz Gierz, Paulina Mayer, Katarzyna Szcześniak, Agnieszka Marcinkowska, Aneta Lewandowska and Piotr Gajewski
Coatings 2022, 12(10), 1389; https://doi.org/10.3390/coatings12101389 - 22 Sep 2022
Cited by 2 | Viewed by 1533
Abstract
This article presents the results of a study on polymer coatings containing poly ethoxylated bisphenol A diacrylate (Bis-AEA10) with aluminum silicon nitride oxide (Sialon) and aluminum nitride (AlN). The polymer coatings were obtained by the photopolymerization technique. Investigations were carried out to determine [...] Read more.
This article presents the results of a study on polymer coatings containing poly ethoxylated bisphenol A diacrylate (Bis-AEA10) with aluminum silicon nitride oxide (Sialon) and aluminum nitride (AlN). The polymer coatings were obtained by the photopolymerization technique. Investigations were carried out to determine the effect of the AlN and Sialon content on the UV-curing kinetics, as well as on the mechanical (hardness), thermal (Tg, thermal stability), physicochemical (water contact angle), and structural properties of the polymer coatings. Polymerization rates were characterized as functions of double-bond conversion using the photo-Differential Scanning Calorymetry technique (photo-DSC). The results obtained showed that a small addition of sialon filler (3–5 wt.%) to Bis-AEA10 increases the photopolymerization rate of the varnish, while the addition of more Sialon decreases the rate of photopolymerization. However, for the systems containing AlN filler, the maximum polymerization rate was observed for samples containing 10 wt.% filler. In the case of a varnish composition containing AlN, the maximum polymerization rate is characterized by the system containing 10 wt.% of AlN. This shows that the AlN filler has a good influence on the polymerization process. In either case, the final double bond conversion was high (80%–95%). Mechanical tests have shown that introducing the filler into the polymer matrix increases its hardness. The content of Sialon and AlN in the coatings causes an increase (up to 4–5 wt.%) and a decrease (>4–5 wt.%) in the glass transition temperature. The effect of the addition of fillers on the physicochemical properties of the coating surface has also been investigated and characterized by the water contact angle method. The addition of 20 wt.% Sialon and AlN increased the contact angle of the samples by approximately 40% and 31%, respectively, resulting in coatings with hydrophobic surface properties. Full article
(This article belongs to the Special Issue Smart Coatings)
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Review

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28 pages, 5396 KiB  
Review
Preparation and Applications of Superhydrophobic Coatings on Aluminum Alloy Surface for Anti-Corrosion and Anti-Fouling: A Mini Review
by Qianyi Zhu, Xiaoqing Du, Yudie Liu, Xuming Fang, Dongchu Chen and Zhao Zhang
Coatings 2023, 13(11), 1881; https://doi.org/10.3390/coatings13111881 - 1 Nov 2023
Cited by 2 | Viewed by 3101
Abstract
Aluminum alloy is widely used in many fields for its excellent performance. However, in practical application, aluminum alloy is easy to become corroded and be invalidated, owing to the influence of environmental factors. Some pollutants or corrosive media on its surface adhesion will [...] Read more.
Aluminum alloy is widely used in many fields for its excellent performance. However, in practical application, aluminum alloy is easy to become corroded and be invalidated, owing to the influence of environmental factors. Some pollutants or corrosive media on its surface adhesion will further deepen the failure rate of aluminum alloy, resulting in a large amount of workforce waste, waste of material and financial resources, and energy consumption. So the anti-corrosion and anti-fouling treatment of aluminum alloy surfaces to expand their practical application range and reduce energy loss are of great significance. In this paper, we first summarize the types of anti-corrosion and anti-fouling coatings on aluminum alloy surfaces. We found that superhydrophobic coating has attracted widespread attention recently because of its surface’s non-wetting and low surface energy characteristics. The superhydrophobic coating refers to a coating with a water contact angle on its surface greater than 150° and a sliding angle of less than 10°. Preparing superhydrophobic coatings on the surface of aluminum alloy can improve the corrosion resistance and anti-pollutant adhesion ability at the same time. Therefore, in the following part of the review, the preparation methods of superhydrophobic coatings on aluminum alloy surfaces for anti-corrosion and anti-fouling and the significant problems encountered in the practical application of the superhydrophobic coating on aluminum alloy surfaces, such as poor anti-corrosion durability and poor mechanical stability, and the existing methods to solve these critical problems, are summarized and discussed in detail. Finally, we put forward some new solutions to solve these vital issues. Full article
(This article belongs to the Special Issue Smart Coatings)
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