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Corrosion Performance of Aluminum-containing Zinc Coatings

机译:含铝锌涂层的腐蚀性能

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摘要

Corrosion performance of zinc coatings containing aluminum in excess of 5% was assessed in modified salt-spray tests. X-ray diffraction studies indicated that the corrosion products consisted mainly of simonkolleite Zn_5(OH)_8Cl_2· H_2O, hydrozincite Zn_5(OH)_6(CO_3)_2, and zinc aluminum carbonate hydroxide hydrate Zn_6Al_2(OH)_(16)CO_3·4(H_2O). The content of Zn_6Al_2(OH)_(16)CO_3-4(H_2O) in the corrosion product increased as the aluminum content in the coatings increased. SEM-EDX analyses revealed that the microstructural features formed by the primary aluminum-rich α-phase frequently corroded first and at a faster pace than the zinc-rich β-phase in these coatings. The volume fraction and morphology of the zinc-rich β-phase existing in the coatings as degenerated eutectic are the two main factors which determine the corrosion resistance of Zn-Al coatings under development. The corrosion resistance of coatings peaked at about 12% Al in this study.
机译:在改良的盐雾试验中评估了含铝量超过5%的锌涂层的腐蚀性能。 X射线衍射研究表明,腐蚀产物主要由次氯酸锌Zn_5(OH)_8Cl_2·H_2O,水锌矿型Zn_5(OH)_6(CO_3)_2和碳酸锌铝氢氧化物水合物Zn_6Al_2(OH)_(16)CO_3·4组成。 (H_2O)。随着涂层中铝含量的增加,腐蚀产物中Zn_6Al_2(OH)_(16)CO_3-4(H_2O)的含量增加。 SEM-EDX分析表明,在这些涂层中,富含铝的主要α-相形成的微观结构特征通常比富含锌的β-相首先被腐蚀且腐蚀速度更快。涂层中以退化的共晶形式存在的富锌β相的体积分数和形态是决定正在开发的Zn-Al涂层耐腐蚀性的两个主要因素。在这项研究中,涂层的耐蚀性最高达到约12%Al。

著录项

  • 来源
    《ISIJ international》 |2010年第3期|p.455-462|共8页
  • 作者

    Nai-Yong TANG; Yihui LIU;

  • 作者单位

    Product Technology Centre, Teck Metals Ltd., 2380 Speakman Drive, Mississauga, Ontario, Canada;

    Product Technology Centre, Teck Metals Ltd., 2380 Speakman Drive, Mississauga, Ontario, Canada;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    corrosion; hot-dip galvanizing; microstructure; coating; zinc; aluminum;

    机译:腐蚀;热浸镀锌;微观结构涂层;锌铝;

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