彩钢板涂层加速老化与自然曝晒试验的当量加速关系研究

为研究彩钢板建筑涂层加速老化试验与自然暴晒试验的当量加速关系,以兰州地区为例,对镀锌钢板表面涂红、白、蓝3种颜色烤漆的试件进行了5个周期的加速老化试验和户外5个季度的自然曝晒试验。研究分析了3种颜色样板不同加速周期和曝晒时间的防护涂层失光、变色、粉化、起泡等老化现象,并基于失光率的失效标准,对加速老化和自然曝晒的彩钢板建筑表面涂层老化行为进行分析。研究表明,加速老化试验可以再现自然老化特征。考虑到涂层老化特征的多属性和动态性,针对不同颜色涂层采用多种拟合方法对两组实验数据进行拟合分析,选用3种拟合方法并结合相关函数描述失光率及老化特征量随时间的变化规律,构建出3种颜色样板涂层当量加速关系的表示形式,并得到加速老化试验环境谱与户外自然曝晒试验的当量加速关系为：红色样板0.80季度/周期,白色样板1.03季度/周期,蓝色样板0.93季度/周期。     

有防水涂层的丙纶工业老化试验研究

通过人工加速气候老化试验，研究了丙纶工业布的防水涂层、阻燃剂对老化性能的影响，为制备耐候、阻燃、防水的丙纶工业布提供了参考。     

有防水涂层的丙纶工业布老化试验研究

通过人工加速气候老化试验，研究了丙纶工业布的防水涂层、阻燃剂对老化性能的形响，为制备耐候、阻燃、防水的丙纶工业布提供了参考。     

PVC涂层膜材料老化研究进展

介绍了PVC涂层膜材料的光氧老化机理;系统地介绍了人工加速老化试验和自然老化试验方法及参照的国内外标准,并对材料老化后的测试方法做了介绍;最后分析了PVC膜材料在人工加速老化试验和自然老化试验下的相关性的研究现状及存在的问题。     

建筑涂层加速腐蚀老化试验方法标准及适用性研究

综述了建筑涂层及其各类产品标准中关于涂层耐久性试验的概况,总结了各类人工加速老化及加速腐蚀试验方法标准,对各类试验方法及其模拟的自然环境因素进行了评述,发现现有涂层加速腐蚀老化试验方法标准不完全适用于建筑涂层。分析了各单一老化试验方法的局限性,与之相比,综合老化试验方法能够更好地模拟建筑涂层实际使用情况。指出了国内建筑涂层耐久性评价试验方法标准体系的不足及发展方向。分析了衡量加速腐蚀老化试验有效性的几种常用的相关性评价方法,Spearman秩相关系数法是现阶段涂层老化最常用的相关性定量分析法,可用于建筑涂层加速老化试验相关性评价工作中。     

实验室水质对汽车外饰涂层氙灯老化试验的影响

采用不同等级的实验室用水对汽车外饰涂层进行氙灯老化试验，以研究实验室水质对结果的影响。结果表明，水中硅的含量是影响试验结果的主要因素。在对汽车外饰涂层产品进行氙灯老化试验时所用的水至少要满足GB/T 6682–2008《分析实验室用水规格和试验方法》中二级水的要求。     

建筑外墙涂料自然气候曝晒试验和人工加速老化试验的相关性研究

对建筑外墙涂料在自然曝晒场进行自然曝晒试验,并同时在实验室中进行人工加速老化试验,通过考察涂层光学性能随老化时间的变化规律,统计分析自然气候曝晒试验和人工加速老化试验的数据结果,研究人工加速老化试验模拟自然气候曝晒试验的相关性,探讨涂料使用寿命的推算。     

常温固化氟碳涂料耐老化性能研究

选择了4种氟碳树脂制备常温固化氟碳涂料,进行了物理机械性能测试,通过紫外光-冷凝法对涂层进行了加速老化试验。采用扫描电子显微镜(SEM)、原子力显微扫描电镜(AFM)、傅里叶变换红外光谱(FT-IR)、X-射线能谱仪(EDX)等现代分析手段,结合涂层光泽的测定,对经过不同老化时间的涂层表面微观变化与涂层光泽保持率变化进行了对应性研究。比较了4种氟碳树脂涂料的耐老化性能,并对氟碳树脂耐老化性能进行了理论分析,结果表明:FEVE氟碳涂料具有优异的耐老化性;以更大交替性的醚类单体和位阻型大单体合成的FEVE氟碳树脂具有更优异的耐老化性能。     

