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Metals
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Corrosion and Protection of Metallic Materials in Extreme Environments
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Corrosion and Protection of Metallic Materials in Extreme Environments

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 2020) | Viewed by 6639

Special Issue Editor

Prof. Sonia Mato

E-Mail Website
Guest Editor
Chemistry and Materials Engineering Department, Faculty of Chemistry, Complutense University of Madrid, Avda. Complutense s/n, Ciudad Universitaria, Madrid 28040, Spain
Interests: electrochemical corrosion; oxidation at high temperature; protective coatings; hard metal composites; thermodynamic simulations

Special Issue Information

Dear Colleagues,

One of the main drawbacks to the use of metallic materials is the degradation and deterioration of their properties by the action of the surrounding environment due to electrochemical corrosion. The environment may be a liquid, gas, or molten salt. As new applications appear in the main industrial fields involving harsh media, the minimum requirements demanded of traditional alloys have increased. It is for this reason that the development of new materials has become a fruitful object of research in materials science and technology. In order to achieve this goal, a careful characterization and understanding of the complex processes of corrosion on the surface of the new candidate materials are needed.

Moreover, in the attempt to overcome the corrosion problems linked to extreme environments, apart from the straightforward approach of using bulk alloys with improved corrosion resistance, the application of a protective coating to the metallic substrate is another effective technique.

Therefore, this Special Issue of Metals will be devoted to illustrating the state-of-the-art in the study of electrochemical behavior and corrosion resistance of alloys of industrial interest. We also encourage authors reporting new breakthroughs in the field of protective coatings to participate.

Prof. Sonia Mato
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

  • Electrochemical behavior
  • Corrosion resistance
  • Passivation
  • Protective coatings
  • Metals

Published Papers (3 papers)

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Research

22 pages, 5273 KiB  
Article
Study of Hillock and Zinc Whisker Evolution in Five Different Cable Tray Coatings
by Borja Arroyo, Marion Roth, José Alberto Álvarez, Ana Isabel Cimentada, Sergio Cicero, Jaime Seco and Guillermo Becedoniz
Metals 2021, 11(2), 325; https://doi.org/10.3390/met11020325 - 13 Feb 2021
Viewed by 2221
Abstract
The main objective of this work is the study of the hillock and zinc whisker evolution of five different commercial zinc coatings applied on the same base steel wires of the patented EASYCONNECT system cable trays manufactured by VALDINOX Ltd.: white zinc alkaline [...] Read more.
The main objective of this work is the study of the hillock and zinc whisker evolution of five different commercial zinc coatings applied on the same base steel wires of the patented EASYCONNECT system cable trays manufactured by VALDINOX Ltd.: white zinc alkaline electrolyte, yellow zinc trivalent electrolyte, acid zinc electrolyte, hot dip galvanized, and zinc nickel coating. The limited literature on the subject is summarized, and then the coating thickness, chemical composition, hardness and surface rugosity are characterized. The hillock and whisker density evolution are evaluated over a period of 12 months, considering the presence of compression bending stresses. It is concluded that the white alkaline and yellow trivalent coatings are the most affected, while the zinc-nickel shows the best behavior with no presence of whiskers; the acid zinc electrolyte also shows good results despite the delayed appearance of whiskers from the ninth month; the hot-dip galvanized coating does not show any presence of zinc whiskers or hillocks. Full article
(This article belongs to the Special Issue Corrosion and Protection of Metallic Materials in Extreme Environments)
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13 pages, 3446 KiB  
Article
The Influence of Aluminum Content on Oxidation Resistance of New-Generation ODS Alloy at 1200 °C
by Luděk Stratil, Vít Horník, Petr Dymáček, Pavla Roupcová and Jiří Svoboda
Metals 2020, 10(11), 1478; https://doi.org/10.3390/met10111478 - 06 Nov 2020
Cited by 15 | Viewed by 2285
Abstract
The aim of the paper is to evaluate the effect of aluminum content on the oxidation resistance of new-generation of oxide dispersion strengthened (ODS) alloy at 1200 °C. Three grades of the alloy of chemical composition Fe-15Cr-xAl-4Y2O3 with [...] Read more.
The aim of the paper is to evaluate the effect of aluminum content on the oxidation resistance of new-generation of oxide dispersion strengthened (ODS) alloy at 1200 °C. Three grades of the alloy of chemical composition Fe-15Cr-xAl-4Y2O3 with different Al contents x = 0.3 wt.%, 2.0 wt.% and 5.5 wt.% are prepared by mechanical alloying. The alloys are consolidated by high temperature rolling followed by heat treatment. To study the oxidation resistance the samples are isothermally aged in the air for 1 h, 4 h, 16 h and 64 h at 1200 °C. The oxidation kinetics, composition and formation mechanism of the oxide layers are analyzed. The weight gain of prepared steels is estimated. The kinetics of oxidation is studied on metallographic cross-sections of the exposed samples by scanning electron microscopy (SEM) and energy dispersive spectrometer (EDS) analysis. The oxides on the surfaces are identified by X‑ray diffraction (XRD) analysis. The Al content significantly enhances the oxidation resistance of the alloy. For a sufficiently high Al content in the alloy a compact oxide layer of α‑Al2O3 on the surface is formed, which significantly suppresses further oxidation process. Full article
(This article belongs to the Special Issue Corrosion and Protection of Metallic Materials in Extreme Environments)
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12 pages, 9546 KiB  
Article
Initial Corrosion Behavior of 12Cr1MoV Steel in Thiosulfate-Containing Sodium Aluminate Solution
by Jingjiu Yuan, Chaoyi Chen, Junqi Li, Bianli Quan, Yuanpei Lan, Linzhu Wang, Hui Fu and Jiaxuan Gai
Metals 2020, 10(10), 1283; https://doi.org/10.3390/met10101283 - 25 Sep 2020
Cited by 9 | Viewed by 1644
Abstract
When alumina is produced by the Bayer process with high-sulfur bauxite, the sulfur would strongly corrode the 12Cr1MoV steel made heat exchanger. This study investigated the initial corrosion behavior of the 12Cr1MoV steel exposed to a thiosulfate-containing sodium aluminate (TCSA) solution under the [...] Read more.
When alumina is produced by the Bayer process with high-sulfur bauxite, the sulfur would strongly corrode the 12Cr1MoV steel made heat exchanger. This study investigated the initial corrosion behavior of the 12Cr1MoV steel exposed to a thiosulfate-containing sodium aluminate (TCSA) solution under the evaporation conditions of alumina production. The obtained corrosion rate equation is V = 6.306·t·exp(−0.71). As corrosion progressed, with the corrosion product film growing, the corrosion current density declines slowly, and the corrosion resistance of the steel is increased. At 1–3 days, the corrosion product film consisted of FeO, Fe2O3, and FeOOH. S2O32− lead to corrosion in local areas of the steel and pits appeared. AlO2− is transformed into Al(OH)3 and filled in the corrosion pits. At 4 and 5 days, Fe3O4 is generated in the outermost layer, and Al(OH)3 is shed from the corrosion pits. The corrosion mechanism of 12Cr1MoV steel in a TCSA solution is proposed based on the experimental results. Full article
(This article belongs to the Special Issue Corrosion and Protection of Metallic Materials in Extreme Environments)
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