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Coatings
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Powder and High-Solid Coatings
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Powder and High-Solid Coatings

A special issue of Coatings (ISSN 2079-6412). This special issue belongs to the section "Surface Characterization, Deposition and Modification".

Deadline for manuscript submissions: closed (31 January 2022) | Viewed by 27866

Printed Edition Available!
A printed edition of this Special Issue is available here.

Special Issue Editor

Prof. Stefano Rossi

E-Mail Website
Guest Editor
Department of Industrial Engineering, University of Trento, Trento, Italy
Interests: coatings for corrosion protection and perception properties
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Organic coatings are the most used and effective method to guarantee corrosion protection properties for metal alloys. In particular, for steel and alluminum alloys, paints could guarantee excellent protection and the physical appearance due to surface finishing and colors. Traditionally, for the application of paints, organic solvents are used in the production of Volatile Organic compounds (VOCs) and have a high impact on the environment and problems regarding safety during application. In the last few decades, several environmental protection regulations have searched for a way to reduce the emission of VOCs, which motivated researchers, professionals, and industry to develop solvent-free coatings technologies. In particular, powder organic coatings, in Europe, and high solid coatings in America, seem to guarantee the best performances with the lowest environmental impacts. These coatings tend to substitute traditional solvent paints in more and more applications. Considering the environmental impacts, these coatings are more suitable for protection of outdoor structures and indoor products, in particular in domestic applications. The development of deposition technologies and the increased quality of organic matters, different surface textures and a quasi-infinite color palette allow the use of this kind of paint in applications, not only for corrosion protection aspects, but also the aesthetic aspects.

In this regard, this Special Issue intends to publish original research and review papers, from investigators, academia and industry, considering all aspects and applications of powder and high solid organic coatings. Studies in the field of applications process, corrosion protection, aesthetical properties, weathering changes of properties, service life studies, comparison between accelerated laboratory test and natural weathering, examples of substitution of traditional solvent paints are encouraged. New polymeric matter, new textures and bioinspired surface effects are also welcome.

Prof. Dr. Stefano Rossi
Guest Editor

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

  • organic coatings;
  • environmental friendly paints;
  • colored paint;
  • high performances paints;
  • organic powder coatings;
  • solvent less paints;
  • low VOC paints;
  • aesthetical organic coatings;
  • corrosion protection properties;
  • accelerated test;
  • simulating aggressive environments.

Published Papers (7 papers)

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Editorial

Jump to: Research, Review

5 pages, 193 KiB  
Editorial
Powder and High-Solid Coatings
by Stefano Rossi
Coatings 2022, 12(6), 786; https://doi.org/10.3390/coatings12060786 - 07 Jun 2022
Cited by 1 | Viewed by 1587
Abstract
This Special Issue presents a series of research papers and reviews about the actual trend of powder and high solid coatings which show the advantage of great environmental sustainability by avoiding the massive use of organic solvents. Moreover, some very interesting studies exist [...] Read more.
This Special Issue presents a series of research papers and reviews about the actual trend of powder and high solid coatings which show the advantage of great environmental sustainability by avoiding the massive use of organic solvents. Moreover, some very interesting studies exist on the move from a simple protective layer to a smart coating with additional properties, both for the aesthetic and functional aspects. Full article
(This article belongs to the Special Issue Powder and High-Solid Coatings)

