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16 pages, 4725 KiB

Open AccessArticle

The Corrosion Behavior of Different Silver Plating Layers as Electrical Contact Materials in Sulfur-Containing Environments

by Bingkun Yang, Yun Chen, Wenkui Hao, Yu Han, Qiang Zhang, Yujie Li, Xiaofang Wang, Luyao Huang and Yiliang Lu

Coatings 2023, 13(10), 1796; https://0-doi-org.brum.beds.ac.uk/10.3390/coatings13101796 - 20 Oct 2023

Cited by 2 | Viewed by 1633

Abstract

Isolation switching devices are vital components in power grids. During their operational lifespan, these devices are prone to corrosion failure in atmospheric environments. To enhance conductivity and corrosion resistance, silver plating is applied to the contact surface of high-voltage switches. Common methods include [...] Read more.

Isolation switching devices are vital components in power grids. During their operational lifespan, these devices are prone to corrosion failure in atmospheric environments. To enhance conductivity and corrosion resistance, silver plating is applied to the contact surface of high-voltage switches. Common methods include graphite-Ag (G-Ag) coating, graphene-Ag (Gr-Ag) coating, and Ag-Sn coating. In this article, the corrosion resistance performance of silver plating, G-Ag coating, Gr-Ag coating, and Ag-Sn coating was studied. Firstly, adhesion tests were conducted on the plating layers. Subsequently, immersion experiments were performed to evaluate the corrosion resistance of the samples. Scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), and laser confocal microscopy were used to analyze the morphology and elemental composition of the samples. Raman spectroscopy was used to analyze corrosion products. An electrochemical workstation was employed to study the electrochemical behavior of the samples. The adhesion results indicate that the adhesion of the plating layers is excellent. The immersion and electrochemical results showed the corrosion resistance order of the four Ag coatings was Ag-Sn coating > Gr-Ag coating > Ag coating > G-Ag coating. Full article

(This article belongs to the Special Issue Microstructure and Corrosion Behavior of Metallic Materials)

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Review

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24 pages, 4524 KiB

Open AccessEditor’s ChoiceReview

Progress in Marine Antifouling Coatings: Current Status and Prospects

by Liang Li, Heting Hong, Jingyi Cao and Yange Yang

Coatings 2023, 13(11), 1893; https://0-doi-org.brum.beds.ac.uk/10.3390/coatings13111893 - 03 Nov 2023

Viewed by 2202

Abstract

The shipping industry is vital to global trade. Unfortunately, this industry is negatively impacted on a large scale by biofouling, a process whereby unwanted organisms accumulate on submerged surfaces, massively affecting traveling speed and fuel consumption. Fortunately, antifouling coatings have been developed to [...] Read more.

The shipping industry is vital to global trade. Unfortunately, this industry is negatively impacted on a large scale by biofouling, a process whereby unwanted organisms accumulate on submerged surfaces, massively affecting traveling speed and fuel consumption. Fortunately, antifouling coatings have been developed to combat this problem. This review summarizes the process of biofouling and briefly discusses the history of antifouling coating development. Moreover, eight major antifouling coatings are reviewed, including bionic microstructure, self-polishing, fouling and desorption, zwitterionic polymer, self-assembled thin-layer, liquid-smooth surface, conductive, and photocatalytic antifouling coatings. The technical principles, innovation, and advancement of each coating are expounded, and the relevant research progress is discussed. Finally, the remaining issues and challenges in antifouling coatings are discussed, along with their prospects. Full article

(This article belongs to the Special Issue Microstructure and Corrosion Behavior of Metallic Materials)

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15 pages, 2027 KiB

Open AccessReview

Stress Corrosion Cracking of Copper–Nickel Alloys: A Review

by Dandan Li, Kaiyang Li, Jiajie Gao, Yunfeng Liu, Chao Qin, Jianfeng Li, Yongshuai Li, Wei Cao, Yunlong Zhai and Guojie Huang

Coatings 2023, 13(10), 1690; https://0-doi-org.brum.beds.ac.uk/10.3390/coatings13101690 - 26 Sep 2023

Viewed by 1298

Abstract

Under the combination of certain corrosive ions and stress, Cu-Ni alloys may experience severe stress corrosion cracking (SCC), which causes premature failure and hinders their further applications as crucial construction materials in various engineering fields. To reveal the origin of such failure, minimize [...] Read more.

Under the combination of certain corrosive ions and stress, Cu-Ni alloys may experience severe stress corrosion cracking (SCC), which causes premature failure and hinders their further applications as crucial construction materials in various engineering fields. To reveal the origin of such failure, minimize the related negative impacts, and achieve economic and social benefits, this review summarizes all SCC-related issues by making a brief introduction to Cu-Ni alloys, reporting the SCC behavior in various environments, identifying the effects of different factors during SCC, and revealing the SCC degradation mechanisms. S²⁻ and NH₄⁺ are the prominent SCC initiators since the former can combine with Cu⁺ to form Cu₂S as a non-protective corrosion product, while the latter has a great tendency to react with Cu₂O/Cu and accelerate the general or local dissolution. Their combination has the most detrimental effect. The SCC mechanisms of Cu-Ni alloys are summarized as film rupture theory and dealloying theory. The related SCC mitigation strategies, including using inhibitors, tailoring alloying elements, and removing/reducing the stress are also discussed. In addition, future directions are made at the end of this paper. Full article

(This article belongs to the Special Issue Microstructure and Corrosion Behavior of Metallic Materials)

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