Atmospheric corrosion resistance of structural steels
Atmospheric corrosion resistance of structural steels
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DOI：
10.1061/(asce)0899-1561(2003)15:1(2
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发表时间：
2003-01-01
影响因子：
3.2
通讯作者：
Hall, TT
中科院分区：
文献类型：
--
作者：
Albrecht, P;Hall, TT
本文的主要目的是为工程师提供有关腐蚀引起的结构钢构件厚度损失的数据。为此，作者从许多研究报告和期刊论文中收集了大气暴露数据。这些数据以厚度损失与暴露的曲线图呈现，该曲线图展示了环境和钢材类型的影响。环境包括农村、工业和海洋，按顺序变得越来越严重。所考虑的钢是A242、A588、铜和碳钢，它们的耐腐蚀性依次降低。将数据与耐候钢和碳钢的中等腐蚀性带进行比较，有助于确定环境的严重程度和钢成分的耐腐蚀性。对于裸露的结构，应将腐蚀裕量添加到通过应力计算得出的所有构件厚度中，可通过外推适用的厚度损失曲线到结构使用寿命结束来估计。从简单试样（大多为索引卡的150 X 100 mm尺寸）获得的腐蚀裕量厚度损失数据必须小心地应用于复杂结构，例如桥梁，其具有不同暴露条件下的各种细节。当裸露、暴露的结构部分长时间保持潮湿或湿润时，厚度损失可能比暴露在30度朝南的测试样本报告的厚度损失高得多。良好的结构细节，防止水分积累是至关重要的。
The main objective of this paper is to provide engineers with data on thickness loss of structural steel members resulting from corrosion. To this end, the writers have collected atmospheric exposure data from many research reports and journal papers. The data are presented in graphs of thickness loss versus exposure that demonstrate the effects of types of environment and steel. The environments include rural, industrial, and marine, becoming increasingly severe in that order. The steels under consideration are A242, A588, copper, and carbon steels, with their corrosion resistance decreasing in that order. Comparisons of the data with the medium corrosivity bands for weathering and carbon steels help to determine the severity of environments and the corrosion resistance of steel compositions. For bare exposed structures, a corrosion allowance should be added to all member thicknesses arrived at by stress calculations can be estimated by extrapolating an applicable thickness loss curve to the end of the service life of the structure. The corrosion allowance thickness loss data obtained from simple test specimens, mostly of the 150 X 100 mm size of an index card, must be applied carefully to complex structures such as a bridge, which has a variety of details with different exposure conditions. When portions of a bare, exposed structure remain damp or wet for long periods of time, thickness losses can be much higher than those reported for test specimens exposed at 30degrees facing south. Good structural detailing that prevents moisture accumulation is of utmost importance.