镁合金表面Mg-MOF-74/硅烷复合涂层的制备及耐蚀性

通过水热合成法制备了微米级的金属有机骨架材料Mg-MOF-74粉体,采用浸渍提拉法在AZ31B镁合金表面制备了掺杂一定量Mg-MOF-74粉体的硅烷涂层.使用扫描电镜和红外光谱仪研究了Mg-MOF-74掺杂对硅烷涂层表面形貌和组织结构的影响.结果表明:相比于单纯的硅烷涂层,Mg-MOF-74/硅烷复合涂层更加平整致密;...     

有机硅烷偶联剂在涂装前处理中的应用

介绍了一种新型的磷化替代技术——硅烷化处理技术。与传统的磷化相比硅烷处理操作简便、节能和环保。简述了硅烷偶联剂的结构与特点。讨论了硅烷技术在金属涂装前处理中应注意的问题。金属基体经过适当的硅烷溶液处理可有效地提高涂层与基体的结合力,从而提高基体材料的防腐性能。     

复合硅烷/锌涂层耐腐蚀性能的研究

通过电导率监视仪对硅烷的水解过程进行监控,确定了KH560的水解时间为3h,含不同质量分数鳞片锌粉的硅烷/锌复合液的水解时间为12h。将硅烷/锌水解液涂覆到低碳钢表面,制备了复合硅烷/锌涂层。通过盐雾试验、极化曲线和交流阻抗谱研究了不同锌粉含量的硅烷/锌复合涂层的耐蚀性能,通过扫描电镜观察了涂层的截面形貌,探讨了硅烷/锌复合涂层的耐蚀机理。结果表明,复合硅烷/锌涂层的耐蚀性能随着锌粉含量的增加而提高,鳞片锌粉的最大添加量为45%。此含量下的复合硅烷/锌涂层的耐蚀性能最好,中性盐雾时间达576h,是纯硅烷涂层的12倍。在此硅烷/锌复合涂层中,鳞片锌粉以平行叠加的方式组成致密的网状结构,从而延长了腐蚀性介质到达金属基材的时间,使涂层的耐蚀性能得到明显提高。     

元素有机聚合物及其涂料

201107044含硅基聚醚共聚物的硅烷涂料组合物、涂装金属表面的方法及其制备工件： 披露了含一种硅基共聚物的一种硅烷涂料组合物，用于处理金属（如钢、镀锌钢或铝）表面形成均匀转化和／或钝化涂层从而增加未涂漆金属或涂漆金属的耐腐蚀性和／或附着性的方法，以及涂有转化和／或钝化涂层的金属。     

海洋环境下涂层与硅烷对混凝土保护效果的对比

根据工程调研、暴露试验和室内试验的结果,分析比较了涂层和硅烷浸渍两种混凝土表面防护措施的保护效果.结果发现,实体结构中涂层的保护效果比硅烷差,但在暴露试验和室内试验中,涂层有比硅烷更好的抗氯离子渗透能力.涂层和硅烷保护不同龄期失效后,硅烷保护的混凝土自身扩散系数衰减因子低于涂层保护的混凝土扩散系数衰减因子.     

金属涂装硅烷前处理技术的研究进展

评述了金属涂装硅烷前处理技术的研究进展,对其成膜与防腐机理、工艺方法以及硅烷产品的改性做了详细的介绍。新型硅烷锆盐复合产品能够显著提高纳米膜层的耐蚀性,硅烷产品与高泳透力电泳涂料配套使用能够保证涂层的性能,硅烷产品稳定性的提高使其在工业生产中得到广泛应用。     

金属表面改性硅烷化处理研究进展

硅烷化处理是以硅烷偶联剂为主要原料的新型表面处理技术,常用于涂装前处理以提高金属基体与有机涂层的结合力或将其直接作为防腐蚀涂层。单纯的硅烷膜膜层较薄、表面有缺陷及裂纹,影响了其对金属的防护性能,需要对其进一步改性。综述了近年来国内外对硅烷化处理改性工艺的研究,详述了各种改性工艺对硅烷膜性能的影响,对耐蚀机理进行阐述,指出各种改性工艺存在的不足并提出进一步的研究方向。双层硅烷膜、添加纳米粒子、无机缓蚀剂、有机缓释剂以及硅烷与树脂复配等工艺明显提高了硅烷膜的性能,将多种改性工艺相结合可得到综合性能更加优异的硅烷膜。但还需要进一步研究改性机理,提高硅烷膜对不同基体的适用性及与涂装体系的配套性。     

金属工件涂装前处理技术的现状与展望

根据金属腐蚀理论,分析了金属材料与有机涂层表面与界面的关系,阐述了金属工件涂装前处理技术的现状,展望了节能环保型涂装前无磷、无铬的锆盐与硅烷处理技术,及低温等离子处理的技术发展趋势.     

