HVOF—热喷涂领域的新成员

综述了ＨＶＯＦ的发展过程、原理、特性及涂层特性，介绍了喷枪的主要类型、构造以及该工艺的应用现状及其发展前景。     

织物用有机硅涂层剂研究新进展

简要介绍了有机硅涂层剂的特性,着重阐述了近年来新研发的织物用有机硅涂层剂的制备方法及应用,指出了今后有机硅涂层剂的研究方向。     

TiO2—矿物微粉复合材料的紫外线屏蔽特性

在ＴｉＯＳＯ４为合成膜层物质的基本原料，利用均一沉淀法的滑石，云母微粉的片状粒子表面被覆ＴｉＯ２超细粒子涂层，主要研究了涂层粒子超细化对复合材料紫外线屏蔽特性的影响。     

橡胶制品表面涂层的研究进展

橡胶制品经表面涂层改性后，具有了许多新的优良特性，制品抵御外界不良因素侵害的性能也得到了一定程度的提高，改性后的橡胶制品其应用领域也得到了进一步的拓宽。目前国内外在橡胶制品表面涂层改性的研究领域已经取得了一定的成果，尤其在抗老化、抗菌、抗磨损等领域最为突出，部分产品已经实现了工业化生产。笔者介绍了国内外橡胶制品表面涂层改性的研究进展，提出了我国应加强橡胶制品表面涂层这方面的研究，并对橡胶制品表面涂层的发展前景做了展望。     

低气压等离子喷涂TiO2时涂层的电学性能研究

本研究通过改变低气压等离子喷涂TiO_2时的工艺参数,发现了氧化钛涂层还具有优良的导电性和光电流-电位特性。涂层的电导率与喷涂过程中TiO_2的失氧量成比例增加。涂层的光电流-电位特性依赖于涂层结构,当金红石型TiO_2涂层中含有适量的Ti_3O_5和Magneli(Ti_nO_(2-1),4≤n≤10)相时,表现出优良的光电流-电位特性,并与光强度成正比例关系。若涂层全部由金红石型TiO2或Ti_2O_3、Ti_3O_5和Magneli相组成时,光电流-电位特性消失。     

食品包装涂层用树脂对镀锡板基材附着性能的影响

本文以食品包装材料常用环氧涂层和环氧改性聚酯涂层为例，利用附着力测试、 SEM、XPS和 EDS等分析表征方法，从涂层组成及结构、基材 -涂层的表面 -界面特性等角度出发，分析了不同树脂涂层对镀锡板基材附着性能的影响。研究发现：涂层树脂的种类不同，涂层对镀锡板基材的附着性能存在差异。论文还初步探究了环氧涂层和环氧改性聚酯涂层对镀锡板基材的附着机理。     

氟树脂涂层在聚乙烯装置设备中的应用

针对聚乙烯生产装置中介质为聚乙烯粉料的设备，介绍了氟树脂涂层设备在聚乙烯装置设备中的应用，讨论了氟树脂涂层设备的技术特性、结构、制造等特点，就氟树脂涂层的材料、涂层厚度的选择，喷涂工艺，检验项目和方法等进行了论述。并着重介绍了氟树脂涂层生产工艺过程中的若干工艺要点。     

碳纳米管增强胶黏陶瓷涂层的制备及性能表征

利用溶胶凝胶法制备了胶黏陶瓷涂层,为了提高涂层的综合性能,在涂层中添加了少量的羟基化碳纳米管.对涂层的形貌、显微硬度、摩擦磨损特性进行了分析,结果表明:添加碳纳米管的涂层光滑平整且碳纳米管在涂层中分散均匀;添加0.3wt％碳纳米管的涂层,显微硬度达到最大值750 HV,碳纳米管再次增加时,显微硬度开始下降;植入0.5wt％碳纳米管的涂层,摩擦系数和磨损量分别为0.35和0.573×10-3 mm3/Nm,涂层的摩擦磨损特性最佳.     

