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首页> 外文期刊>Applied Surface Science >Architectural optimization of an epoxy-based hybrid sol-gel coating for the corrosion protection of a cast Elektron21 magnesium alloy
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Architectural optimization of an epoxy-based hybrid sol-gel coating for the corrosion protection of a cast Elektron21 magnesium alloy

机译：用于铸造Elektron21镁合金防腐蚀的基于环氧的混合溶胶-凝胶涂料的体系结构优化

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摘要

An epoxy-based hybrid sol-gel coating was prepared in various architectural configurations has been studied for the corrosion protection of a cast Elektron21 magnesium alloy. The creation of a single layer of this coating presents defects consisting of macro-pores and protuberances, which opens access for corrosive species to reach the metallic substrate. These defects are suspected to result from the high reactivity of the substrate, as well as to the irregular topography of the substrate disrupted by the microstructure of the own magnesium alloy. Hence, a sol-gel coating in bilayer architecture is proposed, where the first layer would "inert" the surface of the magnesium substrate, and the second layer would cover the defects of the first layer and also thickening the coating. The morphological characteristics of the sol-gel coatings were analyzed by scanning electron microscopy (SEM), and their corrosion behavior was evaluated by OCP (open circuit potential) monitoring and electrochemical impedance spectroscopy (EIS) in chloride media. It is shown that both the architectural arrangement and the individual thickness of the first and second layers have an important influence on the anticorrosion performances of the protective system, just as much as its global thickness.
机译：研究了一种环氧结构的混合溶胶-凝胶涂料，该涂料以各种建筑结构制备，用于Elektron21铸造镁合金的腐蚀防护。形成该涂层的单层会出现由大孔和突起组成的缺陷，这为腐蚀性物质进入金属基材提供了便利。怀疑这些缺陷是由于基材的高反应性，以及由于自身镁合金的微观结构破坏了基材的不规则形貌造成的。因此，提出了双层结构的溶胶-凝胶涂层，其中第一层将“惰性化”镁基材的表面，而第二层将覆盖第一层的缺陷并使涂层增厚。通过扫描电子显微镜（SEM）分析了溶胶-凝胶涂层的形态特征，并通过OCP（开路电势）监测和电化学阻抗谱（EIS）在氯化物介质中评估了它们的腐蚀行为。结果表明，第一层和第二层的结构布置以及单独的厚度都对保护系统的防腐蚀性能产生了重要影响，正好与其总厚度一样大。

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  • 来源
    《Applied Surface Science》 |2014年第1期|62-73|共12页
  • 作者

    N.V. Murillo-Gutierrez; F. Ansart; J-P. Bonino; S.R. Kunst; C.F. Malfatti;

  • 作者单位

    Universite de Toulouse UPS-INP-CNRS, Institut Carnot CIRIMAT, Toulouse, France;

    Universite de Toulouse UPS-INP-CNRS, Institut Carnot CIRIMAT, Toulouse, France;

    Universite de Toulouse UPS-INP-CNRS, Institut Carnot CIRIMAT, Toulouse, France;

    Universidade Federal do Rio grande do Sul, Laboratory of Corrosion Research (LAPEC), Porto Alegre, Brazil;

    Universidade Federal do Rio grande do Sul, Laboratory of Corrosion Research (LAPEC), Porto Alegre, Brazil;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Magnesium; Corrosion; Sol-gel; Coating; Impedance; Elektron21;

    机译：镁;腐蚀;溶胶凝胶涂层;阻抗;电子21;

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