Experimental Studies of the Effects of Recoating on Fire Protection Properties of Old and New Layers of Intumescent Coatings for Steel Elements

IF 2.4 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Fire and Materials Pub Date : 2025-01-05 DOI:10.1002/fam.3271

L. L. Wang, X. Zhu, T. J. Liu

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Abstract

This paper presents the results of experimental studies investigating the effects of recoating on fire protection properties of composite layers of intumescent coatings for steel elements. Intumescent coatings, both with and without topcoats, were applied to steel plates. The samples were subjected to different cycles of hydrothermal aging before recoating. The composite layers of the existing and new coatings were then tested under fire. Comparisons of the morphological structures of the carbonaceous char revealed that the existing coating had little effect on the expansion properties of the new coating. However, the new coating reduced the expansion ratio of the existing coating. The thermal resistance of the existing coating decreased with the increasing thickness of the new coating. For specimens with a new coating 1.0 mm thick, the thermal resistance of the existing coating, after even moderate environmental exposure, was < 20% of the total and can be ignored. Contributions from the existing coating may be considered when specifying the thickness of the new coating if the new coating thickness is small and the existing coating is subjected to moderate environmental aging. Recoating with a different type of intumescent coating from the existing one appeared to provide better fire protection performance than using the same type.

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重涂对钢构件新、旧膨胀涂层防火性能影响的实验研究

本文介绍了再涂对钢构件膨胀涂层复合层防火性能影响的实验研究结果。膨胀涂层，包括面漆和无面漆，被应用于钢板。在涂层前对样品进行了不同循环的水热老化。然后在火下测试了现有涂层和新涂层的复合层。对炭质炭的形态结构进行比较，发现原有涂层对新涂层的膨胀性能影响不大。然而，新涂层降低了现有涂层的膨胀率。现有涂层的热阻随着新涂层厚度的增加而降低。对于新涂层厚度为1.0 mm的试件，即使在中等环境暴露后，现有涂层的热阻也占总热阻的20%，可以忽略不计。如果新涂层厚度小且现有涂层经受适度的环境老化，则在指定新涂层厚度时可考虑现有涂层的贡献。用一种不同类型的膨胀涂层重新涂覆现有涂层似乎比使用相同类型的涂层提供更好的防火性能。

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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来源期刊

Fire and Materials 工程技术-材料科学：综合

CiteScore

4.60

自引率

5.30%

发文量

审稿时长

3 months

期刊介绍： Fire and Materials is an international journal for scientific and technological communications directed at the fire properties of materials and the products into which they are made. This covers all aspects of the polymer field and the end uses where polymers find application; the important developments in the fields of natural products - wood and cellulosics; non-polymeric materials - metals and ceramics; as well as the chemistry and industrial applications of fire retardant chemicals. Contributions will be particularly welcomed on heat release; properties of combustion products - smoke opacity, toxicity and corrosivity; modelling and testing.