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Combining hygrothermal and corrosion models to predict corrosion of metal fasteners embedded in wood

机译：结合湿热和腐蚀模型来预测嵌入木材的金属紧固件的腐蚀

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摘要

A combined heat, moisture, and corrosion model is presented and used to simulate the corrosion of metal fasteners embedded in solid wood exposed to the exterior environment. First, the moisture content and temperature at the wood/fastener interface is determined at each time step. Then, the amount of corrosion is determined spatially using an empirical corrosion rate model and the inputs of the first step. The result is a corrosion profile along the length of the fastener generated by summing the corrosion depths determined at each time step. We apply the combined model to predict the annual corrosion depth along a metal fastener in wood decks situated in nine different US cities. Corrosion profiles are found to exhibit the same general shape independently of climatic load, with the largest amount of corrosion occurring at 1-5 mm from the wood surface with corrosion depths ranging from 5 urn in Phoenix, Arizona to 45 um in Hilo, Hawaii. Corrosion is confined to the first 7-20 mm of the fastener below the wood surface. By varying the climatic loads, we find that although there is a definite relation between total annual rain and total annual corrosion, under the same rain loads corrosion is higher for a climate with more evenly distributed rain events. The proposed combined model is able to capture corrosion behavior under varying loading. A sensitivity analysis gives guidelines for future corrosion modeling work for fasteners in wood. Published by Elsevier Ltd.
机译：提出了一个综合的热，湿气和腐蚀模型，该模型用于模拟嵌入在暴露于外部环境的实木中的金属紧固件的腐蚀。首先，在每个时间步骤确定木材/紧固件界面处的水分含量和温度。然后，使用经验腐蚀速率模型和第一步的输入在空间上确定腐蚀量。结果是沿着紧固件长度方向的腐蚀曲线，该腐蚀曲线是通过对每个时间步长确定的腐蚀深度求和而生成的。我们使用组合模型来预测位于美国9个不同城市的木质甲板上沿金属紧固件的年度腐蚀深度。腐蚀轮廓被发现表现出与气候负荷无关的相同总体形状，在距木材表面1-5 mm处腐蚀量最大，腐蚀深度范围从亚利桑那州凤凰城的5 um到夏威夷希洛的45 um。腐蚀限于紧固件在木材表面以下的前7-20毫米处。通过改变气候负荷，我们发现尽管年降水总量与年腐蚀总量之间存在确定的关系，但在相同的降雨负荷下，对于降雨事件分布更均匀的气候，腐蚀的程度更高。所提出的组合模型能够捕获变化载荷下的腐蚀行为。敏感性分析为木材紧固件未来的腐蚀建模工作提供了指导。由Elsevier Ltd.发布

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