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Metals
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Surface Treatment and Coatings for Metals
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Surface Treatment and Coatings for Metals

A special issue of Metals (ISSN 2075-4701). This special issue belongs to the section "Corrosion and Protection".

Deadline for manuscript submissions: closed (30 September 2023) | Viewed by 5342

Special Issue Editor

Prof. Dr. Amany Mohammed Fekry

E-Mail Website
Guest Editor
1. CNRS, GeoRessources, Université de Lorraine, 54000 Nancy, France
2. Prof. of Physical Chemistry, Department of Chemistry, Faculty of Science, Cairo University, Giza 12613, Egypt
Interests: metals; alloys; corrosion; electrochemical impedance spectroscopy; nanoparticles; surface coatings; potentiodynamic polarization; SEM; EDX

Special Issue Information

Dear Colleagues,

The aim of this Special Issue is to study the performance of corrosion protection surface coatings for metals and/or alloys surfaces. For this purpose, chemically or electrochemically creating nano-composites on these metals or alloys surfaces is required.  Nano-composite coatings are preferred, using different nanoparticles, polymers and/or others. Such coatings should be characterized using scanning electron microscopy (SEM), Energy-Dispersive X-ray Analyses (EDX) and/or other analytical methods. Additionally, they should be tested electrochemically using potentiodynamic polarization, electrochemical impedance spectroscopy and/or others. Such studies should show that the nano-composite coatings applied on the metal surfaces can significantly enhance the corrosion resistance of the tested metal, such as magnesium, aluminum, steel, and/or alloys that are important industrially or biologically.

This Special Issue of Metals focuses on relationships among the compositions of nano-composite coatings and the characteristics of the tested metals and/or alloys. The papers presented in this Special Issue give an account of the current scientific and technological state of the art of these metals and/or alloys (see the Keywords/Topics below). Your contribution to this issue is highly valuable and appreciated. We invite you to contribute research work that studies the influence of synthesizing a novel nano-composite coating on the properties of these metals and/or alloys and its significance on protecting them. Contributions will be considered noteworthy if they represent a state of novelty in the world of metallic materials as well as in advanced nano-composite coating.

Prof. Dr. Amany Mohammed Fekry
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. Metals 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

  • metals
  • alloys
  • corrosion
  • electrochemical impedance spectroscopy
  • nanoparticles
  • surface coatings
  • potentiodynamic polarization
  • SEM
  • EDX

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

Published Papers (3 papers)