氧化石墨烯掺杂对低碳钢表面硅烷涂层性能的影响

利用浸渍法在Q235低碳钢表面制备了氧化石墨烯(GO)掺杂的双?[3?(三乙氧基)硅丙基]四硫化物(BTESPT)硅烷涂层.分别采用扫描电镜、傅里叶变换红外光谱仪、电化学工作站和摩擦磨损试验机研究了氧化石墨烯掺杂对硅烷涂层的表面形貌、相结构、耐蚀性和耐磨性的影响.结果表明:氧化石墨烯掺杂后硅烷涂层表面更加致密,耐蚀性和耐磨性得到提高.     

防腐蚀涂料

<正>201401026纳米粘土粒子及硝酸铈对环保型溶胶-凝胶硅烷涂层在铝质底材上腐蚀性能的影响[刊,英]/Naderi,R.等//Surface and Coatings Technology.-2013(224).-93~100本文以纳米粘土粒子和硝酸铈为防腐剂配入环保型硅烷涂层体系,并研究了上述防腐剂对该涂层在纯铝底材上腐蚀性能的影响。该涂层含有缩水甘油氧丙基三甲氧基硅烷(GPS)、四乙氧基硅烷(TEOS)和甲基三乙     

附着力促进剂对光固化金属涂层附着力提升的研究

为了探究附着力促进剂对光固化金属基涂层附着力的影响，本文通过划格法、拉拔法及搭接剪切实验，系统研究了磷酸酯类附着力促进剂、硅烷偶联剂对光固化金属基（低碳钢、铝板）涂层附着力的促进作用。结果表明：磷酸类附着力促进剂能够显著提高光固化金属基（低碳钢、铝板）涂层的附着力，而硅烷偶联剂对光固化金属基（低碳钢、铝板）涂层的附着力无明显提升作用。     

The influence of aluminium surface pretreatment on the corrosion stability and adhesion of powder polyester coating

One of the most important factors in corrosion prevention by protective coatings is the coating adhesion loss under environmental influence. Thus, adhesion strength is often used when characterizing protective properties of organic coatings on a metal substrate. In order to improve the adhesion of organic coating the metal substrate is often pretreated in some way. In this work, the adhesion of polyester coatings on differently pretreated aluminium surface (by anodizing, with and without sealing, by phosphating and by silane film deposition) was examined. The dry and wet adhesion of polyester coatings were measured by a direct pull-off standardized procedure, as well as indirectly by NMP test. It was shown that under dry test conditions all polyester coatings showed very good adhesion, but that aluminium surface pretreated by silane film showed superior adhesion. The overall increase of wet adhesion for polyester coating on aluminium pretreated by silane film was maintained throughout the whole investigated time period. The different trends in the change of adhesion of polyester coatings were observed for different aluminium pretreatments during exposure to the corrosive agent (3% NaCl solution). The highest adhesion reduction was obtained for polyester coating on aluminium pretreated with phosphate coating. The corrosion stability of polyester coated aluminium was investigated by electrochemical impedance spectroscopy in 3% NaCl solution. The results confirmed good protective properties of polyester coating on aluminium pretreated with silane film, i.e. greater values of pore resistance and smaller values of coating capacitance were obtained in respect to other protective systems, whereas charge-transfer resistance and double-layer capacitance were not measurable during 2 months of exposure to a corrosive agent.     

双(p-乙酰胺基苯氧基)二甲基硅烷改性聚氨酯涂层的耐热性

将双(p-乙酰胺基苯氧基)二甲基硅烷(AAPDS)作为改性扩链剂加入到聚氨酯(PU)涂层的室温固化体系中,以改善PU涂层的耐热性能。运用凝胶时间测定仪和热失重分析仪(TGA)对不同AAPDS加入量对PU涂层的凝胶时间和热失重温度的影响进行了研究;并测试了涂层在金属基体上的附着强度随高温处理时间的变化。结果表明,向涂层固化体系中加入占多元醇总质量4.5%的AAPDS后,固化凝胶时间由未改性时的14.0 min缩短至12.1 min,涂层的初始失重温度和失重5%的温度由273℃和278℃分别提高到296℃和302℃;在400℃下高温处理120 s后附着强度保留率达到80.9%,远高于未改性涂层的57.1%。     

环保型金属表面硅烷处理剂的制备和应用

硅烷处理技术在金属涂装领域得到广泛应用,该技术在替代传统的磷化方面,具有节能、环保等突出的优点。文章论述了硅烷处理剂的作用原理、优势和特点,并通过具体案例描述了一种环保硅烷处理剂的基本配方及其施工工艺和性能。     

硅烷在油漆与涂料中的应用

介绍了硅烷在涂料中的各种最新应用,包括各种硅烷改性水性丙烯酸酯涂料、硅烷增粘底漆、硅烷溶胶-凝胶涂料及硅烷富锌底漆等。对涂料工程师在各种涂料配方中应用硅烷来提高涂料性能具有一定的借鉴作用。     

