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Corrosion Behavior of Copper-Nickel Alloys Protected by BTA in Simulated Urban Atmosphere
Huang Songpeng1,2; Peng Can1,2; Cao Gongwang1,2; Wang Zhenyao1,2
Corresponding AuthorWang Zhenyao(zhywang@imr.ac.cn)
2021-03-11
Source PublicationACTA METALLURGICA SINICA
ISSN0412-1961
Volume57Issue:3Pages:317-326
AbstractCopper-nickel alloys are extensively used in precision instruments, ship building, building decorations, and currency manufacturing because of their excellent mechanical properties, good corrosion resistance, and silvery metallic luster. However, they are likely to suffer from discoloration owing to corrosion in the polluted atmosphere containing SO2, HSO3- and H+ exhibit ionization when SO2 is adsorbed and dissolved in the thin liquid film on the surface of white copper. These sulfide-containing media will accelerate the corrosion process and affect the surface gloss. Benzotriazole (C6H5N3, BTA) is a corrosion inhibitor commonly used in Cu and its alloys that forms a chemical conversion film. It mainly protects the copper-nickel alloys in solutions containing Cl or seawater polluted by sulfides. However, some studies have investigated the chemical conversion films of BTA that are affected by atmospheric pollution in the medium, especially focusing on analyzing their failure mode. This experiment was conceptualized based on the aforementioned problem. The corrosion behavior of the copper-nickel alloys protected by BTA in a simulated urban atmospheric environment was analyzed through SEM/EDS, XRD, and electrochemical tests. The laboratory experiments were accelerated by salt deposition. Results showed the presence of prismatic salt crystals on the surface of the copper-nickel alloy treated using BTA during the early stage of corrosion, indicating that the corrosion medium could not completely penetrate the substrate. The corrosion current density of the alloy protected by BTA will decrease first and then increase with the increasing corrosion time. This can be attributed to the oxidation and the presence of BTA chemical conversion films on the surface of the alloy; corrosion was delayed because of the combined action of these two factors. When the BTA film was damaged because of continuous consumption in the local area, the corrosion area expanded, increasing the corrosion current density. Be similar to the samples without BTA treatment, the final corrosion products of the samples treated with BTA were also loose and porous, and the main components were ZnSO4 center dot 6H(2)O and Cu-4(SO4)(OH)(6). However, the degree of corrosion of the alloy protected by BTA was more slight according to the cross-section morphology observation and mass dynamic curve analysis.
Keywordcopper-nickel alloy benzotriazole (BTA) atmospheric corrosion SO2
Funding OrganizationNational Natural Science Foundation of China
DOI10.11900/0412.1961.2020.00206
Indexed BySCI
Language英语
Funding ProjectNational Natural Science Foundation of China[51671197]
WOS Research AreaMetallurgy & Metallurgical Engineering
WOS SubjectMetallurgy & Metallurgical Engineering
WOS IDWOS:000618643300006
PublisherSCIENCE PRESS
Citation statistics
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/161052
Collection中国科学院金属研究所
Corresponding AuthorWang Zhenyao
Affiliation1.Univ Sci & Technol China, Sch Mat Sci & Engn, Shenyang 110016, Peoples R China
2.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China
Recommended Citation
GB/T 7714
Huang Songpeng,Peng Can,Cao Gongwang,et al. Corrosion Behavior of Copper-Nickel Alloys Protected by BTA in Simulated Urban Atmosphere[J]. ACTA METALLURGICA SINICA,2021,57(3):317-326.
APA Huang Songpeng,Peng Can,Cao Gongwang,&Wang Zhenyao.(2021).Corrosion Behavior of Copper-Nickel Alloys Protected by BTA in Simulated Urban Atmosphere.ACTA METALLURGICA SINICA,57(3),317-326.
MLA Huang Songpeng,et al."Corrosion Behavior of Copper-Nickel Alloys Protected by BTA in Simulated Urban Atmosphere".ACTA METALLURGICA SINICA 57.3(2021):317-326.
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