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首页> 外文期刊>Journal of coatings technology and research >Characterization of a water-based paint for corrosion protection
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Characterization of a water-based paint for corrosion protection

机译：水性防腐涂料的表征

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摘要

Corrosion of steel rebars in reinforced concrete is one of the major problems in the construction industry. Carbonation reactions of concrete with carbon dioxide and, mainly, the chloride salts action are the main causes responsible for concrete degradation. Protective coatings help to improve the durability of concrete structures by acting as a physical barrier against the corrosion agents. Waterborne paints are usually used for concrete protection rather than solvent-based paints since they are less pollutant. The aim of this work is to investigate the influence of the pore size and porosity on the permeability of the paints films toward sodium chloride. Three characterization methods from membrane science were implemented to characterize paint coatings. The time-lag method was used to determine the permeability toward the sodium chloride and toward helium and argon, these for approximately 100% relative humidity. From the seven waterborne paints formulated, only one was found to be suitable for surface protection of reinforced concrete, since its permeability toward NaCl was smaller than 10~(14) m~2 s~(-1), the threshold value required by National Laboratory of Civil Engineering (LNEC) in Portugal. For the formulated paints, it was observed that the average pore size correlates well with the permeability toward sodium chloride. This is an important result since obtaining the permeability toward sodium chloride of corrosion protective paints is very time consuming, while the average pore size can be obtained in a much shorter time.
机译：钢筋混凝土中钢筋的腐蚀是建筑行业的主要问题之一。混凝土与二氧化碳的碳化反应，主要是氯盐的作用，是造成混凝土降解的主要原因。保护性涂层通过充当抗腐蚀剂的物理屏障，有助于提高混凝土结构的耐久性。水性涂​​料通常用于混凝土保护，而不是溶剂型涂料，因为它们的污染物较少。这项工作的目的是研究孔径和孔隙率对漆膜对氯化钠渗透性的影响。实施了膜科学的三种表征方法来表征涂料。使用时滞方法确定相对于大约100％相对湿度的氯化钠，氦气和氩气的渗透率。从七种水性涂料中，发现只有一种适用于钢筋混凝土的表面保护，因为其对NaCl的渗透性小于美国国家标准要求的阈值10〜（14）m〜2 s〜（-1）。葡萄牙土木工程实验室（LNEC）。对于配制的涂料，观察到平均孔径与对氯化钠的渗透性很好地相关。这是重要的结果，因为获得防腐蚀涂料对氯化钠的渗透性非常耗时，而平均孔径却可以在更短的时间内获得。

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  • 来源
    《Journal of coatings technology and research》 |2012年第3期|p.365-374|共10页
  • 作者

    Paula Dias; Catarina Carneiro; Luisa Andrade; Jose Sousa; Joao Machado; Adelio Mendes;

  • 作者单位

    LEPAE, Faculdade de Engenharia, Universidade do Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal;

    CIN, Corpora9ao Industrial do Norte, S. A., Avenida Dom Mendo 831, Apartado 1008, 4471-909 Maia, Portugal;

    LEPAE, Faculdade de Engenharia, Universidade do Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal;

    LEPAE, Faculdade de Engenharia, Universidade do Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal ,Departamento de Qufmica, Escola de Ciencias da Vida e do Ambiente, Universidade de Tras-os-Montes e Alto Douro, Apartado 1013, 5001-911 Vila-Real Codex, Portugal;

    CIN, Corpora9ao Industrial do Norte, S. A., Avenida Dom Mendo 831, Apartado 1008, 4471-909 Maia, Portugal;

    LEPAE, Faculdade de Engenharia, Universidade do Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal;

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  • 正文语种 eng
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  • 关键词

    concrete protection; water-based paints; chloride ion permeability; transport mechanism; time-lag method;

    机译：具体保护;水性涂​​料;氯离子渗透性运输机制;时滞法;

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