新型水性环氧富锌涂料的制备及性能研究

为了满足重防腐蚀领域对涂料耐久性的需要,通过调节环氧富锌涂料中锌粉的比例、添加硅烷偶联剂、优化涂料防沉体系,制备了耐腐蚀性能强、储存稳定性高的水性环氧富锌底漆.研究了该涂料中锌粉、偶联剂、防沉剂3种组分对涂层耐腐蚀性能、附着力及储存稳定性的影响,并将该涂层与环氧中间漆、水性聚氨酯防腐蚀面漆组成了复合涂层体系,分析测试了复合涂层体系的耐中性盐雾腐蚀性能及附着力.结果表明:制备水性环氧富锌底漆的过程中,控制有机膨润土和亲油性气相二氧化硅的含量可提高涂料的储存稳定性,其中锌粉加入量为55.0％(质量分数,下同),防沉剂有机膨润土和气相二氧化硅含量分别为0.8％和1.0％时,涂料的储存稳定性可达10级;硅烷偶联剂加入量为1.5％时,涂层与基体间的结合强度可达到11.3 MPa;该涂料作为底漆与环氧中间漆、水性聚氨酯面漆组成的复合涂层体系,在经过3 600 h中性盐雾试验后不剥落,可用于重防腐蚀领域.     

新型舰船船体防腐蚀涂料配套体系的研究

介绍了一种新型舰船船体用防腐蚀涂料配套体系。这种涂料体系是由防锈底漆 (水溶性快速固化无机硅酸锌底漆或有机富锌底漆 )、具有屏蔽功能的中间层涂料和具有特种光学性能的面漆组成的。通过实验室的常规性能试验、加速暴露试验和配套性试验对研制的防锈底漆、中间层涂料和面漆配套体系进行了筛选 ,并对筛选出的体系进行了实海环境暴露试验、模拟体实海浸泡试验以及实艇涂装应用试验。试验结果表明 ,该防腐蚀涂料体系在防腐蚀性能方面明显优于目前使用的涂料体系 ,符合海军对舰艇艇体特种光学性能的最新要求     

站台雨棚钢结构防腐蚀涂料的施工

介绍了适合于冬季施工的环氧聚氨酯富锌底漆，环氧聚氨酯中间漆和丙烯酸面漆的性能及施工工艺。讨论了用于火车站站台雨棚钢结构防腐蚀涂料的施工方案和管理方法。     

水性涂料在冶金设备上的应用

本文从水性底漆,水性面漆等方面,阐述了水性涂料在冶金产品中的应用,介绍了水性涂料的组成及施工工艺,以及其发展趋势。     

关于涂料安全,这些限值你应该知道

<正>2014年7月24日,国家标准委批准发布了GB 30981-2014《建筑钢结构防腐涂料中有害物质限量》强制性国家标准,标准适用于对建筑物和构筑物钢结构表面进行防护和装饰的溶剂型和水性防腐涂料,标准中分别就预涂底漆、底漆、联接漆、中间漆、面漆等不同种类溶剂型涂料,规定了VOC的限量要求。此项标准将于2015年5月1日起实施。我国涂料工业从20世纪初发展至今,已成为国民经济生活中不可或缺的重要行业。涂料的品种越来越多,应用范围也在不断扩大,目前已形成了以车用涂料、工业保护涂料、建筑涂料、家具涂料、卷材涂料等专用涂料为主,各种功能性     

涂料盐雾试样的勘误方法研究

在盐雾试验的基础上,对涂料试样提出了2种拓展考察的方法:残余附着力测试和划"×"处金属腐蚀状态勘验。在高氯化底漆+高氯化面漆、环氧底漆+高氯化面漆、环氧底漆+工程面漆和高氯化底漆+工程面漆等不同的涂料体系,通过试验得出了高氯化涂料具有突出的封闭阻挡性能,但涂层发脆。工程面漆与底漆粘附力较差,环氧底漆具有突出的基体附着力,与高氯化面漆配合,是性能优良的防腐涂料体系。     

重工业污染区输电线路杆塔防腐蚀涂层配套体系的选用

为了给重工业污染区输电线路杆塔钢构件提供既耐蚀、又耐候的防护,选用经过特殊改性研制的低表面处理底漆与高性能中间漆及面漆组成配套涂层体系,通过实验室模拟试验以及现场挂片暴晒试验研究了该配套涂层体系在强腐蚀介质环境中的耐蚀性能和耐候性能.结果表明:防锈底漆+环氧云铁中间漆+丙烯酸脂肪族聚氨酯面漆的配套涂层体系具有优良的耐盐雾腐蚀性能和耐海洋大气腐蚀性能,可以满足重工业污染区输电线路杆塔对于现场修复施工与重防腐蚀性能的双重要求.     