涂料和涂膜的检验、分析及评价

201211042耐候性对丙烯酸/三聚氰胺车用纳米复合涂料耐摩性能的影响 含有不同纳米SO2用量的丙烯酸／三聚氰胺清漆采用Xenotester老化试验箱进行耐候性测试,并对其不同暴晒时间后的耐摩性能进行了研究。就保光性而言,每个老化试验的涂层的抗划伤性用洗车模拟设备来进行评估,并用扫描电镜和光学显微镜观察洗车刷造成的涂层损伤情况。采用微米级和纳米级的划痕实验来研究涂层的硬度以及粘弹性变化。结果表明：老化试验初期,不同涂层的抗划伤性降低,这归因于此时的涂层表面较粗糙,从而增加了洗车刷与涂层表面之间的摩擦力;     

氟硅 /聚硅氧烷涂层体系在玉泉铁塔表面修复保护中的应用研究

为探索全国重点文物保护单位“玉泉铁塔”的封护涂层,采用与铁塔金相组织和化学元素类似的模拟铁质文物,选用氟硅 /低表面能聚硅氧烷复配涂层体系对模拟铁质文物表面进行保护,并在实验室内开展加速模拟老化试验研究,据表面形貌、粉化、开裂、剥落、起泡、锈蚀和失光等外观变化评价涂料的抗老化性能,并综合附着力、化学结构及电化学性能的变化,进一步分析该复配涂层体系防护性能及关键环境因素的影响。结果表明：选用的氟硅 /低表面能聚硅氧烷复配涂层体系具有优良的耐光老化、耐盐雾、耐湿热、耐水性能,经室内加速老化试验后,涂层的化学结构未发生明显变化,降解程度较小,涂层阻抗较高,与基底金属之间具有较高的粘结强度,呈现良好的防护性能。     

有机涂层环境适应性及表征技术研究进展

有机涂层的主要作用是保护金属不受腐蚀,然而,有机涂层在使用过程中经常受到太阳光、热和温度、水和湿气、氧和臭氧、污染物等的作用而产生老化现象,并伴随着各种性能的下降。论文综合论述了影响有机涂层老化的主要环境因素,以及为了模拟主要环境因素对涂层性能的影响而发展起来的试验室加速试验方法,近年来国内外发展起来的有机涂层自然环境适应性试验方法以及有机涂层老化性能检测、评价方法。     

奥运主体育场防腐工程用氟碳涂料天然曝晒试验与分析

介绍了奥运主体育场"鸟巢"防腐工程用氟碳涂料与其它类型氟碳树脂涂料在海南的天然曝晒试验数据与人工加速老化试验数据对比分析,并详细阐述了各种类型氟碳树脂涂料在耐老化性方面存在差异的原因。     

New accelerated weathering tests including acid rain

Aprocedure for the design of reliable accelerated weathering tests for service life prediction of automotive coatings was developed and used in designing an accelerated test based on SAE method J 1960. The influence of exposure conditions was investigated in several accelerated tests. Results from these tests and from Florida exposures were used to optimize test conditions. A test cycle that includes acid rain spraying was developed and evaluated by exposing 16 different coating systems using various methods. The results indicate that the new cycle is more reliable than a cycle commonly used today. P.O. Box 857, SE-50115 Bor?s. Sweden.     

紫外可见光谱法在材料耐老化性能检测中的应用

考察了树脂清漆的紫外吸收及加速老化情况,发现两种测试方法之间有很好的相关性,把紫外光谱法用于涂料产品配方的优选可以缩短试验周期,加快产品的开发速度。     

Comparison of organic coating accelerated tests and natural weathering considering meteorological data

The protective properties of organic coatings for outdoor applications are generally evaluated by means of accelerated laboratory tests, including electrochemical techniques. The coatings are stressed by different mechanical, chemical, thermal loads and the effects on the protective properties can be measured by using well established electrochemical techniques, like electrochemical impedance spectroscopy, electrochemical noise, etc. An open question is how these accelerated tests can be correlated with natural exposure in different environments.     

