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为了考核评价舰船、舰载机等装备用三种涂层在热带海洋大气环境中的性能退化情况,设计了涂层在实验室模拟热带海洋大气环境中太阳辐射试验、湿热试验和盐雾试验的组合循环试验方法。通过实验室组合循环试验,分别检测了试验前后涂层的形貌、失光率、色差、附着力和电化学阻抗等数据。试验结果表明,随着试验时间的延长,三种涂层均出现不同程度的老化,失光率和色差呈增大趋势,附着力降低;但试验前后其老化机理未发生明显变化,电化学交流阻抗值基本保持在109Ω以上,涂层的厚度基本保持不变。综合三种涂层的性能退化对比,在工程实际应用中推荐优先选用4号或10号涂层。 相似文献
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清华大学研制的绝缘子防污闪、憎水、长效防护涂层经过近八年自然老化和多种污源地区大范围现场运行的考验,获得良好的使用效果,深受用户的欢迎并取得了显著的经济效益。本文简述了该类防护涂层在国内外的应用和发展情况,介绍了该涂层的基本性能和试验方法,并给出了该涂层的主要试验结果。 相似文献
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典型大气环境玻璃钢天线罩聚氨酯涂层工艺老化行为研究 总被引:1,自引:0,他引:1
通过南海海洋大气环境、海南万宁湿热乡村大气环境、西藏拉萨高原大气环境户外大气暴露对玻璃钢基灭线罩聚氨酯涂层工艺进行了老化试验,运用光泽、颜色、粉化率、SEM等手段测试了涂层在户外大气暴露的性能变化和表面形貌,并进行对比分析。结果表明,在相同大气环境中,工艺玻璃钢板/雷达罩底漆/浅灰航天聚氨酯涂层耐候性能优于工艺玻璃钢板/环氧聚酰胺/弹性聚氨酯磁漆涂层的耐侯性能;对于同种工艺,西沙海洋大气环境对其耐侯性的影响最大,其次是万宁湿热乡村环境,拉萨高原环境影响较小;光照、温度、湿度是涂层老化的主要原因。 相似文献
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有机材料主要经受光老化、盐雾、温湿度变化等环境影响,本文设计了一种光老化-盐雾复合试验方法,该方法将光老化和盐雾环境综合/组合在一起,体现了自然界中太阳光的光照和暗周期交替、盐雾的干湿交替、温度变化和湿度变化,更接近自然环境的真实情况。本文对8种有机涂层样品,分别进行了光老化-盐雾复合试验、GIB 150.7A试验、GB/T 16422.2试验和西沙永兴岛自然大气暴露试验,定量分析比较了这些方法的相关性与加速性,试验结果表明本文设计的光老化-盐雾复合试验优于GB/T 16422.2试验和GIB 150.7A试验,更适用于南海热带海洋环境。 相似文献
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介绍了偏苯三甲酸酐、三羟甲基丙烷等单体的用量对耐候聚酯树脂粉末涂料胶化时间的影响及l,6-己二醇、2-甲基-l,3-丙二醇等单体对提高耐候聚酯树脂粉末涂层低温抗冲击性能的作用。 相似文献
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辐射固化纳米环氧酚醛涂层在耐腐蚀、抗渗透、防结垢、防结蜡、耐磨损、抗细菌腐蚀、耐热性及绝热性等方面均有着突出的表现,在提高生产效率、节能降耗、安全环保等方面也有着积极的作用.这些突出的综合性将能够有效应对近年来的高温、高压、高含硫气田中频繁发生的集输管道腐蚀失效问题.在不久的将来,该类涂层可能会是石油化工管道功能性涂层中最好的选择之一. 相似文献
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A sorbent having a calcium oxide core and a clay shell was prepared and shown to be capable of reusable applications in absorption and desorption processes for carbon dioxide. The novelty of this sorbent is that only calcium carbonate and clay are used for its preparation with water as a binder. A two-step granulation procedure is used to get the core and then another step to coat the shell layer with the clay powder. A repeated wet-and-dry procedure probably makes the core porous yet strong enough to serve as a sorbent. The pellet is then calcined at 1200 degrees C for 2h to reach its final structure. The core-shell pellets have an overall diameter of 4.4mm with average shell thickness of 0.45 mm, crush load of 35 N and attrition index of 0.035 wt%/h. These results indicate that the pellets will probably be capable of withstanding the stress in future applications. Carbon dioxide absorption at or below 300 degrees C showed a maximum weight gain of 38% for our pellets. Finally, desorption in nitrogen at 800 degrees C can restore the pellet to its original state and hence it is ready for re-use as a sorbent. 相似文献
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根据对西安市临潼区自然状况与社会经济状况分析,在充分了解区域生态环境特征、地区差异及存在的主要生态问题的基础上,结合社会经济发展有利条件、制约因素,将该区划分为四个经济分区,对不同类型区域采取不同的社会经济发展和生态环境建设措施。 相似文献
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转炉烟气除尘水系统工艺系统中存在的强结垢倾向及其危害性,经采用了具有创新性的水质处理技术,达到了稳定生产,节能、环保、降耗的效果,收到较高的经济效益和环境效益。 相似文献
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Naveenprabhu Venkateswaran Naveen Subbaiyan Gopirajan Punniyakotti Varadharajan Suresh Vellingiri Abdul Rab Asary Jitendra Mohan Giri Pitchandi Petchimuthu 《环境质量管理》2023,33(1):293-301
