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Coatings
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Advanced Surface Modification, Properties, Performance and Analysis Technology
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Advanced Surface Modification, Properties, Performance and Analysis Technology

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 December 2023) | Viewed by 11078

Special Issue Editors

Dr. Essam B. Moustafa

E-Mail Website
Guest Editor
Mechanical Engineering Department, Faculty of Engineering, King Abdulaziz University (KAU), Jeddah P.O. Box 80204, Saudi Arabia
Interests: metals; surface composites; surface modification; friction stir welding/processing; microstructure; mechanical properties; materials characterization; wear; corrosion
Special Issues, Collections and Topics in MDPI journals
Dr. Alexey N. Solonin

E-Mail Website1 Website2 Website3
Guest Editor
Department of Physical Metallurgy of Non-Ferrous Metals, National University of Science & Technology (MISIS), Moscow, Russia
Interests: material characterization; materials mechanical properties; microstructure materials processing; advanced materials; heat treatment; metallurgical engineering; 3D printing; additive manufacturing; materials technology; powders alloys science education; recrystallisation powder technology; aluminum alloys; phase transformations; metal matrix composites; bulk metallic glasses; metal goams
Special Issues, Collections and Topics in MDPI journals
Dr. Ahmed Omar Mosleh

E-Mail Website1 Website2 Website3 Website4
Guest Editor
1. Department of Physical Metallurgy of Non-Ferrous Metals, National University of Science and Technology (MISIS), Moscow, Russia
2. Department of Mechanical Engineering, Faculty of Engineering at Shoubra, Benha University, Benha, Egypt
Interests: metals; surface modification; microstructure; mechanical properties; materials characterization; metallurgy; additive manufacturing; metal matrix composites; superplastic forming and sheet metal work; wear; corrosion; heat resistant alloys; Titanium alloys; alloy design; heat treatment of metals; metallurgy & metallurgical engineering; materials science
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

In recent decades, the growing demand for high performance, long lifetime, reliability of metallic parts, high energy efficiency, and low environmental impact has fueled the growth of surface modification technologies. It is our pleasure to invite you to submit your papers to the current Special Issue, entitled “Advanced Surface Modification, Properties, Performance and Analysis Technology”. Surface modification of metallic materials is achieved via friction stir processing, laser melting processing, and chemical treatments, while compositing the surface with nano-reinforcements aims to improve its characterizations. Surface coating technologies are considered to be a part of advanced surface modification; thus, articles on coatings are also welcome. Papers on microstructure analysis, hardness, tribology, and corrosion investigation of the modified surface are invited. The main goal of this issue is to highlight the visible approaches of surface modification for improving wear and corrosion resistance. Simultaneously, in addition to wear and corrosion investigations, the microstructure of the modified surface or surface composites is of particular importance.

The topics of interest of this Special Issue include but are not limited to the following:

  • Surface modification (laser melting processes, friction stir processing, chemical methods;
  • Surface compositing;
  • Surface characterizations research (microstructure, hardness, tribological analysis, corrosion, surface roughness;
  • Tribological coatings, wear and corrosion protection;
  • Surface characterization and tribo-testing.

Dr. Essam B. Moustafa
Dr. Alexey N. Solonin
Dr. Ahmed Omar Mosleh
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 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.

Published Papers (6 papers)

