取向硅钢含铬无机绝缘涂层的研究进展

绝缘涂层可以有效提高硅钢片的耐蚀、耐腐、磁、绝缘等性能,因此取向硅钢涂装绝缘涂层是取向硅钢生产过程中重要的一环.本文对取向硅钢含铬无机绝缘涂层以及氮化铬涂层的性能优缺点进行了介绍,并对国内无机含铬取向硅钢绝缘涂层及氮化铬涂层的研究现状进行了综述.最后对未来含铬无机绝缘涂层的研发方向进行了展望.     

溶胶-凝胶法制备防腐耐磨杂化涂层的研究进展

有机无机杂化涂层兼有机涂层和无机涂层的双重特点和性能,具有优良的机械性能和阻隔作用,成为材料防护涂层研究的热点。阐述了溶胶-凝胶法合成有机/无机杂化涂层材料的原理和步骤,介绍了有机/无机杂化涂层在材料防腐耐磨方面的研究现状,提出了利用溶胶-凝胶法制备防腐耐磨杂化涂层存在的一些问题。     

AP1000核电站钢制安全壳无机富锌涂层直线对接工艺研究

基于无机富锌涂层优良的防腐性能和热传导性能,AP1000核电站钢制安全壳广泛采用了无机富锌涂层进行防护。通过对不同厂商的无机富锌涂层直线对接工艺研究,获得了一整套对接施工工艺,研究了接缝区域的力学性能并对两种涂层的颜色进行了对比分析。在工程实践中实现了同一台安全壳设备采用不同厂商的无机富锌涂层对接施工,降低了工程建设中受单一涂层制约的风险。     

EIS法研究3种配套涂层体系的腐蚀电化学行为

采用电化学阻抗谱(EIS)研究了由水性无机富锌底漆、环氧中间漆和氯化橡胶面漆3种涂料配套而成的3种不同涂层体系在3.5%NaCl溶液中的电化学腐蚀行为,考察了氯化橡胶面漆、水性无机富锌底漆／氯化橡胶面漆、水性无机富锌底漆／环氧中间漆／氯化橡胶面漆这3种涂层体系的阻抗谱在浸泡过程中的演化并据此比较了3种涂层体系的防护性能。结果表明,两涂层体系的防护性能比单涂层的还要差,三复合涂层体系的防护性能最好。根据涂层腐蚀电化学阻抗谱特征推测,中间漆在三复合涂层体系中起到了使底漆和面漆结合更加紧密的桥梁作用。     

海泡石/空心微珠/环氧树脂复合涂层在镁合金表面的隔热性能研究

通过SEM、TGA、隔热性能测试等方法研究了加入不同量无机填料的环氧树脂复合涂层的结构和性能。无机纤维海泡石的加入提高了环氧树脂的耐热性能,同时在空心微珠之间起到填充和阻热的作用。当纤维状无机填料海泡石与球状无机填料空心玻璃微珠的加入量分别达到15%时,厚度约3.0mm的涂层在经受500℃高温2 min后,镁合金基体背面温度大约为300℃。随着无机填料加入量的进一步增加,隔热效果反而变差。在实验结果的基础上,建立了两种填料高分子复合材料的传热模型,分析了两种填料在涂层隔热过程中的作用机理。     

镀锌板自润滑涂层的研究进展

镀锌板自润滑涂层是在镀锌板表面涂覆具有润滑性的涂层,在冲压、成形等机械加工过程中不需在锌板表面涂润滑油,可直接使用,具有良好的润滑性和耐腐蚀性能。综述了镀锌板自润滑涂层的特点、制备工艺、成膜机理,介绍了镀锌板的有机自润滑涂层和无机自润滑涂层。     

可再分散聚合物改性无机硅酸锌涂层的耐化学性研究

以可再分散聚合物对无机硅酸锌涂料进行改性,通过浸泡试验及浸泡后柔韧性检测方法研究了改性无机硅酸锌涂层的耐酸、碱、盐等性能.结果表明,经可再分散聚合物改性的无机硅酸锌涂层其耐酸、碱、盐的能力都有不同程度的提高.涂层微观结构分析发现,可分散聚合物的连续成膜有效降低了无机硅酸锌涂层的孔隙率,从而增大了电解质溶液向涂层内部渗透的阻力以及成膜过程中对活性较高的锌粉的包覆作用.该改性涂层无毒、环保,添加方便,具有较好的应用前景.     

