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Microstructure and Corrosion Behavior of High-Entropy Coatings
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Microstructure and Corrosion Behavior of High-Entropy 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: 31 December 2025 | Viewed by 2161

Special Issue Editor

Prof. Dr. Deen Sun

E-Mail Website
Guest Editor
School of Materials & Energy, Southwest University, Chongqing, China
Interests: hard yet tough nanocomposite thin films and coatings; diamond-like carbon (DLC) coatings; high-entropy coatings; functional decorative films; HiPIMS PVD coatings and their applications; surface and interface treatment for energy materials

Special Issue Information

Dear Colleagues,

In recent years, high-entropy alloy (HEA) coatings have attracted significant attention due to their unique design concept and excellent comprehensive performance. On that basis, high-entropy ceramic coatings (HECs) are formed by filling nitrogen, oxygen, and/or carbon atoms in the interstitial position of high-entropy alloy coatings, which process a stronger lattice distortion effect, thereby resulting in better mechanical and electrochemical properties.

In order to demonstrate the latest progress and achievement in this field, we are pleased to invite you to contribute articles covering the processes for coating deposition and modification, characterization techniques, corrosion resistance, and tribological properties.

This Special Issue aims to provide a comprehensive description of the microstructure and corrosion behavior of high-entropy coatings, as well as their performance and effective preparation.

For this Special Issue, original research articles and reviews are welcome. Research areas may include (but they are not limited to) the following:

  1. Nanostructured, nanocomposite, multilayer, and gradient coatings;
  2. Hard yet tough nitride/carbide coatings, high-entropy alloy (HEA) coatings, HEA nitride/carbide coatings, and diamond-like carbon coatings;
  3. Physical vapor deposition techniques, including high-power impulse magnetron sputtering (HiPIMS), filtered cathodic vacuum arcs (FCVAs), and pulsed laser deposition (PLD);
  4. Corrosion resistance of coatings, as well as the wear of coatings.

We look forward to receiving your contributions.

Prof. Dr. Deen Sun
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

  • high-entropy coatings
  • corrosion resistance
  • wear resistance
  • tribological properties
  • hardness
  • toughness
  • physical vapor deposition (PVD)
  • nanostructure
  • multilayer structure

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Further information on MDPI's Special Issue policies can be found here.

Published Papers (2 papers)

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Research

11 pages, 2575 KB  
Article
The Tribological Properties of the CoCrFeNiMn High-Entropy Alloy Matrix Composites with Solid Lubrication
by Zhiming Guo, Xiaoyan Ren, Jingdan Li and Guowei Zhang
Coatings 2025, 15(9), 1098; https://doi.org/10.3390/coatings15091098 - 19 Sep 2025
Viewed by 224
Abstract
CoCrFeNiMn HEA-based composites with Cr3C2, 15% Ag, and different mass fractions of CaF2/BaF2 eutectic fluoride were fabricated by spark plasma sintering. The tribological properties and wear mechanism of the composites were investigated from RT to 800 [...] Read more.
CoCrFeNiMn HEA-based composites with Cr3C2, 15% Ag, and different mass fractions of CaF2/BaF2 eutectic fluoride were fabricated by spark plasma sintering. The tribological properties and wear mechanism of the composites were investigated from RT to 800 °C. The friction coefficients of CoCrFeNiMn-Cr3C2-Ag-CaF2/BaF2 composites decrease from RT to 800 °C except for 400 °C. At 800 °C, with the increasing mass fraction of the eutectic fluoride, the friction coefficient of the composite decreases from 0.53 to 0.25. The wear rates of the composite with 15% CaF2/BaF2 eutectic fluoride decrease significantly at high temperatures. The CoCrFeNiMn-Cr3C2-Ag-15%CaF2/BaF2 composite exhibits the lowest wear rates at 400 °C, 600 °C, and 800 °C, which are 4.47 × 10−6 mm3/N·m, 5.15 × 10−6 mm3/N·m, and 2.42 × 10−6 mm3/N·m, respectively. At low temperatures, the tribological mechanisms of the composites are micro-plowing and micro-cutting, and Ag is formed as a lubricating film to reduce the friction coefficient. At high temperature, fluorides form a transfer film on the wear scar surface, providing a lubricating effect. Also, the oxide layers and chromate are formed on the worn surfaces of the composites, which are beneficial for improving the wear resistance. Based on the mechanical properties and tribological behavior, the CoCrFeNiMn-Cr3C2-Ag-15%CaF2/BaF2 composite demonstrates the best comprehensive properties. Full article
(This article belongs to the Special Issue Microstructure and Corrosion Behavior of High-Entropy Coatings)
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12 pages, 5462 KB  
Article
A Novel (AlCrNbTaTi)N Multilayer Hard High-Entropy Alloy Nitride Coating with Variable Aluminum Content Deposited by Cathodic Arc Ion Plating
by Zhihong Huang, Wenchang Lang, Yanming Chen, Bing Yang and Qiang Wan
Coatings 2025, 15(1), 76; https://doi.org/10.3390/coatings15010076 - 13 Jan 2025
Viewed by 1257
Abstract
Traditional binary coatings like TiN and CrN display limited thermal stability and wear resistance under extreme conditions. High-entropy alloy nitride (HEAN) coatings offer a promising solution due to their customizable composition and unique properties, including high hardness, corrosion resistance, and thermal stability. This [...] Read more.
Traditional binary coatings like TiN and CrN display limited thermal stability and wear resistance under extreme conditions. High-entropy alloy nitride (HEAN) coatings offer a promising solution due to their customizable composition and unique properties, including high hardness, corrosion resistance, and thermal stability. This study focused on (AlCrNbTaTi)N HEAN coatings to address a critical need for materials capable of enduring extreme mechanical and tribological demands by examining the impact of aluminum content on their structural and mechanical properties, providing insights for optimizing coatings in harsh conditions through a self-assembled nanolayer structure with enhanced resilience and performance. The coatings were deposited via a cathodic arc by employing an AlCrNbTaTi alloy target composed of aluminum (20, 50, 60, 70%) and equal molar ratios of Cr, Nb, Ta, and Ti. The coatings were characterized through grazing incidence X-ray diffraction, SEM, HR-TEM, a nano-indentation test, and a friction and wear test. The results indicated that with increasing Al content, the structure of (AlCrNbTaTi)N coatings shifted from FCC to an amorphous state, leading to a reduction in the hardness and elastic modulus, accompanied by an increase in the wear rate and friction coefficient. The (AlCrNbTaTi)N coating, with an equal atomic ratio of metallic elements, showed potential as a hard tool coating. It demonstrated outstanding mechanical and tribological properties, with a 34.5 GPa hardness, 369 GPa modulus, 0.35 friction coefficient, and 8.2 × 10−19 m2·N−1 wear rate. The findings highlight the potential of (AlCrNbTaTi)N coatings to extend tool life and improve operational efficiency, helping advance materials engineering for industrial applications. Full article
(This article belongs to the Special Issue Microstructure and Corrosion Behavior of High-Entropy Coatings)
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