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首页> 外文期刊>Corrosion Engineering, Science and Technology >Degradation of galvanised iron roofing material in Tanzania by atmospheric corrosion
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Degradation of galvanised iron roofing material in Tanzania by atmospheric corrosion

机译：大气腐蚀使坦桑尼亚的镀锌铁屋顶材料降解

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摘要

Galvanised iron is popular in many applications, particular as a roofing material. However, just like other materials, especially metallic ones, it is prone to degradation by corrosion. In this particular study, the degradation of galvanised roof sheets was investigated at a coastal, urban and rural site in Tanzania, Africa. Samples were exposed to various outdoor environments over a period of 3 years. In addition, some accelerated laboratory investigations were conducted in different simulated air pollution environments in an artificial corrosion chamber constructed for this purpose to supplement the outdoor exposure tests. It was found that the combination of the tropical climate and increasing air pollution due to industrial development in the capital Dares-Salaam resulted in substantial atmospheric corrosion of the roof sheets, which eventually leads to failure and the necessity for replacement. The rural site had the lowest degree of atmospheric corrosion as expected. A combination of different corrosion products was identified as a result of the atmospheric corrosion by Raman and EDX analyses. The information gained from this investigation could be utilised to construct more durable structures requiring less frequent replacement and maintenance in future.
机译：镀锌铁在许多应用中都很流行，特别是作为屋顶材料。但是，就像其他材料（尤其是金属材料）一样，它易于被腐蚀降解。在这项特殊的研究中，在非洲坦桑尼亚的沿海，城市和农村地区研究了镀锌屋顶板的退化情况。样品在3年内暴露于各种室外环境。此外，在人工腐蚀室中，在不同的模拟空气污染环境中进行了一些加速的实验室研究，为此目的而建造的人工腐蚀室是对室外暴露测试的补充。人们发现，由于首都达累斯萨拉姆的工业发展，热带气候和空气污染的加剧共同导致了屋顶的大气腐蚀，最终导致了故障和更换的必要性。如预期的那样，农村地区的大气腐蚀程度最低。拉曼和EDX分析表明，大气腐蚀是多种腐蚀产物的组合。从这项调查中获得的信息可用于构建更耐用的结构，从而在将来需要较少的更换和维护。

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