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Research

16 pages, 8173 KiB  
Article
Coatings Prepared by Electro-Spark Alloying with SHS Electrode Materials Based on Ti-B-Fe-AlN
by Anastasia Bolotskaia, Varvara Avdeeva, Pavel Bazhin, Maksim Mikheev, Alexander Stolin, Vseslav Novikov, Marina Kovaleva and Viacheslav Sirota
Coatings 2023, 13(7), 1264; https://doi.org/10.3390/coatings13071264 - 18 Jul 2023
Cited by 1 | Viewed by 1061
Abstract
In this work, the features of the phase composition, structures, and properties of coatings obtained on a high-speed steel substrate (steel R6M5) were studied. The coatings were prepared using the ESA method (electro-spark alloying). Electrode materials prepared through self-propagating high-temperature synthesis (SHS) based [...] Read more.
In this work, the features of the phase composition, structures, and properties of coatings obtained on a high-speed steel substrate (steel R6M5) were studied. The coatings were prepared using the ESA method (electro-spark alloying). Electrode materials prepared through self-propagating high-temperature synthesis (SHS) based on (Ti-B-Fe)xAlN with the addition of nanosized AlN particles in the amount of x = 0.5, 10, 15 wt % were used as electrodes. The structure, phase composition, and physical and mechanical properties of the SHS electrode materials are reported. It was found that the coatings inherited the structure of the SHS electrode material and formed two characteristic zones for x = 0 and three zones for x = 5, 10, 15. The surface hardness of the substrate made of the high-speed steel R6M5 with the developed coatings was found to increase up to five times compared to the uncoated substrate. It was found that the wear resistance of the samples with the coating was four to six times higher than that of uncoated samples. Full article
(This article belongs to the Special Issue Advanced Surface Modification, Properties, Performance and Analysis Technology)
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15 pages, 3513 KiB  
Article
Investigation of Microstructure, Residual Stress, and Hardness of Ti-6Al-4V after Plasma Nitriding Process with Different Times and Temperatures
by Goratouch Ongtrakulkij, Julathep Kajornchaiyakul, Katsuyoshi Kondoh and Anak Khantachawana
Coatings 2022, 12(12), 1932; https://doi.org/10.3390/coatings12121932 - 8 Dec 2022
Cited by 7 | Viewed by 1784
Abstract
The residual stress and hardness generated by the nitriding process are important parameters for increasing the bending fatigue strength to Ti-6Al-4V. Therefore, this research is focused on the analysis of residual stress and hardness, including surface morphology and microstructure generated by the nitriding [...] Read more.
The residual stress and hardness generated by the nitriding process are important parameters for increasing the bending fatigue strength to Ti-6Al-4V. Therefore, this research is focused on the analysis of residual stress and hardness, including surface morphology and microstructure generated by the nitriding process at different times and temperatures. The plasma nitriding at temperatures of 750 °C and 800 °C with times of 5 h and 10 h were selected in this research. After plasma nitriding, the material would have residual compressive stress and higher hardness, including changes in the surface morphology and microstructure. The results also indicated that higher temperature and processing times generated more surface roughness and thickness in the compound layer, resulting in higher surface hardness. Moreover, higher time and temperature could generate deeper residual compressive stress and case depth hardness. This research revealed maximum hardness in the cross-sectional analysis of 643 HV and residual compressive stress of −65.3 MPa. In conclusion, the depth of the residual stress and case depth hardness were well compatible with the depth of the diffusion layer of plasma-nitrided Ti-6Al-4V, which confirmed the effect of plasma nitriding. Full article
(This article belongs to the Special Issue Advanced Surface Modification, Properties, Performance and Analysis Technology)
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12 pages, 7819 KiB  
Article
Study on the Performance of Ag-Cu Bimetal SERS Substrate
by Xiaolong Song, Xiaoya Yan, Na Li, Lin Shen and Mingli Wang
Coatings 2022, 12(10), 1457; https://doi.org/10.3390/coatings12101457 - 2 Oct 2022
Cited by 2 | Viewed by 1437
Abstract
SERS has become a powerful trace detection technology, but its practical application is often limited by the fixed optical properties of cast metals (Au, Ag and Cu). In this paper, the bimetallic nanostructures prepared by changing the metal content ratio can regulate the [...] Read more.
SERS has become a powerful trace detection technology, but its practical application is often limited by the fixed optical properties of cast metals (Au, Ag and Cu). In this paper, the bimetallic nanostructures prepared by changing the metal content ratio can regulate the different optical responses of the substrate. In addition, it was found that the scale of moth wings (MW) with 3D grating-like uniform nanoarrays using bioscaffold can provide a consistently high-density ‘hot spot’ for the as-prepared plasmonic substrate. Here, two different methods (i) co-sputtered with different times and (ii) sputtered with sequentially alternating to form a stratified structure on the MW were employed for the fabrication of SERS-active substrates, and they were named AgCu@MW and Ag@Cu@MW, respectively. The comparison SERS measurement results of the above two substrates by using probe molecules R6G and MB show that the stratified structure of the Ag@Cu@MW-3 substrate has higher SERS performance. This strategy can not only prepare plasma substrates with on-demand optical responses but also provide new ideas for the preparation of conventional biomimetic nanomaterials. Full article
(This article belongs to the Special Issue Advanced Surface Modification, Properties, Performance and Analysis Technology)
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15 pages, 5813 KiB  
Article
Soft Sparking Discharge Mechanism of Micro-Arc Oxidation Occurring on Titanium Alloys in Different Electrolytes
by Qin Tang, Tao Qiu, Ping Ni, Dajun Zhai and Jun Shen
