A Hot Box–Cold Box Investigation of the Corrosion Behavior of Highly Insulated Zinc Roofing Systems

R. Zheng, J. Carmeliet, H. Hens, A. Janssens, W. Bogaerts
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引用次数: 3

Abstract

This paper investigates the effect of roofing systems on the humidityinduced corrosion of zinc sheeting in highly insulated zinc roofs. Ten types of roofing systems (U< 0.25 W/(m2K)) were tested in a hot box–cold box apparatus. The measurements and investigations include the relative humidity under the zinc sheeting, the corrosion type, the corrosion product, and the corrosion rate. The influence of a well performing air-vapor retarder below the insulation on the underside corrosion of zinc sheeting is slight for zinc roofs with a good cavity ventilation, but significant if the ventilation is poor. For nonventilated zinc roofs, installing a perfect air-vapor retarder under the insulation only is not sufficient to control the sheeting underside corrosion. Further introducing a dry capillary and sorption active material between the sheeting and the insulation greatly reduces that corrosion.
高绝热锌屋面系统腐蚀行为的热-冷-箱研究
本文研究了屋面系统对高绝热锌屋面锌片湿腐蚀的影响。10种屋面系统(U< 0.25 W/(m2K))在热箱-冷箱装置中进行了测试。测量和研究包括锌片下的相对湿度、腐蚀类型、腐蚀产物和腐蚀速率。在保温层下方安装性能良好的空气-蒸汽缓速器对锌板下壁腐蚀的影响,对于空腔通风良好的锌屋顶影响不大,但对于通风不良的锌屋顶影响很大。对于不通风的锌屋顶,仅仅在隔热层下安装一个完美的空气-蒸汽缓速器是不足以控制板下面的腐蚀的。进一步引入干毛细管和吸附活性材料之间的板材和绝缘大大减少了腐蚀。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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