Corrosion performance of waterborne coatings for structural steel

Among recently developed waterborne coatings, epoxy and acrylic based coatings have a special place. To study this kind of anticorrosive coatings, use is normally made of natural exposure and laboratory tests. The literature has recently reported that the salt spray test is not suitable for selecting/studying anticorrosive waterborne coatings. In this paper, the authors present the main results obtained in an experimental study involving laboratory tests and natural exposure in two atmospheric test sites of different corrosivity categories. The natural exposure and accelerated tests are complemented by other measurements in the laboratory, involving water uptake, adhesion and electrochemical measurements, to understand the anticorrosive performance of the paint systems under study. As accelerated tests, salt spray and prohesion were used. Indirect measurements of adhesion were made using cross-cut and pull-off tests. Electrochemical impedance spectroscopy (EIS) and noise (EN) were used for electrochemical characterization. The study concludes that the best anticorrosive behaviour was shown by epoxy-polyamide paint systems, including zinc-rich primers. The correlation between the results of salt spray and natural exposure in marine test sites was significantly better than that obtained using the prohesion test. The electrochemical results showed that it is very important to pay special attention when interpreting this kind of results.     

Use of electrochemical noise method to investigate the anti-corrosive properties of a set of compliant coatings

This particular study has the aim of developing a new set of reduced VOC (also known as compliant) coatings. The reasoning for this is linked with the mass reduction scheme (MRS) and the requirement for environmentally friendly coatings. To this end a comparison needs to be made between these products and the higher solvent products which it is hoped that they will replace. Accelerated tests are required to get results in reasonably short times. Previous work has established the electrochemical noise method (ENM) as a useful technique for investigating the corrosion resistance of intact organic coatings on steel substrates. To date the most useful parameter obtained has been resistance noise (R_n) and results have shown that coatings that effectively protect the metal substrate demonstrate considerably higher R_n values and these remain high with time. In this work ENM has been used to monitor intact coatings under immersion conditions. Results will be given and compared with standard “salt spray” testing. The immersion test has also had a temperature cycle incorporated and this latter modification makes it effective at separating coatings within an even shorter time. The results so far look very promising and this test regime is helping the company to formulate the lower solvent replacements to be as effective from the anti-corrosion angle as the coatings which they will replace.     

Evaluation of barrier coatings by cycling testing

A variety of methodology which are supposed to accelerate and/or simulate the effects of time and environment, weathering, on organic coatings degradation are under development since long time. Taking into account that no test can duplicate all of the variables associated with a coatings environment, two modern accelerated tests were carried out and their investigation capabilities were compared: the Norwegian Norsok M 501 and the thermal cycling in electrolyte immersion. The first test highlighted the adhesion performances of coatings and the importance of the zinc-rich primers on the scratch protection. The thermal cycling test has lead to a very rapid loss of film properties. Electrochemical impedance measurements associated to this test have shown the relative importance of electrical resistance and capacitance in predicting corrosion protective performance in presence of very thick coatings.     

氙灯老化与自然曝晒测试所得颜料耐候性的相关性

比较了自然户外曝晒与氙灯加速老化测试之间的结果,试验表明,其间存在较好的相关性,用试验室加速老化试验来评估颜料和涂料体系的耐久性是可行的,并且是可靠的。     

A new acceleration factor for the testing of corrosion protective coatings: flow-induced coating degradation

For corrosion protective coatings that are designed to give lifetimes of protection that may extend to 50 years, valid accelerated test methods are necessary to develop improved systems and validate performance. Fluid flow over metals has long been believed to influence the corrosion process. Studies have been focused on the effects of flow rate on the corrosion of bare metals. The influence of fluid flow on the degradation of metal-protective coatings has received less attention. This paper describes a preliminary study on the influence of laminar flow on organic coatings. A Hele-Shaw cell and its associated fluid control apparatuses are incorporated into the electrochemical cell setup. The barrier properties of the coating as a function of immersion time and flow rate have been monitored by electrochemical impedance spectroscopy. We observe that the barrier properties of the coating measured electrochemically decrease exponentially with the increasing flow rate. We propose that the flowing electrolyte solution could be used in acceleration tests for the lifetime prediction of organic coatings as the acceleration of failure we have observed does not appear to change the mechanism of failure. Further analysis is proposed to validate immersion flow rate as a universal accelerating parameter for coating failure.