城市污水处理厂钢制设备的腐蚀与防护

为寻找城市污水处理厂中钢结构设备有效的防腐蚀方案,通过对其腐蚀介质和腐蚀环境的分析,筛选出了合适的防腐蚀涂装体系,对所选择的防护涂层的性能进行了试验验证并在工程实际中应用.结果显示,对完全浸泡的设备,采用环氧富锌底漆 环氧云铁中间漆 改性环氧面漆的涂层体系有很好的防护效果;对干湿交替的设备采用环氧富锌底漆 环氧云铁中间漆 丙烯酸聚氨酯面漆的防护体系具有良好的防护性能,预计其防护寿命可达到8 a以上.     

水性防火涂料成分对防火时间的影响

为了探讨水性防火涂料成分对防火时间的影响,以模拟大板燃烧法研究了其组分乳液、颜料、脱水催化剂、成炭剂、发泡剂不同用量时的防火效果.结果表明:水性防火涂料的防火时间主要受膨胀海绵状炭质层的膨胀高度、泡孔尺寸以及炭质层表面形成的白色无机物质连续程度等因素影响;水性防火涂料中基料、颜料、防火组分含量影响了膨胀海绵状炭质层的结...     

水性膨胀型钢结构防火涂料耐火性能研究

以水性乳液为基体,聚磷酸铵(APP)、三聚氰胺(MEL)、季戊四醇(PER)为膨胀阻燃体系,通过添加可膨胀石墨(EG)和绢云母制备了水性膨胀型钢结构防火涂料;研究了基体拼合、膨胀阻燃体系配比、EG与绢云母配比对钢结构防火涂料性能的影响。结果表明,氯偏乳液与纯丙AC261P乳液质量比为22∶3,APP/MEL/PER的质量比为4∶3∶3,可膨胀石墨和绢云母的质量比为5∶3时,制备的防火涂料受热后形成的炭质层与钢板粘附性好、强度高,膨胀倍率大,持续耐火性能最好,受热4500s后钢板背面温度维持在223℃。     

污损释放型防污漆用连接漆的应用研究

采用XPS、附着强度、耐海水浸泡等测试手段,研究了一种三组份有机硅环氧连接漆与防锈底漆和污损释放型防污漆界面化学键合强度。结果表明：有机硅环氧连接漆可以与防锈底漆发生界面化学键合,当附着促进剂添加量为6．0％时,与防污涂层连接效果最佳。     

桥梁钢结构长期效防腐技术及在厦门第二东通道中的应用

介绍了国内外长期效防腐技术现状:一是较为成熟的以喷涂金属涂层作为底漆的复合涂层体系,二是以富锌底漆为配套的重防腐涂层体系.列举了 3种典型桥梁钢结构大气区防腐涂层配套试验室测试差异.根据厦门第二东通道所处的环境特点,结合国内外桥梁钢结构防腐技术,为项目提出可行的钢箱梁外表面防腐蚀技术方案为"环氧富锌底漆-环氧中间漆-氟...     

On the performance and failure mechanism of thermal barrier coating systems used in gas turbine blade applications: Influence of bond coat/superalloy combination

Surface engineering plays a major role in achieving the performance and design lives of gas turbine components such as the high pressure turbine aerofoils which operate under the most arduous conditions of temperature and stress leading to a wide range of thermal and mechanical loading during service. In this study, emphasis is placed upon the role of composite systems consisting of bond coat and superalloy substrate in determining the performance and useful life of thermal barrier coatings using yttria-stabilized zirconia as top coat processed by electron-beam physical vapor deposition. Three platinum-modified bond coats of the diffusion type and three nickel-based superalloys are included in the study. Thermal exposure tests at 1150 °C in air with a 24-hour cycling period to room temperature have been used to rank the performance of the coating systems. Various electron-optical techniques have been used to characterize the sequence of events leading to coating failure as marked by spallation of the top ceramic coat. It is shown that for a given superalloy substrate, the coating performance is dependent upon the type of bond coat. Conversely, for a given bond coat, the performance becomes a function of the superalloy composition used in the application. However, in both cases, coating failure is found to be predominated by loss of adhesion between the thermally grown oxide and bond coat indicating that the respective interface is the weakest link in the system. The results are interpreted in terms of the phase transformations which occur in the bond coats during exposure at elevated temperatures and the corresponding effects on their oxidation behavior.     

有机硅溶胶复合处理的锌铬膜涂层

为了进一步探索改善锌铬膜涂层性能的途径,扩大锌铬膜涂层的应用范围,采用有机硅溶胶材料对锌铬膜涂层复合处理,并进行性能测试.通过中性盐雾腐蚀、二氧化硫腐蚀、酸性介质腐蚀失重、流水喷淋冲刷前后的盐水浸泡腐蚀失重和附着力以及涂层的硬度测试,对比了锌铬膜涂层采用有机硅溶胶材料复合处理前后的性能变化.结果表明:经过复合处理后的锌铬膜涂层在中性和酸性环境条件下的耐腐蚀性能、耐流水冲刷性都有了大幅度的提高,涂层的硬度进一步增强,使锌铬膜涂层在更为广泛的领域的应用成为可能.     