Silane and epoxy coatings: A bilayer system to protect AA2024 alloy

This work has proved that a good combination of a simple and fast metal pre-treatment, followed by the deposition of a thin layer of an organic–inorganic silane coating and further layer of epoxy coatings, are able to protect the aluminium alloy AA2024-T3 against corrosion in high concentrations of NaCl solution. The alloy AA2024 is one of the most employed aluminium alloy in structural applications due to its good mechanical properties. However, AA2024 alloy series commonly presents galvanic corrosion due to the rich content of copper element. The influence of different surface pre-treatments, the presence of a silane layer as pre-coating treatment and the influence of phosphonic acids combined with the silane layer on the corrosion protection and adhesion to the aluminium alloy have been examined using accelerated corrosion tests. High roughness and the presence of a pre-coating film between the metal surface and the organic coating were essential for a good protection and resistance to blistering appearance in the surface of AA2024-T3.     

铝及铝合金无铬表面处理技术研究进展

综述了铝及铝合金无铬表面处理技术,包括锆钛类处理、硅烷处理,稀土转化膜、高锰酸盐转化膜、钴盐转化膜、锂盐转化膜、有机酸转化膜等.目前在实践中获得应用的有锆钛转化处理和硅烷处理,但尚无一种无铬处理工艺能够完全代替铬酸盐处理工艺.     

Photogenerated cathodic protection and invalidation of silane/TiO<Subscript>2</Subscript> hybrid coatings

Silane/TiO₂ hybrid coatings were prepared on 304 stainless steel (304 SS) by a simple dipping method, where the silane is d-γ-methylacryloxy propyl trimethoxyl silane (CH₂=C(CH₃)COO(CH₂)₃Si(OCH₃)₃, MPMS). The photogenerated cathodic protection and invalidation of the hybrid coatings were evaluated by microstructure and electrochemical characterization. The coupling agent MPMS reduced the agglomeration of the nanosized TiO₂ powders and promoted the adhesion of the coatings. Barrier protection of the coupled metal was promoted for the hybrid coatings in a short corrosion time. However, MPMS decreased the carrier concentration of the TiO₂ electrode due to the large interface resistance. As a result, the corrosion potential shifted positively and the photogenerated cathodic protection decreased. In long-time corrosion, the hybrid coatings became invalid because of the accumulation of electropositive holes that may weaken the Ti–O bond and destroy the barrier effect.     

Silica based organic–inorganic hybrid nanocomposite coatings for corrosion protection

Silica based organic–inorganic hybrid nanocomposite coatings have been developed for corrosion protection of 1050 aluminum alloys by dip coatings technique. The hybrid sols were prepared by hydrolysis and condensation of 3-glycidoxypropyl-trimethoxysilane (GPTMS) and tetramethoxy silane (TMOS) in the presence of an acidic catalyst and bisphenol A (BPA) as cross-linking agent. Such prepared hybrid coatings were found to be relatively dense, uniform and defect free. Structural characterization of the hybrid coatings were performed using optical microscopy, scanning electron microscopy (SEM) and attenuated total reflectance-infrared (ATR-IR) spectroscopy. Corrosion resistance properties of the hybrid sol–gel coatings were studied by potentiodynamic scanning (PDS) and salt spray testing methods. The results indicate excellent barrier protection performance of the coatings. In addition, the effect of molar ratio of GPTMS–BPA (silane content) on corrosion resistance of the coatings was investigated. The PDS results demonstrated that the corrosion resistance of hybrid coatings improved by decreasing of silane content.     

Evaluation of surface treatments for glass fibers in composite materials

The thermomechanical stability of a number of organosilane surface treatments for glass fibers was evaluated for use in a fiber reinforced epoxy resin. All of the silane coatings were found to improve the tensile strength of E-glass filaments, particularly at large gauge lengths. A phenylamino silane and an amino silane were particularly effective in this regard. The fiber/matrix interface was evaluated as a function of temperature and after exposure to boiling water using a single-fiber composite test. All silane coatings transmitted a higher interfacial shear stress than obtained in composites with no coatings, and in all cases the shear stress transmission was considerably higher than would be expected from the yield properties of the resin. Measurements of the glass transition temperature of the epoxy resin, as well as Fourier-Transform Infra-Red analysis, indicated modification of resin properties in a zone around the glass fibers. Each of the silane coatings provided more stable thermomechanical properties than those obtained with uncoated glass, at least until the silanes were irreversibly degraded by boiling water. A phenylamino silane provided the most thermally stable properties. Finally, unidirectional E-glass fiber reinforced laminae were fabricated and the measured values of longitudinal strength were compared favorably to theoretical predictions.