Flame Retardant and Anticorrosion Behavior of Multifunctional Epoxy Nanocomposite Coatings Containing Graphitic Carbon Nitride/Silanized HfO2 Nanofillers for the Protection of Steel Surface in Automobile Industry

Joseph Raj Xavier*, Vinodhini S P, Ramesh B and Raja Beryl J, 
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Abstract

With the help of (3-trimethoxysilylpropyl) diethylenetriamine (TMSPETA), hafnium(IV) oxide (HfO2), an inorganic nanofiller, was modified. The resulting TMSPETA/HfO2 was then encased in graphitic carbon nitride (GCN) and placed within a pure epoxy resin (EP). The protective behavior of mild steel coated with epoxy in the presence of various concentrations of GCN/TMSPETA-HfO2 was studied using electrochemical methods in seawater environment. It was found that the addition of 0.6 wt % of GCN/TMSPETA-HfO2 to the epoxy resin produced maximum resistance. Hence, the optimum concentration of 0.6 wt % was utilized for further investigation. The PHRR and THR values for the GCN/TMSPETA-HfO2 significantly decreased by 73% and 57%, respectively, as compared to pure EP, showing that the material is more flame retardant. The results of salt spray tests showed that the inclusion of GCN/TMSPETA-HfO2 in the epoxy matrix enhanced the corrosion protection performance and reduced water absorption. EIS measurements showed that the epoxy-GCN/TMSPETA-HfO2 had increased coating resistance of 6.42E9 Ω·cm2 even after 320 h of exposure to seawater. According to SECM investigations, the coated steel with EP-GCN/TMSPETA-HfO2 nanocomposite has the lowest ferrous ion dissipation (1.0 I/nA). FE-SEM/EDX investigation revealed that silanized GCN was enhanced in the degradation products, resulting in a durable inert nanolayered covering. The newly created EP-GCN/TMSPETA-HfO2 coating was incredibly water-resistant, with a WCA of 165°. The TMSPETA-HfO2 wrapped in GCN has demonstrated strong adhesion and hardness in the epoxy substrate as well as good mechanical properties. An increased adhesive strength (19.1 MPa) was achieved for mild steel coated with EP-GCN/TMSPETA-HfO2 prior to being immersed in seawater. As a result, the coating has greater adhesive strength and can hold up even after a prolonged immersion. In light of this, the EP-GCN/TMSPETA-HfO2 nanocomposite may be used as a coating component in the automotive industry.

Abstract Image

含石墨氮化碳/硅化HfO2纳米填料的多功能环氧纳米复合涂层的阻燃和防腐性能
利用(3-三甲氧基硅丙基)二乙烯三胺(TMSPETA)对无机纳米填料氧化铪(HfO2)进行了改性。然后将得到的TMSPETA/HfO2包裹在石墨氮化碳(GCN)中,并放置在纯环氧树脂(EP)中。采用电化学方法研究了不同浓度GCN/TMSPETA-HfO2存在下环氧涂层对低碳钢在海水环境中的保护行为。结果表明,GCN/TMSPETA-HfO2添加量为0.6 wt %时,环氧树脂的耐蚀性最大。因此,进一步研究的最佳浓度为0.6 wt %。与纯EP相比,GCN/TMSPETA-HfO2的PHRR和THR值分别显著降低了73%和57%,表明该材料具有更好的阻燃性。盐雾试验结果表明,GCN/TMSPETA-HfO2在环氧树脂基体中的加入提高了环氧树脂的防腐性能,降低了环氧树脂的吸水率。EIS测试表明,即使在海水中暴露320 h,环氧树脂- gcn /TMSPETA-HfO2的耐涂层性仍提高了6.42E9 Ω·cm2。sem研究表明,EP-GCN/TMSPETA-HfO2纳米复合材料涂层钢具有最低的铁离子耗散(1.0 I/nA)。FE-SEM/EDX研究表明,硅化GCN在降解产物中得到增强,形成了持久的惰性纳米层状覆盖物。新创建的EP-GCN/TMSPETA-HfO2涂层具有令人难以置信的防水性能,WCA为165°。GCN包裹的TMSPETA-HfO2在环氧基体上具有较强的附着力和硬度,具有良好的力学性能。经EP-GCN/TMSPETA-HfO2涂层处理的低碳钢在浸入海水前的粘接强度提高了19.1 MPa。因此,涂层具有更大的粘接强度,即使在长时间浸泡后也能保持。鉴于此,EP-GCN/TMSPETA-HfO2纳米复合材料可作为汽车工业的涂层组分。
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