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Materials
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Corrosion Electrochemistry and Protection of Metallic Materials
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Corrosion Electrochemistry and Protection of Metallic Materials

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Corrosion".

Deadline for manuscript submissions: 20 April 2025 | Viewed by 865

Special Issue Editors

Prof. Dr. Facundo Almeraya-Calderón

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Guest Editor
Center for Innovation and Research in Aeronautical Engineering, Faculty of Mechanical and Electrical Engineering, Autonomous University of Nuevo León, San Nicolás de los Garza 66455, Mexico
Interests: corrosion electrochemical; coating; failure analysis; aeronautical alloys; metallurgical engineering; corrosion protection
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Citlalli Gaona-Tiburcio

E-Mail Website
Guest Editor
Center for Innovation and Research in Aeronautical Engineering, Faculty of Mechanical and Electrical Engineering, Autonomous University of Nuevo León, San Nicolás de los Garza 66455, Mexico
Interests: corrosion electrochemical; coating; failure analysis; metallurgical engineering; corrosion protection
Special Issues, Collections and Topics in MDPI journals
Dr. Ricardo Galván-Martínez

E-Mail Website
Guest Editor
Instituto de Ingeniería, Universidad Veracruzana, Boca del Río 94294, Mexico
Interests: corrosion; coating; inhibitors; steel for oil industry

Special Issue Information

Dear Colleagues,

Metallic alloys are used in various industries such as automotive aerospace, aeronautic, chemical and naval. These industries have high requirements with few damage tolerances. As such, they necessitate the use of materials that present fatigue, mechanical and mainly corrosion resistance. Corrosion of materials in the industry is a major problem affecting economics, safety and logistical issues. The mechanic strength of metallic alloys is not sufficient to protect components exposed to aggressive environments. In both cases, this can be achieved via the optimization of alloy designs and metallurgical processes, as well as  appropriate corrosion control strategies, such as novel coating designs, which will help extend the service life of metallic materials.

This Special Issue covers investigations on corrosion electrochemistry and the protection of metallic materials, focusing on current trends in electrochemical corrosion science, engineering and technology, and aims to provide a comprehensive and multidisciplinary perspective on recent research studies related to metallic materials, where electrochemical techniques, corrosion mechanisms and corrosion protection methods are addressed. All articles related to electrochemical corrosion and methods of protection of metallic materials are welcome.

Prof. Dr. Facundo Almeraya-Calderón
Prof. Dr. Citlalli Gaona-Tiburcio
Dr. Ricardo Galván-Martínez
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. Materials is an international peer-reviewed open access semimonthly 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

  • stainless steels
  • superalloys
  • aluminum
  • titanium
  • electrochemical techniques
  • corrosion mechanisms
  • corrosion protection methods
  • coatings
  • corrosion inhibitor

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Published Papers (2 papers)

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Research

15 pages, 14975 KiB  
Article
In-Situ Coating of Iron with a Conducting Polymer, Polypyrrole, as a Promise for Corrosion Protection
by Jaroslav Stejskal, Marek Jurča, Miroslava Trchová, Jan Prokeš and Ivo Křivka
Materials 2024, 17(19), 4783; https://doi.org/10.3390/ma17194783 (registering DOI) - 29 Sep 2024
Abstract
Iron microparticles were coated with polypyrrole in situ during the chemical oxidation of pyrrole with ammonium peroxydisulfate in aqueous medium. A series of hybrid organic/inorganic core–shell materials were prepared with 30–76 wt% iron content. Polypyrrole coating was revealed by scanning electron microscopy, and [...] Read more.
Iron microparticles were coated with polypyrrole in situ during the chemical oxidation of pyrrole with ammonium peroxydisulfate in aqueous medium. A series of hybrid organic/inorganic core–shell materials were prepared with 30–76 wt% iron content. Polypyrrole coating was revealed by scanning electron microscopy, and its molecular structure and completeness were proved by FTIR and Raman spectroscopies. The composites of polypyrrole/carbonyl iron were obtained as powders and characterized with respect to their electrical properties. Their resistivity was monitored by the four-point van der Pauw method under 0.01–10 MPa pressure. In an apparent paradox, the resistivity of composites increased from the units Ω cm for neat polypyrrole to thousands Ω cm for the highest iron content despite the high conductivity of iron. This means that composite conductivity is controlled by the electrical properties of the polypyrrole matrix. The change of sample size during the compression was also recorded and provides a parameter reflecting the mechanical properties of composites. In addition to conductivity, the composites displayed magnetic properties afforded by the presence of iron. The study also illustrates the feasibility of the polypyrrole coating on macroscopic objects, demonstrated by an iron nail, and offers potential application in the corrosion protection of iron. The differences in the morphology of micro- and macroscopic polypyrrole objects are described. Full article
(This article belongs to the Special Issue Corrosion Electrochemistry and Protection of Metallic Materials)
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33 pages, 12834 KiB  
Article
Effect of Citric Acid Hard Anodizing on the Mechanical Properties and Corrosion Resistance of Different Aluminum Alloys
by José Cabral-Miramontes, Facundo Almeraya-Calderón, Ce Tochtli Méndez-Ramírez, Juan Pablo Flores-De los Rios, Erick Maldonado-Bandala, Miguel Ángel Baltazar-Zamora, Demetrio Nieves-Mendoza, María Lara-Banda, Gabriela Pedraza-Basulto and Citlalli Gaona-Tiburcio
Materials 2024, 17(17), 4285; https://doi.org/10.3390/ma17174285 - 29 Aug 2024
Viewed by 301
Abstract
Hard anodizing is used to improve the anodic films’ mechanical qualities and aluminum alloys’ corrosion resistance. Applications for anodic oxide coatings on aluminum alloys include the space environment. In this work, the aluminum alloys 2024-T3 (Al-Cu), 6061-T6 (Al-Mg-Si), and 7075-T6 (Al-Zn) were prepared [...] Read more.
Hard anodizing is used to improve the anodic films’ mechanical qualities and aluminum alloys’ corrosion resistance. Applications for anodic oxide coatings on aluminum alloys include the space environment. In this work, the aluminum alloys 2024-T3 (Al-Cu), 6061-T6 (Al-Mg-Si), and 7075-T6 (Al-Zn) were prepared by hard anodizing electrochemical treatment using citric and sulfur acid baths at different concentrations. The aim of the work is to observe the effect of citric acid on the microstructure of the substrate, the mechanical properties, the corrosion resistance, and the morphology of the hard anodic layers. Hard anodizing was performed on three different aluminum alloys using three citric–sulfuric acid mixtures for 60 min and using current densities of 3.0 and 4.5 A/dm2. Vickers microhardness (HV) measurements and scanning electron microscopy (SEM) were utilized to determine the mechanical characteristics and microstructure of the hard anodizing material, and electrochemical techniques to understand the corrosion kinetics. The result indicates that the aluminum alloy 6061-T6 (Al-Mg-Si) has the maximum hard-coat thickness and hardness. The oxidation of Zn and Mg during the anodizing process found in the 7075-T6 (Al-Zn) alloy promotes oxide formation. Because of the high copper concentration, the oxide layer that forms on the 2024-T6 (Al-Cu) Al alloy has the lowest thickness, hardness, and corrosion resistance. Citric and sulfuric acid solutions can be used to provide hard anodizing in a variety of aluminum alloys that have corrosion resistance and mechanical qualities on par with or better than traditional sulfuric acid anodizing. Full article
(This article belongs to the Special Issue Corrosion Electrochemistry and Protection of Metallic Materials)
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