Recycle of magnesium alloy scrap for improving fire resistance, thermal stability, and water tolerance of intumescent fi
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Recycle of magnesium alloy scrap for improving fire resistance, thermal stability, and water tolerance of intumescent fire-retardant coatings Cheng Wang, Siqi Huo, Shi Liu, Qinghua Hu, Qi Zhang, Zhitian Liu
Ó American Coatings Association 2020 Abstract The rapid development and widespread application of magnesium alloy bring about a significant amount of magnesium alloy scrap. Thus, we offer a feasible and simple way to realize the recycling of magnesium scrap in this work, applying it as a synergist in the intumescent fire-retardant coatings for steel structure. With the introduction of magnesium scrap, the fire resistance, thermal stability, and water tolerance of the as-prepared coatings significantly improved. According to ASTM E119 standards, the fire resistance of coatings was investigated in our laboratory. Adding only 0.48 wt% of the scrap decreased the backside temperature of the coated steel from 310°C to 171°C, with a 44.8% reduction, indicating obvious synergy. Moreover, the coating containing 0.48 wt% scrap exhibited excellent thermal stability and water resistance, and its char yield at 800°C and water contact angle reached up to 27% and 80.6°, respectively. Based on the analysis of flame-retardant mechanism, the scrap and intumescent fire-retardant system jointly promoted the formation of an intumescent and compact char residue, thus suppressing the heat transfer and protecting the steel. Hence, using magnesium alloy scrap as a synergist contributed to realizing the recycling of waste and providing practical intumescent fire-retardant coatings for structural steel. Keywords Intumescent coatings, Magnesium alloy scrap, Fire resistance, Thermal stability, Water Cheng Wang and Siqi Huo equally contribute to this work and are listed as co-first authors. C. Wang, S. Huo, S. Liu, Q. Hu, Q. Zhang, Z. Liu (&) Institute of Materials for Optoelectronics and New Energy, School of Materials Science and Engineering, Wuhan Institute of Technology, Wuhan 430205, Hubei, People’s Republic of China e-mail: [email protected]
toleranceCheng Wang and Siqi Huo equally contribute to this work and are listed as co-first authors.
Introduction There are abundant magnesium resources in China, and the magnesium alloy is widely applied in the fields of aerospace, auto, telecommunication, home appliances, etc., due to its excellent intrinsic properties.1–3 With the widespread application of magnesium alloy, a large amount of magnesium alloy scrap is generated, and its disposal constitutes a serious environmental pollution. Thus, how to dispose of these scraps has aroused more and more attention in the industrial and scientific fields.4 With the emergence of more and more high-rise buildings, the high-rise building fire safety has become a very important topic in recent years.5–8 Generally, the structural steels are heavily applied in the high-rise buildings. Although steel is one class of incombustible matter, its strength and elastic coefficient will rapidly decrease in a fire and finally be lost near 600°C. Thus, i
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