二次喷涂改性无机涂层

首先提出一种相对简单的方法对无机涂层材料进行改性,即在处理的铝合金表面制备水性无机涂层,然后在无机涂层表面二次喷涂KH-550改性溶胶,对其进行改性,再经烘烤制备了有机改性无机涂层.对二次喷涂KH-550改性溶胶的一些因素对涂层表面性能影响的研究表明KH-550用量≥20%,能明显提高无机涂层的附着力、耐冲击性、耐水性等理化性能.对二次喷涂后涂层的微观形貌和接触角测试结果表明,在KH-550改性溶胶中引入无机纳米或超细粉体,获得了致密、平整的多功能涂层.最后通过对所提出方法的原理探讨及实验结果的分析,确定二次喷涂KH-550溶胶改性无机涂层材料,制备有机改性无机涂层的方法可行.     

钢结构防火涂料中复合泡层结构的研究

有机膨胀型钢结构防火涂料缺点是涂层中有机物易分解，且遇火时释出有毒物质。无机膨胀型钢结构防火涂料采用无机低温发泡层和高温发泡层的复合泡层，解决了火灾中钢结构前期升温快和后期阻火涂层熔问题，综合性能好。文中探讨了无机复合泡层梯次发泡机理，涂料配方与涂层结构对防火涂层的阻火隔热性能的影响。     

溶胶-凝胶杂化涂料的技术原理与最新应用

无机-有机杂化涂层具备无机涂层和有机涂层的双重特点和优异性能,具有广阔的应用前景。本文综述了溶胶-凝胶法(Sol-Gel)合成无机-有机杂化涂层材料的原理和步骤,重点阐述了基于溶胶-凝胶法制备的杂化涂料产品的最新应用,指出了这一研究领域新的应用方向。     

Corrosion protection by zirconia-based thin films deposited by a sol–gel spin coating method

This paper focuses on the structure and corrosion behavior of 316L stainless steel coated by inorganic ZrO₂, hybrid ZrO₂–PMMA, and combined inorganic–hybrid films. The coatings were deposited by a particulate sol–gel spin-coating route, using carboxymethyl cellulose as a nanoparticle dispersant. The electrochemical evaluations were conducted in a simulated body fluid, via potentiodynamic polarization and impedance spectroscopic experiments. According to the results, the hybrid coating presented a better corrosion protection compared to the inorganic coating, due to a lesser density of structural defects. However, the best corrosion resistance was found for a combined coating which consists of an inorganic bottom layer and a hybrid top layer, due to a desirable compromise of good adhesion and low defect density.     

热镀锌钢板纳米二氧化硅改性有机-无机复合膜

研究了热镀锌钢板纳米SiO2改性有机-无机复合膜,研究了不同的纳米SiO2的加入形式对膜层耐蚀性的影响,探讨了该复合膜中钒酸盐的缓蚀作用,该复合膜层具有良好的成膜性能和耐蚀性能.     

高磷化学镀镍光亮剂的研究

研究了无机、有机、复合光亮剂对高磷化学镀镍镀层外观、表面微观形貌、沉积速度、磷含量、孔隙率及耐蚀性的影响。试验证明:添加无机光亮剂时,镀层光亮,但存在微孔结构,导致孔隙率升高,耐蚀性大幅下降;添加有机光亮剂时,镀层光亮性略有下降,但镀层均匀性好,缺陷少;而复合光亮剂则可以实现较理想的效果,其镀层外观光亮,表面平整细致,沉积速度快,整体性能优良,复合光亮剂组成为:2mg/L Ce(SO4)2、3 mg/LTe(SO4)2、30 mg/L C6H5SO2Na、2 mg/L N,N-二乙基丙炔胺(DEP)。     

醇溶性无机富锌涂料的研究与应用

醇溶性无机富锌涂料是以硅酸烷基酯为基料,配以锌粉以及其他颜填料、溶剂、助剂等制成。主要介绍了醇溶性无机富锌底漆的防腐机理、配方研究和检测结果,试验证明聚乙烯醇缩丁醛的加入能显著改善漆膜的性能,采用磷铁粉代替部分锌粉后,涂料的防腐蚀性能会有所下降。同时介绍了醇溶性无机富锌涂料的应用领域及使用注意事项。     

