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首页> 外文会议>NACE International annual conference exposition;Corrosion 2000 >Precipitation Runoff and Atmospheric Corrosion
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Precipitation Runoff and Atmospheric Corrosion

机译：降水径流和大气腐蚀

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This report presents the results for precipitation runoff studies from boldly exposed zinc surfacesrnat three sites having substantially different environments: Washington DC, Newport OR, and AlbanyrnOR. The relationship between atmospheric corrosion and precipitation runoff chemistries werernexamined for experiments of up to 33 months duration by the use of geochemical modeling with arnsoftware package available from the U.S. Geological Survey. Total precipitation runoff rates for thernthree sites were determined, as well as contributions from strong acids, weak acids and dry deposition tornthe total rate. Cumulative zinc runoff losses were linear with respect to both time and precipitationrnvolume, which produce effective models for long-term corrosion mass loss based on runoff loss rates.rnPrecipitation runoff rates for Washington DC, Newport OR, and Albany OR were found to be 0.90,rn0.69, and 0.49 :m Zn/y respectively. Contributions to the total precipitation runoff rate from dryrndeposition (0.26 :m Zn/y), strong acids (0.24 :m Zn/y), and weak acids (0.40 :m Zn/y) reactions werernfound for the Washington DC site. These values correspond to dry deposition calculations from particlernand molecular transport data in the atmosphere. Precipitation runoff rates for Newport OR and AlbanyrnOR were found to be due solely to weak acid reactions.
机译：本报告介绍了在三个环境显着不同的地点（大胆暴露的锌表面）进行的降雨径流研究的结果：华盛顿特区，纽波特或奥尔巴尼。通过使用地球化学模型和可从美国地质调查局获得的arnsoftware软件包，对大气腐蚀与降水径流化学之间的关系进行了长达33个月的实验。确定了这三个地点的总降雨径流率，以及强酸，弱酸和干沉降对总速率的贡献。累积的锌径流损失与时间和降水量呈线性关系，从而基于径流损失率建立了长期腐蚀质量损失的有效模型。华盛顿特区，纽波特或奥尔巴尼的降水径流率为0.90，分别为rn0.69和0.49：m Zn / y。在华盛顿特区，发现了干沉降（0.26：m Zn / y），强酸（0.24：m Zn / y）和弱酸（0.40：m Zn / y）反应对总降水径流速率的贡献。这些值对应于大气中颗粒和分子传输数据的干沉降计算。发现纽波特OR和AlbanyrnOR的降雨径流率完全是由于弱酸反应引起的。

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