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Electrochemical Preparation and Corrosion Resistance of PEDOT Coatings on Surface of 2024 Aluminum Alloy
Gao Bowen1,2; Wang Meihan1; Yan Maocheng2; Zhao Hongtao2; Wei Yinghua2; Lei Hao2
Corresponding AuthorWang Meihan(wangmhdicp@aliyun.com) ; Yan Maocheng(yanmc@imr.ac.cn)
2020-11-11
Source PublicationACTA METALLURGICA SINICA
ISSN0412-1961
Volume56Issue:11Pages:1541-1550
AbstractPoly (3,4-ethylenedioxythiophene) (PEDOT) is one of the most promising anticorrosive materials due to its outstanding conductivity, stability, and environmental compatibility. From the standpoint of corrosion protection of aluminum alloys, PEDOT coatings are a good substitute for the traditional toxic chromium-based coatings. Electrochemical deposition, as a convenient and clean synthesis approach, has been widely employed for direct preparation of PEDOT coatings. Herein, cyclic voltammetry and constant-current method were used to electrodeposit PEDOT coatings on 2024 aluminum alloy substrates. The effects of polymerizing 3,4-ethylenedioxythiophene (EDOT) in three electrolyte solutions (lithium perchlorate (LiClO4) and sodium dodecyl sulfate (SDS), sodium hydrogen phthalate (C8H5NaO4) and SDS, and tetrabutylammonium hexafluorophosphate (TBAPF(6)) acetonitrile) on the growth and morphology of the PEDOT coatings were investigated. The interactions between the coating and the aluminum substrate were studied through galvanic corrosion, electrochemical impedance spectra (EIS), and scanning vibration electrode technology (SVET). The results show that TBAPF, exhibited passivation and corrosion-inhibition effects on the substrate and significantly reduced the oxidation potential of EDOT. The surface morphology of the coating prepared via constant-current method showed complete and dense agglomerated spherical particles. The PEDOT coating formed a passivation layer on the substrate, and thus protected it from the corrosive medium. The maximum resistance was achieved in DHS solution (3.5 g/L (NH4)(2)SO2+0.5 g/L NaCl) after 3 d. The scratched PEDOT coating could promote surface charge delocalization and avoid charge concentration, resulting in electrochemical protection of the aluminum alloy.
KeywordPEDOT coating 2024 aluminum alloy electrodeposition EIS SVET
Funding OrganizationNational Natural Science Foundation of China ; National Basic Research Program of China ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Program for Innovation Talents in Univerisity of Liaoning Province
DOI10.11900/0412.1961.2020.00089
Indexed BySCI
Language英语
Funding ProjectNational Natural Science Foundation of China[52071320] ; National Basic Research Program of China[2014CB643304] ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Program for Innovation Talents in Univerisity of Liaoning Province
WOS Research AreaMetallurgy & Metallurgical Engineering
WOS SubjectMetallurgy & Metallurgical Engineering
WOS IDWOS:000584345200010
PublisherSCIENCE PRESS
Citation statistics
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/141458
Collection中国科学院金属研究所
Corresponding AuthorWang Meihan; Yan Maocheng
Affiliation1.Shenyang Univ, Sch Mech Engn, Shenyang 110044, Peoples R China
2.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China
Recommended Citation
GB/T 7714
Gao Bowen,Wang Meihan,Yan Maocheng,et al. Electrochemical Preparation and Corrosion Resistance of PEDOT Coatings on Surface of 2024 Aluminum Alloy[J]. ACTA METALLURGICA SINICA,2020,56(11):1541-1550.
APA Gao Bowen,Wang Meihan,Yan Maocheng,Zhao Hongtao,Wei Yinghua,&Lei Hao.(2020).Electrochemical Preparation and Corrosion Resistance of PEDOT Coatings on Surface of 2024 Aluminum Alloy.ACTA METALLURGICA SINICA,56(11),1541-1550.
MLA Gao Bowen,et al."Electrochemical Preparation and Corrosion Resistance of PEDOT Coatings on Surface of 2024 Aluminum Alloy".ACTA METALLURGICA SINICA 56.11(2020):1541-1550.
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