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Research

20 pages, 14154 KiB  
Article
Electrophoretic Deposition of Chitosan–Hydroxyapatite Films and Their Electrochemical Behavior in Artificial Plasma
by J. P. Mata-Davila, C. D. Arrieta-Gonzalez, F. J. Perez-Arizmendi, M. A. Dorta-Leon, F. Brown-Bojorquez and J. Porcayo-Calderon
Metals 2023, 13(11), 1828; https://doi.org/10.3390/met13111828 - 30 Oct 2023
Cited by 1 | Viewed by 1277
Abstract
The electrochemical behavior of chitosan–hydroxyapatite films deposited on Ti CP was evaluated. Hydroxyapatite was synthesized from eggshell at different precipitation pH conditions. The films were deposited on the Ti CP surface from chitosan–hydroxyapatite solutions by means of electrophoretic deposition. The hydroxyapatite content of [...] Read more.
The electrochemical behavior of chitosan–hydroxyapatite films deposited on Ti CP was evaluated. Hydroxyapatite was synthesized from eggshell at different precipitation pH conditions. The films were deposited on the Ti CP surface from chitosan–hydroxyapatite solutions by means of electrophoretic deposition. The hydroxyapatite content of the solutions varied from 0 to 20 g/L. The different films obtained were evaluated by means of electrochemical measurements such as polarization curves, open circuit potential measurements, polarization resistance, and electrochemical impedance. The results obtained showed that regardless of the precipitation pH, it is possible to obtain pure hydroxyapatite from a waste such as eggshell. The incorporation of hydroxyapatite within the chitosan structure allows for improvement of the electrochemical performance of the bare Ti CP surface. It was observed that the passive zone was achieved at lower current densities, and that the stability zone of the passive layer increased. Electrochemical impedance analyzes showed that there is an improvement in corrosion resistance due to a more controlled growth of the passive layer that allows for the formation of a dense and compact film. Full article
(This article belongs to the Special Issue Surface Treatment and Coatings for Metals)
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19 pages, 15016 KiB  
Article
Ultrasonic Cavitation Erosion Behavior of CoCrxFeMnNi High-Entropy Alloy Coatings Prepared by Plasma Cladding
by Kaige Zhang, Danqing Yin, Bin Wang, Maochang Li, Xiao Xiao, Ning Ma and Keke Zhang
Metals 2023, 13(3), 515; https://doi.org/10.3390/met13030515 - 3 Mar 2023
Cited by 2 | Viewed by 1491
Abstract
CoCrxFeMnNi (x represents the atomic percentage of Cr element, x = 20, 25, 30, and 35, denoted as Cr20, Cr25, Cr30, and Cr35 alloys) high-entropy alloy (HEA) coatings were cladded by plasma arc on the surface of 0Cr13Ni5Mo steel. The effects [...] Read more.
CoCrxFeMnNi (x represents the atomic percentage of Cr element, x = 20, 25, 30, and 35, denoted as Cr20, Cr25, Cr30, and Cr35 alloys) high-entropy alloy (HEA) coatings were cladded by plasma arc on the surface of 0Cr13Ni5Mo steel. The effects of Cr elements on the cavitation erosion mechanisms were studied by comparing the differences of microstructure, microhardness, cavitation erosion volume loss (CVL), cavitation erosion volume loss rate (CER), and eroded surface morphologies between the coatings. As the Cr content increased, the microhardness of the coatings increased continuously, and the microstructure transformed into fine dendrites. The microhardnesses of Cr20, Cr25, Cr30, and Cr35 were 223.9 HV, 250.5 HV, 265.2 HV, and 333.7 HV, respectively. With structural change, the slip pattern shifted from uniform distribution to distribution along the grain boundary, increasing slip resistance. Additionally, strain hardening capacity increased with reduced stacking fault energy (SFE). The resistance to cavitation erosion (CR) of the HEA increased with the increase in Cr content. The CVL of 20 h cavitation erosion of Cr35 coating was only 26.84% of that of 0Cr13Ni5Mo steel, and the peak CER was only 28.75% of that of 0Cr13Ni5Mo steel. The fracture damage mechanisms of the four HEA coatings were an obvious lamellar structure and fibrous fracture. Full article
(This article belongs to the Special Issue Surface Treatment and Coatings for Metals)
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13 pages, 2750 KiB  
Article
A Novel Nano-Composite CSNPs/PVP/CoONPs Coating for Improving Corrosion Resistance of Ti-6Al-4V Alloy as a Dental Implant
by Shymaa S. Medany, Renad S. Elkamel, Soha A. Abdel-Gawad and Amany M. Fekry
Metals 2022, 12(11), 1784; https://doi.org/10.3390/met12111784 - 23 Oct 2022
Cited by 5 | Viewed by 1888
Abstract
A new nano-coating of chitosan nanoparticles/polyvinylpyrrolidone/cobalt oxide nanoparticles (CSNPs/PVP/CoONPs) was performed in this work. The newly designed nano-coating comprises a copolymer and inorganic matrices. This nano-coating was used to cover the Ti-6Al-4V alloy surface as a newly designed dental alloy, and then its [...] Read more.
A new nano-coating of chitosan nanoparticles/polyvinylpyrrolidone/cobalt oxide nanoparticles (CSNPs/PVP/CoONPs) was performed in this work. The newly designed nano-coating comprises a copolymer and inorganic matrices. This nano-coating was used to cover the Ti-6Al-4V alloy surface as a newly designed dental alloy, and then its corrosion properties were studied through different electrochemical techniques. The results reveal that this novel coating improved the corrosion resistance of the Ti-6Al-4V alloy in artificial saliva solution by reaching 17.7 MΩ cm2. The new fabricated biocompatible coating (CSNPs/PVP/CoONPs) greatly enhanced the electrochemical corrosion resistance by giving a high protection efficiency of 90.87% and a low hydrogen evolution rate in artificial saliva solution at 37 °C. The observed results were confirmed by scanning electron microscopy (SEM), Vickers microhardness testing, coating thickness tests, high-resolution transmission electron microscopy (HRTEM), and energy-dispersive X-ray analysis (EDX). Full article
(This article belongs to the Special Issue Surface Treatment and Coatings for Metals)
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