High-Temperature Corrosion and Oxidation of Metals and Alloys

A special issue of Coatings (ISSN 2079-6412). This special issue belongs to the section "Corrosion, Wear and Erosion".

Deadline for manuscript submissions: closed (31 July 2024) | Viewed by 2382

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Munir Rachid Corrosion Laboratory, Department of Materials Engineering, Federal University of São Carlos, Rodovia Washington Luís, São Carlos 13565-905, Brazil
Interests: electrochemical corrosion; high-temperature corrosion and oxidation; material engineering; material characterization; thermodynamics
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Special Issue Information

Dear Colleagues,

High-temperature corrosion and oxidation of metals and alloys are complex phenomena that occur when these materials are exposed to elevated temperatures (above 400 °C). Metals and their alloys exposed to ambient gases are often thermodynamically unstable and tend to react by forming scales, sulfides, carbides, nitrides, or a combination of corrosion products. The exact nature of the reaction products depends on the composition of the material and the environment in which it operates. Such corrosion reactions can lead to material degradation, including the loss of mechanical properties, thinning, and eventual failure. These deleterious effects have a significant impact on the performance and reliability of components and structures. Therefore, a comprehensive understanding of the underlying mechanisms and factors influencing high-temperature corrosion and oxidation is essential for the development of effective mitigation strategies and the selection of materials for high-temperature environments. This Special Issue invites the submission of original research papers, short communications and reviews focusing on corrosion mechanisms, kinetics, characterization of scales from both the structural and morphological perspectives, diffusion of the species involved in the processes, and other related topics. The scope includes metals and alloys exposed to elevated temperatures in various environments, including those containing oxygen, nitrogen, sulfur, carbon, and halogens. Studies on the use of coatings for corrosion and hot corrosion protection are highly encouraged.

Dr. Rodrigo da Silva
Guest Editor

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Keywords

  • high-temperature corrosion and oxidation
  • corrosion mechanism
  • oxidation kinetics
  • scale characterization
  • corrosion thermodynamic calculation
  • coatings for oxidation and corrosion protection
  • design of high temperature corrosion resistant alloys

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Published Papers (2 papers)

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Research

15 pages, 5469 KiB  
Article
High-Temperature Hot Corrosion Resistance of CrAl/NiCoCrAlY/AlSiY Gradient Composite Coating on TiAl Alloy
by Yuanyuan Sun, Qiang Miao, Shijie Sun, Wenping Liang, Zheng Ding, Jiangqi Niu, Feilong Jia, Jianyan Xu and Jiumei Gao
Coatings 2024, 14(8), 1067; https://doi.org/10.3390/coatings14081067 - 20 Aug 2024
Cited by 1 | Viewed by 886
Abstract
TiAl alloys are used in high-temperature components such as the turbine blades of aeroengines because of their excellent properties. However, TiAl alloys are prone to thermal corrosion when in near-ocean service. In order to solve this problem, a hot-corrosion-resistant CrAl/NiCoCrAlY/AlSiY gradient composite coating [...] Read more.
TiAl alloys are used in high-temperature components such as the turbine blades of aeroengines because of their excellent properties. However, TiAl alloys are prone to thermal corrosion when in near-ocean service. In order to solve this problem, a hot-corrosion-resistant CrAl/NiCoCrAlY/AlSiY gradient composite coating was prepared on the surface of the TiAl alloy. The phase composition and morphology of the coating were analyzed. Hot corrosion tests of the traditional NiCoCrAlY coating and CrAl/NiCoCrAlY/AlSiY gradient composite coating on a TiAl substrate were performed. The samples were coated with 75%Na2SO4 + 25%NaCl salt film and treated at 950 °C for 100 h, and the corrosion products were analyzed. The results indicate that compared with the TiAl substrate and traditional NiCoCrAlY-coated samples, the composite coating showed better hot corrosion resistance, only slightly cracking, and no corrosion loss occurred. This is mainly because the continuous Al2O3 layer can effectively resist the damage caused by the melting reaction in salt, and the Cr-rich layer can not only slow the mutual diffusion of elements but also generate a good corrosion resistance chromium oxide protective layer under serious corrosion. Moreover, the corrosion mechanism of the TiAl substrate, traditional NiCoCrAlY coating, and experimental composite coating was analyzed in detail. Full article
(This article belongs to the Special Issue High-Temperature Corrosion and Oxidation of Metals and Alloys)
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14 pages, 11328 KiB  
Article
High-Temperature Zn-5Al Hot Dip Galvanizing of Reinforcement Steel
by Anżelina Marek, Veronika Steinerová, Petr Pokorný, Henryk Kania and Franciszek Berger
Coatings 2024, 14(8), 959; https://doi.org/10.3390/coatings14080959 - 1 Aug 2024
Viewed by 1050
Abstract
This article presents the results of research on the growth kinetics, microstructure (SEM/EDS/XRD), and corrosion behavior of Zn-5Al coatings obtained using a high-temperature hot dip process on B500B reinforcing steel. The corrosion resistance of the coatings was determined using the neutral salt spray [...] Read more.
This article presents the results of research on the growth kinetics, microstructure (SEM/EDS/XRD), and corrosion behavior of Zn-5Al coatings obtained using a high-temperature hot dip process on B500B reinforcing steel. The corrosion resistance of the coatings was determined using the neutral salt spray (NSS) test (EN ISO 9227). Based on chemical composition tests in micro-areas (EDS) and phase composition tests (XRD), corrosion products formed on the coating surface after exposure to a corrosive environment containing chlorides were identified. In the outer layer of the coating, areas rich in Zn and Al were found, which were solid solutions of Al in Zn (α), while the diffusion layer was formed by a layer of Fe(Al,Zn)3 intermetallics. The growth kinetics of the coatings indicate the sequential growth of the diffusion layer, controlled by diffusion in the initial phase of growth, and the formation of a periodic layered structure with a longer immersion time. The NSS test showed an improved corrosion resistance of reinforcing bars with Zn-5Al coatings compared to a conventional hot-dip-galvanized zinc coating. The increase in corrosion resistance was caused by the formation of beneficial corrosion products: layered double hydroxides (LDH) based on Zn2+ and Al3+ cations and Cl anions and simonkolleite—Zn5(OH)8Cl2·H2O. Full article
(This article belongs to the Special Issue High-Temperature Corrosion and Oxidation of Metals and Alloys)
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