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Conducting polymer/polyimide-clay nanocomposite coatings for corrosion protection of AA-2024 alloy.

机译：导电聚合物/聚酰亚胺-粘土纳米复合涂层，用于AA-2024合金的腐蚀防护。

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摘要

Corrosion of metals is a major problem in the aerospace and automobile industry. The current methods of corrosion protection such as chromate conversion coatings are under increased scrutiny from the Environmental Protection Agency (EPA) due to their carcinogenic nature. Intrinsically conducting polymers (ICPs) like polyaniline and polypyrrole have been considered as a potential replacement for chromate conversion coatings and have been under investigation since past decade.The goal of this study is to replace the chromate conversion coating by an environmentally friendly organic coating. Poly (N-ethyl aniline) coating was electrodeposited as the primer layer and polyimide-clay nanocomposite was solution cast as the barrier layer on AA-2024 alloy. This study will provide a better understanding of the corrosion protection mechanism of the conducting polymer coating. Various characterization techniques such as infrared spectroscopy, cyclic voltammetry and scanning electron microscopy were used to study the formation, chemical structure and morphology of the coatings. Electrodeposition parameters like monomer concentration, applied current density and the reaction time were varied in order to optimize the properties of the conducting polymer coating. The corrosion performance of the primer coating was evaluated by DC polarization studies. It was found that poly (N-ethyl aniline) reduces from emeraldine to leucoemeraldine form reducing the rate of cathodic reaction, which reduces the rate of corrosion of AA-2024 alloy.Polyimide-clay nanocomposite coating was solution cast on the conducting polymer primer layer for enhancing the barrier and corrosion properties of the coating system. The concentration of polyimide (10--25 vol%) and clay (0.1 and 1 wt%) were varied in the coating formulation to optimize the barrier properties of topcoat. X-ray diffraction showed that the intergallery clay distance decreased from 17.2 A to 11.79 A after immidization of polyimide-clay nanocomposite coating and infrared spectroscopy suggested that there was hydrogen bonding interaction between clay and polyimide chains. DC polarization study, electrochemical impedance spectroscopy and scanning vibrating electrode technique were used to evaluate the corrosion property and model the coating degradation in corrosive medium. It was found that the corrosion property were dependent on the thickness of the barrier coat and concentration of clay in the polyimide coating.The results obtained from the above mentioned test suggest that poly (N-ethyl aniline)/polyimide-clay nanocomposite coatings system is a potential candidate to replace the traditionally used and environmentally unfriendly chromate conversion coating.
机译：金属的腐蚀是航空航天和汽车工业中的主要问题。由于其致癌性，目前环境保护局（EPA）对诸如铬酸盐转化膜之类的腐蚀防护方法进行了越来越严格的审查。过去十年来一直在研究诸如聚苯胺和聚吡咯之类的本征导电聚合物（ICPs）作为铬酸盐转化膜的潜在替代品，这项研究的目标是用环保的有机涂料替代铬酸盐转化膜。在AA-2024合金上电沉积聚（N-乙基苯胺）涂层作为底漆层，并溶液浇铸聚酰亚胺-粘土纳米复合材料作为阻挡层。这项研究将更好地理解导电聚合物涂层的腐蚀防护机理。使用了各种表征技术，例如红外光谱，循环伏安法和扫描电子显微镜，研究了涂层的形成，化学结构和形态。改变电沉积参数，例如单体浓度，施加的电流密度和反应时间，以优化导电聚合物涂层的性能。通过直流极化研究评估了底漆涂层的腐蚀性能。研究发现，聚（N-乙基苯胺）从翡翠还原为亮绿翡翠，降低了阴极反应速率，降低了AA-2024合金的腐蚀速率。将聚酰亚胺-粘土纳米复合涂层溶液浇铸在导电聚合物底漆层上用于增强涂层系统的阻隔和腐蚀性能。在涂料配方中改变聚酰亚胺（10--25％（体积））和粘土（0.1％和1％（重量））的浓度，以优化面漆的阻隔性能。 X射线衍射表明，聚酰亚胺-粘土纳米复合涂层酰亚胺化后，层间粘土距离从17.2A降低到11.79A，红外光谱表明粘土与聚酰亚胺链之间存在氢键相互作用。使用直流极化研究，电化学阻抗谱和扫描振动电极技术评估腐蚀性能并模拟腐蚀介质中的涂层降解。发现腐蚀性能取决于阻隔涂层的厚度和聚酰亚胺涂层中粘土的浓度。上述测试结果表明，聚（N-乙基苯胺）/聚酰亚胺-粘土纳米复合涂层体系为有可能替代传统使用且对环境不友好的铬酸盐转化膜。

著录项

  • 作者

    Shah, Kunal G.;

  • 作者单位

    University of Cincinnati.;

  • 授予单位 University of Cincinnati.;
  • 学科 Engineering Materials Science.
  • 学位 Ph.D.
  • 年度 2004
  • 页码 148 p.
  • 总页数 148
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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