电化学阻抗技术在金属腐蚀及涂层防护中的研究进展

本文论述了交流阻抗谱(EIS)在金属腐蚀与涂层防护中的研究进展,重点探讨了交流阻抗技术在钢铁材料腐蚀、有机涂层和金属涂层以及模拟深海环境中有机涂层的耐蚀性能和腐蚀机理的研究进展。最后指出了交流阻抗数据分析拟合中存在的问题,并对电化学阻抗谱在腐蚀领域及其他方面的应用进行了展望。     

Corrosion study of hybrid sol–gel coatings containing boehmite nanoparticles loaded with cerium nitrate corrosion inhibitor

To improve the corrosion protection of sol–gel derived hybrid silica/epoxy coatings containing boehmite nanoparticles, inorganic corrosion inhibitor was introduced into the coating via encapsulation in the nanoparticles. The morphology and chemical structure of the deposited films were studied by Scanning Electron Microscopy (SEM) and Fourier Transformed Infra-red Spectroscopy (FT-IR). The anticorrosion and self-healing properties of the coatings were evaluated by Electrochemical Impedance Spectroscopy (EIS). The high corrosion resistance performance of such coatings is due to the presence of encapsulated cerium nitrate corrosion inhibitor that can be released at the defects within the coating, hindering the corrosion reactions at defective sites.     

Corrosion study of hybrid sol–gel coatings containing boehmite nanoparticles loaded with cerium nitrate corrosion inhibitor

To improve the corrosion protection of sol–gel derived hybrid silica/epoxy coatings containing boehmite nanoparticles, inorganic corrosion inhibitor was introduced into the coating via encapsulation in the nanoparticles. The morphology and chemical structure of the deposited films were studied by Scanning Electron Microscopy (SEM) and Fourier Transformed Infra-red Spectroscopy (FT-IR). The anticorrosion and self-healing properties of the coatings were evaluated by Electrochemical Impedance Spectroscopy (EIS). The high corrosion resistance performance of such coatings is due to the presence of encapsulated cerium nitrate corrosion inhibitor that can be released at the defects within the coating, hindering the corrosion reactions at defective sites.     

无机粉体材料的表面处理方法

无机粉体材料的表面包覆及改性是近年来冶金及材料界为寻求制备新型材料而涌现的一个新的研究领域。粉体材料经无机包覆后，表面可具有新的物理化学性质，制成的复合粉体可用于陶瓷、催化、防腐、颜料、粘结、电子等行业。本文对无机粉体材料的表面处理方法进行了详细综述。     

Effect of ceria and zirconia nanoparticles on corrosion protection and viscoelastic behavior of hybrid coatings

Organic–inorganic hybrid nanocomposite coatings contain inorganic particles that are dispersed in organic phase in nanometric dimensions. Ceria and zirconia colloidal dispersions are uniformly distributed in the epoxy silica-based hybrid nanocomposite by sol–gel method and coated on 1050 aluminum alloy substrate with spin-coating technique. The hybrid sol is prepared by organic–inorganic precursors formed by hydrolysis and condensation of 3-glycidoxypropyltrimethoxysilane and tetraethylorthosilicate (TEOS) in acidic solution using bisphenol A as networking agent and 1-methylimidazole as initiator in the presence of various ratios of ZrO₂ and CeO₂ colloidal nanoparticles. Particle size distribution, surface morphology and inorganic components distribution were determined by scanning electron microscopy (SEM) and EDXA techniques. SEM and Si, Zr, Ce mapping micrographs proved the uniform distribution of nanoparticles in the coatings. Transmission electron microscopy indicated that the nanoparticles dimension stay at the nanoscale level. The glass transition temperature (T _g) and loss properties (damping) of coatings were evaluated by dynamic mechanical thermal analysis. The corrosion protection of the coatings on the 1050 AA substrate was studied by potentiodynamic measurements. The results indicated that by introducing ceria nanoparticles in 1:1 molar ratio to TEOS in coating composition, corrosion protection was improved. However, the simultaneous presence of two nanoparticles (i.e., ceria and zirconia in 1:1 molar ratio) in the coating compositions increased the corrosion protection efficiency up to 99.8 %. The multiple glass transitions and shifting to higher and wide range of temperatures by adding ceria and zirconia nanoparticles indicated a better network interaction between inorganic nanoparticles and organic molecular chains which also led to better corrosion protection of the coating in this composition.