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Metals
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Advances in Corrosion and Protection of Materials (Third Edition)
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Advances in Corrosion and Protection of Materials (Third Edition)

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

Deadline for manuscript submissions: 31 May 2025 | Viewed by 1073

Special Issue Editor

Prof. Dr. Renato Altobelli Antunes

E-Mail Website
Guest Editor
Center for Engineering, Modelling and Applied Social Sciences (CECS), Federal University of the ABC (UFABC), Santo André 09210-580, SP, Brazil
Interests: corrosion mechanisms; localized corrosion; corrosion-fatigue; local probe techniques; surface chemistry; biomedical alloys; magnesium alloys
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Corrosion affects modern civilization, impacting the costs of a variety of industry sectors. As concerns related to the safety and performance of materials evolve, knowledge about corrosion mechanisms and protection methods becomes increasingly important to support growing technological developments. The design of new materials and manufacturing methods must rely on a careful analysis of the corrosion resistance, especially on the correlation between chemical composition, processing parameters, metallurgical aspects, and surface characteristics. In this challenging scenario, corrosion research is crucial. Novel research fields have emerged in the past few years, bringing a huge amount of information on hot topics such as multiprinciple metallic alloys, additively manufactured alloys, friction stir-welded materials, localized corrosion processes studied by scanning probe techniques, biomedical alloys, and new protective coatings.

The aim of this Special Issue is to provide the readership of Metals with the most up-to-date research in the corrosion and protection of materials. The interests are particularly related to corrosion of novel metallic alloys, corrosion mechanisms, correlation between surface chemistry and corrosion, novel manufacturing methods (additive manufacturing and friction stir welding), effects of metallurgical aspects on corrosion (heat treatments, crystalline phases, microstructure, grain size, and texture), use of scanning probe techniques to study local corrosion processes, protective coatings, and surface treatments. We welcome reviews and research articles.

Prof. Dr. Renato Altobelli Antunes
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

  • multiprinciple alloys
  • biomedical alloys
  • scanning probe techniques
  • protective coatings
  • corrosion mechanisms
  • surface chemistry
  • additive manufacturing

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Related Special Issue

Published Papers (2 papers)

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Research

28 pages, 10930 KiB  
Article
Multi-Parameter Optimization and Corrosion Behavior of FeCoNiCrAl HEA Coatings via Laser Cladding
by Rang Chen, Chuanbo Zheng, Han Ma, Guo Yi, Dianchun Ju, Jiming Zhang, Xianjun Hu and Jincheng Wang
Metals 2025, 15(4), 406; https://doi.org/10.3390/met15040406 - 4 Apr 2025
Viewed by 179
Abstract
In this study, FeCoNiCrAl high-entropy alloy (HEA) coatings were fabricated on Q235 steel surfaces using laser cladding (LC) to enhance corrosion resistance in harsh environments. The laser processing parameters (laser power, defocus distance, and scanning speed) were optimized using response surface methodology (RSM), [...] Read more.
In this study, FeCoNiCrAl high-entropy alloy (HEA) coatings were fabricated on Q235 steel surfaces using laser cladding (LC) to enhance corrosion resistance in harsh environments. The laser processing parameters (laser power, defocus distance, and scanning speed) were optimized using response surface methodology (RSM), establishing a mathematical model to guide the process. The optimized coatings demonstrated strong metallurgical bonding to the substrate, with a microstructure comprising Al-Ni-rich B2 phases and Cr-Fe-rich BCC phases. Elemental segregation was effectively mitigated as energy density decreased, leading to significant improvements in corrosion resistance. Electrochemical tests in 3.5 wt.% NaCl and 0.5 mol/L H2SO4 solutions showed that the optimized coating (laser power: 800 W, scanning speed: 450 mm/min, defocus: −15 mm) exhibited exceptionally low corrosion current densities of 1.78 × 10−7 A/cm2 and 1.07 × 10−5 A/cm2, respectively. The passive film on the optimized coating surface consisted of stable oxides, with low oxygen vacancy densities of 1.937 × 1023 cm−3 in NaCl and 4.967 × 1021 cm−3 in H2SO4, significantly enhancing its resistance to localized and uniform corrosion. These results demonstrate the effectiveness of RSM-based optimization in producing HEA coatings with superior corrosion resistance suitable for applications in highly corrosive environments. Full article
(This article belongs to the Special Issue Advances in Corrosion and Protection of Materials (Third Edition))
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19 pages, 5751 KiB  
Article
Effect of the Use of Some Rare Earth Compounds as Corrosion Inhibitors for API 5L X70 Steel in Saline Medium
by Salvador Hernández García, Araceli Espinoza Vázquez, Laura Nadxieli Palacios-Grijalva, Anatolio Martínez Jiménez, Francisco Javier Rodríguez Gómez, Óscar Armando Gómez Vargas, Alan Miralrio, Miguel Castro and Ricardo Orozco Cruz
Metals 2025, 15(2), 195; https://doi.org/10.3390/met15020195 - 13 Feb 2025
Viewed by 657
Abstract
This work presents a comparative study of five rare earth compounds—Erbium nitrate pentahydrate lll (Er), Neodymium nitrate pentahydrate (Nd), Samarium III Nitrate Hexahydrate (Sm), Yterbium III Chloride Hexahydrate (Yb) and Praseodymium nitrate hexahydrate lll (Pr)—protecting API 5L X70 steel from corrosion in saline [...] Read more.
This work presents a comparative study of five rare earth compounds—Erbium nitrate pentahydrate lll (Er), Neodymium nitrate pentahydrate (Nd), Samarium III Nitrate Hexahydrate (Sm), Yterbium III Chloride Hexahydrate (Yb) and Praseodymium nitrate hexahydrate lll (Pr)—protecting API 5L X70 steel from corrosion in saline medium that uses electrochemical impedance spectroscopy (EIS) and polarization curves (CPs) at different concentrations and in static mode. The results show that Erbium is the best corrosion inhibitor, containing 50 ppm and reaching an inhibition efficiency of about 89%, and similar result was shown by Sm with an IE~87.9%, while the other rare earths (Nd, Yb and Pr) showed a decrease in corrosion protection at the same concentration, since they were below an IE~80%. On the other hand, with the Langmuir model it was possible to describe that the adsorption process of the three rare earths follows a combined physisorption–chemisorption process to protect the metal’s surface. The observed adsorption free energy, ΔG°ads, reaches −38.7 kJ/mol for Er, −34.4 kJ/mol for Nd, and −33.6 kJ/mol for Pr; whereas Sm and Yb have adsorption free energies of −33.9 and −35.0 kJ/mol, respectively. Scanning electron microscopy (SEM) and atomic force microscopy (AFM) further confirmed the formation of a protective film. Their characterization using density functional theory showed the transference of charge from the iron cluster towards the rare earth metal compounds. The adsorption process produced a slightly polarized region of interaction with the metal surface. Also, it was found that the adsorption of the rare earths affected the magnetic properties of the surface of the iron cluster. Quantum chemical descriptors, such as Pearson’s HSAB (Hard and Soft Acids and Bases) descriptors, were useful in predicting the behavior of the flow of electrons between the metal surface and the interacting rare earth ions. Full article
(This article belongs to the Special Issue Advances in Corrosion and Protection of Materials (Third Edition))
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