The condenser is a piece of equipment used to effectively transfer heat from water to the environment. The fin and tube condenser is the most commonly used in commercial applications. The improved performance of heat transfer in the fin and tube condenser is a significant area of study all over the world because optimizing the efficiency of heat transfer in the condenser will contribute to enhancing the effectiveness of system performance. The vapor deposition, plasma spray, and thermal spray techniques are being used, and it is determined that a heat transfer enhancing coating improves condenser performance. This review discusses the nanomaterial coating over the fin and tube condenser in detail. The various nanomaterial coatings with various propositions and coating methods had been discussed with the evidence of previous researchers. At a 50-degree inclination angle on the condensate plate, the condensate over the coating surface increases by more than 30%. The thermal properties of the working fluid are improved over the condenser, and the overall effectiveness of the condenser is increased by approximately 40% over the non-coated condenser. A 1% volumetric concentration of Nanoparticles in the coated material achieves a maximum efficiency increase of 78.7%. 相似文献
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本文研究了四川十大功劳属植物资源的种类、地理分布特点、植物群落特征及形成的主要原因,并简要地讨论了保护资源与环境的对策。 相似文献
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老化测试为什么您更加需要它 总被引:4,自引:0,他引:4
AllenF.ZieInik 《环境技术》2007,25(4):39-41
塑料部件的老化测试逐渐成为防止潜在的产品失效的决定性步骤.随着越来越多的原始设备制造商开始向加工商征求设计及材料选择方案,使用过程中的老化失效责任也渐渐地进入了供应链. 相似文献
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ABSTRACTIn this paper, a wet chemical method is used to coat LiNi0.8Co0.1Mn0.1O2 (NCM811) cathode material by Li2O-2B2O3 (LBO) layer for Lithium-ion batteries (LIBs). For performance optimization, the effects of different contents (thicknesses) of LBO coating layers on NCM811 particle surface on the morphologies, structures, compositions, and electrochemical properties of the corresponding LIBs are studied using XRD, SEM, TEM, and electrochemical measurements. Coin LIBs are assembled with such coated NCM811 cathode materials for performance validation. Results show that LBO coating layer does not change the original lattice structure of the bulk material, it can only adhere to the surface of the bulk material. After coating, NCM811 shows a good crystallinity and the ordered layered structure. TEM images show that the thickness of LBO coating is increased with increasing LBO content, and that the appropriate LBO coating thickness and uniform coating state are conducive to the improvement of the electrochemical properties of NCM811 cathode materials. Particularly, NCM811 with LBO coating content of 1000 ppm shows the best performance compared to other coating contents. In this case, the coating thickness is relatively uniform, which is about 40~100 nm, giving a good first charge-discharge capacity of 214.1mAh/g, and a high Coulomb efficiency of 90.06%. After 50 cycles, the capacity retention rate of LIBs still keeps as high as 99.64%. Therefore, LBO coating can improve the performance of NCM811 and then the lithium-ion batteries. 相似文献