Coatings 2022, 12(8), 1191; https://doi.org/10.3390/coatings12081191 - 16 Aug 2022
Cited by 11 | Viewed by 2239
Abstract
Soft sparking during micro-arc oxidation can form a ceramic coating with high hardness and high bond strength on titanium alloy while avoiding the continuous strong micro-arc that can damage the substrate properties and the integrity of the coating. Existing studies have reported that [...] Read more.
Soft sparking during micro-arc oxidation can form a ceramic coating with high hardness and high bond strength on titanium alloy while avoiding the continuous strong micro-arc that can damage the substrate properties and the integrity of the coating. Existing studies have reported that the soft spark discharge is significantly influenced by the electrolyte anions, and the detailed mechanism of its influence remains unclear. Therefore, we considered four monolithic electrolytes, namely Na2B4O7, NaF, Na3PO4, and Na2SiO3, for the bipolar pulsed micro-arc oxidation (MAO) treatment of the Ti6Al4V alloy to investigate the mechanism of the soft sparking discharge and the affections of different electrolytes on the soft sparking discharge. The results showed that soft spark discharges were observed in both Na2SiO3 and Na3PO4 electrolytes while not in Na2B4O7 and NaF electrolytes. We attributed this situation to the fact that the deposition of Si and P elements in the coating changed the structure and passivation ability of the coating and affected the rate of ion transport and electron tunneling in the coating, resulting in forming a thick and dense, soft spark MAO inner layer. Additionally, the soft sparking discharge facilitated particle deposition and did not destroy the structure of the initial film layer, and also had no significant effect on the corrosion resistance. Full article
(This article belongs to the Special Issue Advanced Surface Modification, Properties, Performance and Analysis Technology)
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12 pages, 3900 KiB  
Article
The Dynamic and Flexural Behavior of Coated GFRP Rebars after Exposure to Elevated Temperatures
by Muhammad Basha, Essam B. Moustafa and Ammar Melaibari
Coatings 2022, 12(7), 902; https://doi.org/10.3390/coatings12070902 - 26 Jun 2022
Cited by 2 | Viewed by 1276
Abstract
The dynamic and flexural behavior of pultruded glass fiber reinforced polymer GFRP rebars were investigated after exposure to elevated temperatures ranging from room temperature to 290 °C. The rebars were cut and grouped into two sets. The first set contained the uncoated specimens, [...] Read more.
The dynamic and flexural behavior of pultruded glass fiber reinforced polymer GFRP rebars were investigated after exposure to elevated temperatures ranging from room temperature to 290 °C. The rebars were cut and grouped into two sets. The first set contained the uncoated specimens, and the second set enclosed the specimens that had been coated with a gun-sprayed thin layer of silicon matrix mixed with ceramic nanoparticles as an insulation medium. All specimens’ dynamic and flexural performances were experimentally performed after heating them inside the oven for 6 h and later cooled down outside the oven at room temperature for 24 h. The dynamic results of the coated specimens showed slight changes in the damping ratio due to the effectiveness of the coating layer. In contrast, the uncoated specimens showed a gradual increase in the damping ratio ranging from 12.5% to 43.1%. Similarly, the tested flexural strength of the coated specimens provided slight changes within the elevated temperatures, while the uncoated specimens showed a gradual decrease ranging from 3.9% to 6.4%. Full article
(This article belongs to the Special Issue Advanced Surface Modification, Properties, Performance and Analysis Technology)
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16 pages, 10161 KiB  
Article
Ag Nanoislands Modified Carbon Fiber Nanostructure: A Versatile and Ultrasensitive Surface-Enhanced Raman Scattering Platform for Antiepileptic Drug Detection
by Guochao Shi, Xue Han, Jungai Gu, Wenzhi Yuan, Kuihua Li, Liyong Wang, Wei Han and Jianjun Gu
Coatings 2022, 12(1), 4; https://doi.org/10.3390/coatings12010004 - 21 Dec 2021
Cited by 3 | Viewed by 2362
Abstract
A high-efficiency surface-enhanced Raman scattering (SERS) detection method with ultra-high sensitivity has been widely applied in drug component detection to optimize the product quality verification standards. Herein, a controllable strategy of sputtering Ag nanoislands on carbon fiber (C-fiber) via magnetron sputtering technology was [...] Read more.
A high-efficiency surface-enhanced Raman scattering (SERS) detection method with ultra-high sensitivity has been widely applied in drug component detection to optimize the product quality verification standards. Herein, a controllable strategy of sputtering Ag nanoislands on carbon fiber (C-fiber) via magnetron sputtering technology was proposed to fabricate a versatile Ag-C-fiber SERS active substrate. A wide range of multi-level electromagnetic enhancement “hot spots” distributed on Ag-C-fiber nanostructures can efficiently amplify Raman signals and the experimental enhancement factor (EEF) value was 3.871 × 106. Furthermore, substantial “hot spots” of large-scale distribution guaranteed the superior reproducibility of Raman signal with relative standard deviation (RSD) values less than 12.97%. Limit of detection (LOD) results indicated that when crystal violet (CV) is employed as probe molecule, the LOD was located at 1 × 10−13 M. By virtue of ultra-sensitivity and good flexibility of the Ag-C-fiber nanotemplate, Raman signals of two kinds of antiepileptic drugs called levetiracetam and sodium valproate were successfully obtained using an SERS-based spectral method. The Ag-C-fiber SERS detection platform demonstrated a good linear response (R2 = 0.97486) in sensing sodium valproate concentrations in the range of 1 × 103 ng/μL−1–1 ng/μL. We believe that this reliable strategy has potential application for trace detection and rapid screening of antiepileptic drugs in the clinic. Full article
(This article belongs to the Special Issue Advanced Surface Modification, Properties, Performance and Analysis Technology)
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