2024铝合金表面PEDOT涂层的电化学制备及耐腐蚀性能
Electrochemical Preparation and Corrosion Resistance of PEDOT Coatings on Surface of 2024 Aluminum Alloy
查看参考文献31篇
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文摘
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分别采用循环伏安法和恒电流法在2024铝合金基底上电沉积聚3,4-乙烯二氧噻吩(PEDOT)涂层,考察在3种电解质溶液(高氯酸锂(LiClO4)和十二烷基硫酸钠(SDS)水溶液,邻苯二甲酸氢钠(C8H5NaO4)和SDS水溶液,六氟磷酸四丁铵(TBAPF6)乙腈溶液)中聚合3,4-乙烯二氧噻吩(EDOT)对PEDOT涂层生长和形貌的影响。通过电偶腐蚀、电化学阻抗谱(EIS)和扫描振动电极技术(SVET)研究PEDOT涂层与铝合金基底之间的相互作用。结果表明,TBAPF6不仅对基底具有钝化和缓蚀作用,而且能够显著降低EDOT的氧化电位。恒电流法制备的涂层表面呈球状团聚且完整致密。电偶腐蚀和EIS结果表明,PEDOT涂层阻隔了腐蚀介质并使基底钝化,其阻值在DHS溶液(3.5 g/L (NH_4)_2SO_2+0.5 g/L NaCl)中浸泡3 d后达到最大。SVET结果表明,破损的PEDOT涂层能够促进表面电荷离域,避免电荷集中,产生电化学保护效应。 |
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其他语种文摘
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Poly (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 (TBAPF6) 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 TBAPF6 exhibited passivation and corrosioninhibition 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 (NH_4)_2SO_2+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. |
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来源
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金属学报
,2020,56(11):1541-1550 【核心库】
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DOI
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10.11900/0412.1961.2020.00089
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关键词
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PEDOT涂层
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2024铝合金
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电沉积
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EIS
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SVET
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地址
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1.
沈阳大学机械工程学院, 沈阳, 110044
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中国科学院金属研究所, 沈阳, 110016
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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0412-1961 |
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学科
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金属学与金属工艺 |
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基金
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国家自然科学基金
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国家973计划
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中国科学院A类战略性先导科技专项项目
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辽宁省高等学校创新人才支持计划项目
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文献收藏号
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CSCD:6838131
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