Correlation between Outdoor-exposure and Indoor-accelerated Ageing Test for Epoxy Coating

通过室外海洋大气暴晒和室内紫外线照射对环氧涂层进行了老化试验,并运用光泽、颜色、粉化率、SEM以及电化学多重动电位扫描(MCPDP)等手段测试了涂层在室外大气暴晒和室内紫外加速老化下的表面形貌和对金属保护性能的变化,初步探讨室外海洋大气暴晒和室内紫外人工老化试验的相关性。发现对于环氧涂层室内紫外人工老化降解的效果强于室外海洋大气天然老化,基于光泽测试的加速因子约为5;基于颜色和粉化率测试的加速因子都大于12。The outdoor-exposure test and indoor-accelerated ageing test were carried out,and a series of performance evaluations such as gloss,color,the degree of chalking,SEM and MCPDP were applied to test the transformation of the surface topography and protection properties of epoxy anticorrosion paint.The correlation between indoor-accelerated ageing test and outdoor-exposure test was discussed preliminary.It indicates that the results of degradation in the indoor-accelerated ageing test are greater than those in the outdoor-exposure test,the accelerating factor according gloss is about 5 and the accelerating factors according color and the degree of chalking are above 12

Study of the Simulation of Marine Atmospheric Exposure with Lab Accelerated Test of Marine Coating Systems

通过两年海洋大气环境暴露试验、盐雾/紫外冷凝老化交替试验和氙灯老化试验,对比聚氨酯涂料、丙烯酸涂料涂层的色差和失光率,研究了3种试验对涂层表观性能的影响,发现紫外/冷凝老化加速试验对海洋大气暴露试验有很好的模拟性。The simulation of marine atmospheric exposure with lab accelerated test was studied.The lab accelerated test methods were UV-condensation and salt-fog alternant test and Xenon-Arc exposure test.The marine coating systems based on polyurethane and acrylic were compared in color difference and rate of losing gloss.The result showed that UV-condensation and salt-fog alternant test can better simulate the marine atmospheric environment than the Xenon-Arc exposure test

Artificial Accelerated Aging (UV) Method for Performance Comparison of Organic Coatings

涂料在天然曝晒的条件下进行老化,需要很长的时间,不能快速比较其性能优劣,采用人工加速老化试验(氙灯老化法)对丙烯酸磁漆和聚氨酯面漆分6个周期(1周期:200hUV和50h盐雾)进行老化,用FTIR,SEM和光泽仪对老化的涂层进行分析表征,用交流阻抗(EIS)法来测试两种涂层抗渗水性能的强弱。结果表明,聚氨酯面漆抗紫外线的能力要比丙烯酸磁漆强;聚氨酯面漆的抗渗水性能强于丙烯酸磁漆。聚氨酯的综合性能强于丙烯酸磁漆。It needs a lot of time to examine the aging behavior of coatings under natural exposure condition, which makes it impossible to compare the performance of various coatings rapidly. Thus an artificially accelerated aging test was developed to evaluate the aging behavior of acrylic acid paint enamel and polyurethane top coating using a xenon lamp as the irradiation source. The acrylic acid paint enamel and polyurethane top coating were therefore aged by irradiating with ultraviolet for 200 h plus salt spraying for 50 h up to a total test cycle of six. The aged coatings were characterized using a Fourier transformation infrared spectroscope, a scanning electron microscope, and a luster device. The resistance to water infiltration of the two coatings was evaluated using EIS. Results showed that the polyurethane coating had better UV resistance and waterinfiltration resistance than the acrylic acid paint enamel.厦门市重点科技项目(3502Z20021087

Study on Correlation between Marine Environmental Test and Accelerated Tests in Laboratory for Ship Coatings——Coating Systems for Marine Atmosphere

采用光泽-色泽仪、涂膜粉化率测定仪、fdIr,SEM及AfM等现代测试分析手段,对海洋大气区7种常用舰船涂料体系在实际海洋环境暴露试验以及室内人工加速老化及腐蚀试验前后的涂层性能变化进行了对比分析,并结合厦门地区的气象环境谱探索了实验室加速试验与实际海洋大气暴露试验的相关性。Seven ship coating systems were exposed in marine atmospheric environment and accelerated weathering tests in lab.Some modern analyses,such as gloss and color measurement,coat chalk rating,precise thickness meter,FDIR,SEM,AFM were applied to characterize the properties of the coating systems.The results of performance change before and after exposure were compared.The weather environmental spectrum of Xiamen area was also combined for discussion of the correlation between marine environmental exposure tests and accelerated weathering tests in lab

JUNO Sensitivity on Proton Decay p→νˉK+p\to \bar\nu K^+ Searches

The Jiangmen Underground Neutrino Observatory (JUNO) is a large liquid scintillator detector designed to explore many topics in fundamental physics. In this paper, the potential on searching for proton decay in $p\to \bar\nu K^+$ mode with JUNO is investigated.The kaon and its decay particles feature a clear three-fold coincidence signature that results in a high efficiency for identification. Moreover, the excellent energy resolution of JUNO permits to suppress the sizable background caused by other delayed signals. Based on these advantages, the detection efficiency for the proton decay via $p\to \bar\nu K^+$ is 36.9% with a background level of 0.2 events after 10 years of data taking. The estimated sensitivity based on 200 kton-years exposure is $9.6 \times 10^{33}$ years, competitive with the current best limits on the proton lifetime in this channel