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Corrosion of Embedded Metals in Wood: An Overview of Recent Research with Implications for Building Moisture Design 木材中嵌入金属的腐蚀:近期研究综述及其对建筑防潮设计的影响
标准160《建筑物湿度控制设计分析标准》规定了建筑物的湿度设计标准,以防止真菌活动和腐蚀等湿气损害。虽然人们对木质建筑中的霉菌和腐烂真菌进行了大量研究,但人们往往忽略了潮湿的木材会腐蚀用来固定它的金属螺钉或钉子。目前,标准160中的腐蚀设计基于为大气腐蚀制定的相对湿度标准。然而,嵌入木材的金属的腐蚀是由木材化学和水分含量控制的,而不是由大气相对湿度控制的。本文重点介绍了最近关于木材中金属腐蚀的研究,这些研究可能会引起建筑防潮设计界人士的兴趣,他们制定了规范、标准和湿热模型,以尽量减少紧固件腐蚀引起的结构问题。 主要的设计含义是:(1)木材中金属的腐蚀与大气腐蚀不同,(2)木材含水量应保持在18%以下。引文:美国科学与技术研究院学报第119卷第2部分,科罗拉多州丹佛市。
Standard 160, Criteria for Moisture-Control Design Analysis in Buildings, specifies moisture design criteria in buildings to prevent moisture damage such as fungal activity and corrosion. While there has been much research on mold and decay fungi in wood buildings, it is often overlooked that wet wood is corrosive to the metal screws or nails used to fasten it. Currently, corrosion design in Standard 160 is based upon relative humidity criteria that were developed for atmospheric corrosion. However, the corrosion of metals embedded with wood is controlled by wood chemistry and moisture content rather than atmospheric relative humidity. This paper highlights recent research on the corrosion of metals in wood that may be of interest to those in the building moisture design community who develop codes, standards, and hygrothermal models to minimize the results of structure problems caused by fastener corrosion. The major design implications are that (1) corrosion of metals in wood is not the same as atmospheric corrosion, and (2) that the wood moisture content should be kept below 18%.
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