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首页> 外文期刊>Materials Chemistry and Physics >Evolution of corrosion products and metal release from Galvalume coatings on steel during short and long-term atmospheric exposures
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Evolution of corrosion products and metal release from Galvalume coatings on steel during short and long-term atmospheric exposures

机译：短期和长期暴露于钢中的Galvalume涂层中腐蚀产物和金属释放的演变

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摘要

Non-treated Galvalume (55% Al, 43.4% Zn and 1.6% Si by weight) coatings have been studied through a combination of surface, near surface and bulk analysis after exposure at marine conditions, and for comparison also in an urban test site and in successively more complex short-term laboratory exposures. Slightly polished Galvalume surfaces exhibit dendritic aluminum-rich areas with higher Volta potential compared with interdendritic zinc-rich areas. These effects were not observed on bare as-received surfaces due to the overall presence of aluminum oxide. As a result, preferential corrosion occurred initially in interdendritic areas. The zinc release rate followed the same time-dependence as the surface coverage of zinc-containing phases at the marine exposure condition with zinc predominantly released compared to aluminum. Short term laboratory exposures generated the same main phases as formed at marine conditions. This confirms that the evolution of corrosion products and time dependence of zinc release rates can be explained by the uniform formation of less soluble Al_2O_3, A100H and Al(OH)_3 compared to observed zinc-containing phases, e.g. ZnO, zinc hydroxycarbonate and zinc hydroxychloride. The same underlying mechanism is believed to operate also during exposure of Galvalume in the urban site studied.
机译：未经处理的Galvalume（55％的Al，43.4％的Zn和1.6％的Si（按重量计））涂层已通过在海洋条件下暴露后通过表面，近表面和体积分析的组合进行了研究，并且还用于城市测试场所和连续更复杂的短期实验室暴露。与树突间富锌区域相比，略微抛光的Galvalume表面呈现出树突富铝区域，具有较高的Volta电位。由于氧化铝的整体存在，在裸露的原样表面上未观察到这些影响。结果，首先在树突间区域发生优先腐蚀。锌的释放速率与海洋暴露条件下含锌相的表面覆盖率具有相同的时间依赖性，与铝相比，锌的释放率最高。短期实验室暴露产生的主要相与在海洋条件下形成的相相同。这证实了腐蚀产物的发展和锌释放速率的时间依赖性可以通过与观察到的含锌相（例如，Al 2 O 3），Al 2 O 3，AlO 3和Al（OH）3的均匀形成来解释。 ZnO，羟基碳酸锌和羟基氯化锌。据信，在所研究的城市场地中暴露于Galvalume的过程中，同样的潜在机制也起作用。

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  • 来源
    《Materials Chemistry and Physics》 |2012年第1期|419-428|共10页
  • 作者

    Ping Qiu; Christofer Leygraf; Inger Odnevall Wallinder;

  • 作者单位

    KTH Royal Institute of Technology, Division of Surface and Corrosion Science, Drottning Kristinas vaeg 51, SE-100 44 Stockholm, Sweden;

    KTH Royal Institute of Technology, Division of Surface and Corrosion Science, Drottning Kristinas vaeg 51, SE-100 44 Stockholm, Sweden;

    KTH Royal Institute of Technology, Division of Surface and Corrosion Science, Drottning Kristinas vaeg 51, SE-100 44 Stockholm, Sweden;

  • 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

    galvalume coating; atmospheric corrosion; runoff; corrosion product evolution;

    机译：镀锌涂料大气腐蚀;径流;腐蚀产物的演变;

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