Research

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21 pages, 5623 KiB  
Article
Durability of Acrylic Cataphoretic Coatings Additivated with Colloidal Silver
by Massimo Calovi and Stefano Rossi
Coatings 2022, 12(4), 486; https://doi.org/10.3390/coatings12040486 - 04 Apr 2022
Cited by 11 | Viewed by 1952
Abstract
In this work, colloidal silver has been added into an acrylic clear cataphoretic bath, evaluating the effect of two different filler amounts on the durability of the composite coatings. The three series of samples were characterized by electron microscopy to assess the possible [...] Read more.
In this work, colloidal silver has been added into an acrylic clear cataphoretic bath, evaluating the effect of two different filler amounts on the durability of the composite coatings. The three series of samples were characterized by electron microscopy to assess the possible change in morphology introduced by the silver-based additive. The protective properties of the coatings were evaluated by a salt spray chamber exposure and electrochemical impedance spectroscopy measurements, evidencing the negative effect provided by high amount of silver, which introduced discontinuities in the acrylic matrix. Finally, the durability of composite coatings was studied by exposing them to UV-B radiation, observing a strong phenomenon of silver degradation. Although the coating containing high concentrations of silver demonstrated poor durability, this study revealed that small amounts of silver can be used to provide particular aesthetic features, but also to improve the protective performance of cataphoretic coatings. Full article
(This article belongs to the Special Issue Powder and High-Solid Coatings)
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12 pages, 2581 KiB  
Article
Influence of Graphene Oxide Additions on the Corrosion Resistance of a Rust Converter Primer
by Belén Díaz, Xosé Ramón Nóvoa, Carmen Pérez and Miguel Rodríguez-Morgado
Coatings 2022, 12(3), 345; https://doi.org/10.3390/coatings12030345 - 06 Mar 2022
Cited by 6 | Viewed by 1778
Abstract
Graphene oxide (GO) has attractive properties, such as a two-dimensional structure. Because of its hydrophilic characteristic, well-dispersed aqueous solutions are attained. Thus, it is easily incorporated into waterborne resins. For these reasons, in the last years GO nanoparticles have been added to polymers, [...] Read more.
Graphene oxide (GO) has attractive properties, such as a two-dimensional structure. Because of its hydrophilic characteristic, well-dispersed aqueous solutions are attained. Thus, it is easily incorporated into waterborne resins. For these reasons, in the last years GO nanoparticles have been added to polymers, improving corrosion resistance. This work is focused on the performance of a commercial rust converter (RC) doped with five different RC:GO ratios, namely, 1:0; 1:0.3; 1:0.6; 1:0.9; 1:1.2 (%v/v). The X-ray diffraction technique is used to illustrate the effect of RC and RC + GO additions in the iron oxides. Zeta-potential measurements are performed to assess the surface charge of the GO particles. The corrosion resistances of the rusted samples coated with the five rust converter formulations are studied. The electrochemical impedance spectroscopy (EIS) technique and an electrical equivalent circuit are utilized to explain the experimental results. Additionally, it is found that the optimal RC:GO ratio is between 1:0.3 and 1:0.6. The better corrosion resistance reached is that of the RC:0.3GO ratio. Full article
(This article belongs to the Special Issue Powder and High-Solid Coatings)
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15 pages, 6141 KiB  
Article
Study of the Durability and Aesthetical Properties of Powder Coatings Admixed with Pearlescent Pigments
by Stefano Rossi, Francesca Russo and Lotfi Bouchakour Rahmani
Coatings 2020, 10(3), 229; https://doi.org/10.3390/coatings10030229 - 03 Mar 2020
Cited by 7 | Viewed by 3601
Abstract
Powder coatings are commonly used to protect metallic substrates because of their good protection properties together with their aesthetical ones. In this work, the aesthetic and functional properties of powder coatings admixed with pearlescent pigments were investigated. The main aim of this work [...] Read more.
Powder coatings are commonly used to protect metallic substrates because of their good protection properties together with their aesthetical ones. In this work, the aesthetic and functional properties of powder coatings admixed with pearlescent pigments were investigated. The main aim of this work is represented by the evaluation of the coating properties and their change assessment after accelerated ageing treatments, such as UV and salt spray exposure. Changes in gloss, color and roughness were recorded before, during, and after UVA and UVB exposure. All the samples showed good resistance to UVA irradiation, whereas UVB light caused a huge variation in surface properties. Further insights on the degradation of the polymeric matrix were gained by exploiting FT-IR analyses, which could be correlated to the change of color. The protection properties of the coating were assessed by exploiting an acetic salt spray test. All the samples showed good resistance to aggressive environments, and no pigment effect on the degradation of the coatings could be detected. Full article
(This article belongs to the Special Issue Powder and High-Solid Coatings)
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14 pages, 5449 KiB  
Article
Investigation of the Performance of ATH Powders in Organic Powder Coatings
by Weihong Li, Diego Cárdenas Franco, Marshall Shuai Yang, Xinping Zhu, Haiping Zhang, Yuanyuan Shao, Hui Zhang and Jingxu Zhu
Coatings 2019, 9(2), 110; https://doi.org/10.3390/coatings9020110 - 12 Feb 2019
Cited by 9 | Viewed by 4892
Abstract
Aluminum trihydrate (ATH) is one of the most widely used fillers in solvent-borne coatings and polymer industries. To investigate its performance in powder coatings, four different pigment to binder ratios (P/B) were used in respect to different ATH concentrations in four most widely [...] Read more.
Aluminum trihydrate (ATH) is one of the most widely used fillers in solvent-borne coatings and polymer industries. To investigate its performance in powder coatings, four different pigment to binder ratios (P/B) were used in respect to different ATH concentrations in four most widely used resin systems (epoxy, epoxy-polyester, polyurethane and polyester). The angle of repose (AOR) and specific gravity of powder paints increase accordingly with ATH concentration. The mechanical properties, corrosion and UV resistance performances of coating films are enhanced or only slightly decreased with the addition of ATH. Pencil scratch hardness increase significantly with the increase of ATH content. Impact resistance decreases within 5% of the initial resistance at the maximum ATH loading. There is a slightly decrease in corrosion resistance performances of less than 2 mm of failure at scribe in all formulations. The incorporation of ATH has slight effect on the UV resistance performance of all the samples. Moreover, the matting effect of ATH is observed for all the resin systems, especially epoxy, with the specular gloss decreasing more than 70% at P/B of 0.75. Full article
(This article belongs to the Special Issue Powder and High-Solid Coatings)
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Review

