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Metals
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Corrosion without Limit: From Past to Future
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Corrosion without Limit: From Past to Future

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

Deadline for manuscript submissions: closed (31 December 2021) | Viewed by 5285

Special Issue Editor

Dr. Julia Claudia Mirza-Rosca

E-Mail Website
Guest Editor
Nanomaterials and Corrosion Group, Mechanical Engineering Department, University of Las Palmas de Gran Canaria, Campus Universitario Tafira, Edificio Ingenieria, 35017 Las Palmas de Gran Canaria, Spain
Interests: corrosion; electrochemical and mechanical testing; materials characterization; high-entropy alloys; titanium alloys; microstructure of materials
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

We are pleased to inform you that Metals is now accepting submissions, and the Editorial Board would like to encourage you to submit your research results to this Special Issue titled “Corrosion without Limits: From Past to Future”. This issue is dedicated to and aimed at service behavior of all types of materials, and this includes areas such as materials selection, passivity, ability to prevent failures, biomedical corrosion, mechanism and methods of corrosion control, etc.

Your contribution is of great importance for us, and it will help the journal to maintain its high standards.

Anticipating your valuable response,

Dr. Julia Claudia Mirza-Rosca
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

  • Passivity
  • Corrosion rate
  • Titanium alloys
  • High-Entropy alloys
  • Biomaterials
  • EIS
  • SEM

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Published Papers (2 papers)

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Research

14 pages, 4741 KiB  
Article
Structure, Corrosion Resistance, Mechanical and Tribological Properties of ZrB2 and Zr-B-N Coatings
by Philipp Kiryukhantsev-Korneev, Alina Sytchenko, Yuriy Kaplanskii, Alexander Sheveyko, Stepan Vorotilo and Evgeny Levashov
Metals 2021, 11(8), 1194; https://doi.org/10.3390/met11081194 - 27 Jul 2021
Cited by 11 | Viewed by 2137
Abstract
The coatings ZrB2 and Zr-B-N were deposited by magnetron sputtering of ZrB2 target in Ar and Ar–15%N2 atmospheres. The structure and properties of the coatings were investigated via scanning and transmission electron microscopy, energy dispersion analysis, optical profilometry, glowing discharge [...] Read more.
The coatings ZrB2 and Zr-B-N were deposited by magnetron sputtering of ZrB2 target in Ar and Ar–15%N2 atmospheres. The structure and properties of the coatings were investigated via scanning and transmission electron microscopy, energy dispersion analysis, optical profilometry, glowing discharge optical emission spectroscopy and X-ray diffraction analysis. Mechanical and tribological properties of the coatings were investigated using nanoindentation, “pin-on-disc” tribological testing and “ball-on-plate” impact testing. Free corrosion potential and corrosion current density were measured by electrochemical testing in 1 N H2SO4 and 3.5%NaCl solutions. The oxidation resistance of the coatings was investigated in the 600–800 °C temperature interval. The coatings deposited in Ar contained 4–11 nm grains of the h-ZrB2 phase along with free boron. Nitrogen-containing coatings consisted of finer crystals (1–4 nm) of h-ZrB2, separated by interlayers of amorphous a-BN. Both types of coatings featured hardness of 22–23 GPa; however, the introduction of nitrogen decreased the coating’s elastic modulus from 342 to 266 GPa and increased the elastic recovery from 62 to 72%, which enhanced the wear resistance of the coatings. N-doped coatings demonstrated a relatively low friction coefficient of 0.4 and a specific wear rate of ~1.3 × 10−6 mm3N−1m−1. Electrochemical investigations revealed that the introduction of nitrogen into the coatings resulted in the decrease of corrosion current density in 3.5% NaCl and 1 N H2SO4 solution up to 3.5 and 5 times, correspondingly. The superior corrosion resistance of Zr-B-N coatings was related to the finer grains size and increased volume of the BN phase. The samples ZrB2 and Zr-B-N resisted oxidation at 600 °C. N-free coatings resisted oxidation (up to 800 °C) and the diffusion of metallic elements from the substrate better. In contrast, Zr-B-N coatings experienced total oxidation and formed loose oxide layers, which could be easily removed from the substrate. Full article
(This article belongs to the Special Issue Corrosion without Limit: From Past to Future)
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14 pages, 1319 KiB  
Article
Comparative EIS Study of AlxCoCrFeNi Alloys in Ringer’s Solution for Medical Instruments
by Pedro P. Socorro-Perdomo, Néstor R. Florido-Suárez, Ionelia Voiculescu and Julia C. Mirza-Rosca
Metals 2021, 11(6), 928; https://doi.org/10.3390/met11060928 - 7 Jun 2021
Cited by 25 | Viewed by 2364
Abstract
Depending on the properties required for the medical instruments, compared with the classical materials, the high-entropy alloys (HEAs) are a versatile option. Electrochemical Impedance Spectroscopy (EIS) measurements have been performed on AlxCoCrFeNi-type high-entropy alloys with various concentrations of Al content ( [...] Read more.
Depending on the properties required for the medical instruments, compared with the classical materials, the high-entropy alloys (HEAs) are a versatile option. Electrochemical Impedance Spectroscopy (EIS) measurements have been performed on AlxCoCrFeNi-type high-entropy alloys with various concentrations of Al content (x = 0.6, 0.8, and 1.0) in order to characterize their passive film and corrosion resistance at 37 °C under infectious simulated physiological conditions (Ringer´s solution acidulated with HCl) at pH = 3. The impedance spectra were obtained at different potential values between −0.7 and +0.7 V vs. SCE. Analysis of the impedance spectra was carried out by fitting different equivalent circuits to the experimental data. Two equivalent circuits, with one time constant and two time constants respectively, can be satisfactorily used for fitting the spectra: one time constant represents the characteristics of the compact passive film, and the second one is for the porous passive film. With the decreasing of Al content, the obtained EIS results are correlated with the evolution of the microhardness and microstructure, which is characterized by Optical Microscopy (OM), Scanning Electron Microscopy (SEM), and Energy-Dispersive X-Ray Spectroscopy (EDAX). It can be observed for all alloys that the resistance of the passive film is very high and decreases with the potential: the very high resistance of the passive film implies a high corrosion resistance, which can be assigned to the formation of the protective oxide layer and demonstrates that the analyzed alloys fulfill the prerequisites for their use as new materials for the manufacturing of medical instruments. Full article
(This article belongs to the Special Issue Corrosion without Limit: From Past to Future)
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