Tailoring protective coatings for all‐oxide ceramic matrix composites in high temperature‐/high heat flux environments and corrosive media

The application range of porous all‐oxide ceramic matrix composites (CMCs) can be significantly extended through deposition of protective coating systems. Typical applications include protection against erosion, wear and foreign object damage as well as a reduced permeability. Environmental barrier coatings (EBC) are mandatory in order to guarantee sufficient lifetime of the CMC components under high temperature‐, high heat flux conditions and corrosive attack (combustor liners, thermal protection systems for atmospheric reentry). Limited thermal stability of today’s oxide fibers requires additional thermal barrier functionality for EBCs in order to keep the effective CMC bulk temperatures below 1200 °C. Depending on the specific application DLR’s coating concept for all‐oxide CMCs is based on either a single reaction‐bonded aluminium oxide (RBAO) coating or a hybrid coating system consisting of a RBAO bond coat followed by an EB‐PVD YSZ/FSZ top coat and is highlighted for three case studies. Deposition techniques (magnetron sputtering, MOCVD) alternative to EB‐PVD as well as the suitability of fibrous and cellular materials for thick EBC/TBC layers are explored.     

水力机械胶粘耐磨涂层的制备及性能研究

为了提高在腐蚀与磨损环境下金属机械设备的使用寿命,采用胶粘涂层法制备了具有耐冲蚀磨损性能的水力机械胶粘耐磨涂层.富锌环氧底层和环氧云铁中间涂层均能有效地防止氧、水和盐等腐蚀介质对金属基体的侵蚀,改性的环氧耐磨表面层则具有优异的耐冲蚀磨损性能.采用自制砂流冲蚀试验机对涂层的耐磨损性能进行测试,结果表明,涂层的磨损率平均值为0.012%,具有比同类产品更好的耐冲蚀磨损性能;底部涂层与基体间相互吸附、涂层间相互扩散、基材表面与底部涂层机械互锁,均能使涂层与涂层之间、底层与基体之间在界面处形成牢固的结合,有利于提高涂层的抗冲蚀磨损性能.     

多壁碳纳米管的表面改性及其在防火涂料中的应用

利用两亲性聚合物对多壁碳纳米管(MWCNTs)进行改性,采用红外光谱、热重分析手段对改性MWCNTs进行表征;将改性MWCNTs应用到膨胀型防火涂料体系中,研究了其对防火涂料性能的影响.结果表明:在适合的条件下两亲性聚合物可以被引入到多壁碳纳米管表面,改性后的MWCNTs在醋酸丁酯和水中具有良好的溶解性;合适含量的改性MWCNTs可以提高防火涂料受火后的炭化层强度和膨胀倍率,降低背温升高速率,增强涂层的抗开裂性能.     

汽车修补漆在豪华大客车上的应用

针对目前豪华客车对漆膜外观性能的更高要求,列出了客车涂装的常见问题:如使用2～3 a后腐蚀,漆膜饱满度、雾影差等,提出了常规解决方案.根据以上问题指出底漆、中涂、面漆的选用原则:底漆应选用磷化底漆加环氧底漆的组合,中涂应能填补缺陷,面漆光泽大于83%(20°),桔皮L小于15,S小于35.同时给出了具体的施工工艺及温度、湿度和喷涂方法等注意事项.实测结果表明,涂膜外观基本达到轿车水平.但客车涂装还需提高工艺水平以达到质量的稳定.     

Evaluation of mixed oxide formation and sintering behavior in thermal barrier coatings on nickel‐based superalloy

Thermal barrier coatings are widely used in aircraft turbines to protect nickel‐based superalloys from the effect of high temperature oxidation and hot corrosion. In this study, both NiCrAlY bond coat and yttria‐stabilized zirconia top coat were deposited using atmospheric plasma spray technique. After coating production, specimens were exposed to oxidation in air atmosphere at 900 °C, 1000 °C and 1100 °C for different periods of time up to 50 h. Microstructural transformations in the ceramic top coat and growth behavior of the thermally grown oxide layer were examined using scanning electron microscopy, porosity calculation, elemental mapping and hardness measurement. Formation of different types of oxides in the thermally grown oxide layer shows that this process strongly depends on deposition technique as well as on oxidation time and temperature. Hardness values of the top coat increased with a decrease in the porosity of the top coat. Uniformity and homogeneity of the thermally grown oxide layer and densification of the top coat were evaluated in terms of the structural durability of thermal barrier coating systems.