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35 pages, 2797 KiB  
Review
Uses of Scanning Electrochemical Microscopy (SECM) for the Characterization with Spatial and Chemical Resolution of Thin Surface Layers and Coating Systems Applied on Metals: A Review
by Juan J. Santana, Javier Izquierdo and Ricardo M. Souto
Coatings 2022, 12(5), 637; https://doi.org/10.3390/coatings12050637 - 05 May 2022
Cited by 15 | Viewed by 3495
Abstract
Scanning Electrochemical Microscopy (SECM) is increasingly used in the study and characterization of thin surface films as well as organic and inorganic coatings applied on metals for the collection of spatially- and chemically-resolved information on the localized reactions related to material degradation processes. [...] Read more.
Scanning Electrochemical Microscopy (SECM) is increasingly used in the study and characterization of thin surface films as well as organic and inorganic coatings applied on metals for the collection of spatially- and chemically-resolved information on the localized reactions related to material degradation processes. The movement of a microelectrode (ME) in close proximity to the interface under study allows the application of various experimental procedures that can be classified into amperometric and potentiometric operations depending on either sensing faradaic currents or concentration distributions resulting from the corrosion process. Quantitative analysis can be performed using the ME signal, thus revealing different sample properties and/or the influence of the environment and experimental variables that can be observed on different length scales. In this way, identification of the earlier stages for localized corrosion initiation, the adsorption and formation of inhibitor layers, monitoring of water and specific ions uptake by intact polymeric coatings applied on metals for corrosion protection as well as lixiviation, and detection of coating swelling—which constitutes the earlier stages of blistering—have been successfully achieved. Unfortunately, despite these successful applications of SECM for the characterization of surface layers and coating systems applied on metallic materials, we often find in the scientific literature insufficient or even inadequate description of experimental conditions related to the reliability and reproducibility of SECM data for validation. This review focuses specifically on these features as a continuation of a previous review describing the applications of SECM in this field. Full article
(This article belongs to the Special Issue Powder and High-Solid Coatings)
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41 pages, 6099 KiB  
Review
Powder and High-Solid Coatings as Anticorrosive Solutions for Marine and Offshore Applications? A Review
by Krystel Pélissier and Dominique Thierry
Coatings 2020, 10(10), 916; https://doi.org/10.3390/coatings10100916 - 24 Sep 2020
Cited by 22 | Viewed by 9127
Abstract
The constant change in coating technology and environmental regulations has led to the development of low-solvent to solvent-free organic coatings, such as powder and high-solid coatings. These two technologies are well developed, but are still not the preferred choice when considering anticorrosive coating [...] Read more.
The constant change in coating technology and environmental regulations has led to the development of low-solvent to solvent-free organic coatings, such as powder and high-solid coatings. These two technologies are well developed, but are still not the preferred choice when considering anticorrosive coating for marine and offshore applications. This mostly arise from a lack of perspective in their long-term behavior and from the difficulty in their applications. This review’s principal aim is to describe powder and high-solid technologies from their formulation and application to their use in marine and offshore applications while recalling and giving key notions needed when the field of anticorrosive coatings is considered. First, the requirement for coatings to be called anticorrosive will be given alongside with their protection and failure mechanisms. The formulation and application for high-solid and powder coatings will be exposed followed by the description of the type of coating chemistry used in harsh environment. Finally, high-solid and powder coatings behavior in these types of environment will be discussed. Full article
(This article belongs to the Special Issue Powder and High-Solid Coatings)
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