40TiO2—Al2O3球形喷涂粉末性能研究

本文对重庆仪表材料研究所研制的４０ＴｉＯ２－Ａｌ２Ｏ３球形喷涂粉末的物理性能和涂层性能进行了分析讨论。结果表明,该球形粉末相对于其它４０ＴｉＯ２－Ａｌ２Ｏ３粉末,具有显著的球状特征,由此带来流动性好,熔化特性均一的优点,因而其工艺性能良好,制得的涂层性能优良。     

涂层钢管发展动向

涂层钢管耐腐蚀,耐高低温,耐磨、耐阴极剥离,在美国和日本应用广泛,已占全部配管量的25～50％。叙述了涂层钢管的分类、特性、开发过程及发展趋势。     

铜包铝线腐蚀过程与机理初探

采用扫描电镜、金相显微镜和电化学工作站等对铜包铝线小孔腐蚀和电偶腐蚀的表面形貌、腐蚀速度和特点展开系统研究。分析了镀层保护期、局部脱层期和腐蚀破坏期等不同阶段特点。分析了腐蚀机理,探讨了腐蚀和镀层与基体的结合力的关系。对电镀工艺和镀后处理方法提出了改进意见和措施。     

海洋环境下螺纹紧固件复合防腐技术

针对海洋环境下螺纹紧固件的腐蚀特点及类型,提出真空渗锌/锌铬涂层复合涂覆层的方案。详细介绍了复合涂覆层的制备工艺,通过中性盐雾试验比较了化学镀Ni–P合金镀层、真空渗锌层、锌铬涂层和真空渗锌/锌铬复合涂覆层的耐蚀性。结果表明,真空渗锌/锌铬复合涂覆层的耐腐蚀性能明显优于单独使用化学镀Ni–P合金镀层、真空渗锌层和锌铬涂层。     

Electrochemical and salt spray analysis of multilayer ormosil/conversion coating systems for the corrosion resistance of 2024-T3 aluminum alloys

The corrosion resistance characteristics of multilayer coating systems comprised of a conversion coating base layer and an organically modified silicate (ormosil) topcoat have been analyzed using salt spray and potentiodynamic polarization curve analyses. The effectiveness of the multilayer coating systems was found to depend on the presence of an electrochemically active species in the conversion coating and on the presence of a curing agent in the ormosil system. Multilayer coatings systems comprised of conversion coatings that contain active corrosion inhibitors were found to provide high degrees of corrosion protection. In all cases, the presence of the ormosil was found to enhance the corrosion resistance of the underlying conversion coating. The use of multilayer ormosil/conversion coating systems enhances the corrosion protection of 2024-T3 aluminum alloy by combining previously developed corrosion protection methods with emerging sol-gel technology. Environmental Institute, Stillwater, OK 74078.     

涂层防腐蚀的电化学研究

综述了国内外现行的涂层防腐蚀性能研究的电化学方法,说明了电化学方法评价涂层性能的一般规律和特点,指出电化学方法评价涂层性能具有快速、准确、方便的优点。     

新型涂料助剂——涂料缓蚀剂

本文提出了涂料缓蚀剂的概念，介绍了两种涂料缓蚀剂的特点、作用、应用情况，并提出应用涂料缓蚀剂对涂料涂装业的积极意义，最后指出了涂料缓蚀剂的应用与施工工艺的密切关系。     

高速动车组铝合金车辆的防腐蚀初探

根据制造高速动车组铝合金材料腐蚀的特点,以阻止和延缓腐蚀的产生为目标,设计结构充分考虑铝合金车体结构的防腐需要,同时表面处理采用不含铁的三氧化二铝材料进行喷砂,防腐底漆采用不含铁质颜料的双组分环氧底漆以及与之相配套的双组分油漆涂装保护体系对高速动车组车辆进行防腐涂装,为铝合金车辆的防腐蚀探索出了切实可行的措施,同时提供了标准的防腐涂装配套保护体系。     

Resistance of metallic substrates protected by an organic coating containing glass flakes

The resistance against corrosion of an epoxy-polyamine-based coating immersed in a 3 wt.% sodium chloride solution was investigated by electrochemical impedance spectroscopy (EIS). The organic coating contained glass flakes as pigment in order to enhance its barrier characteristics. The data show that this coating is more strongly adhered and exhibits higher protection characteristics when applied onto carbon steel substrates than on galvanized steel. Though the capacitance of the coating (C_C) does not show any appreciable variation with immersion time, the resistance (R_PO) of the film is observed to increase with time upon immersion. The analysis of the data sustains that the organic film behaves as a porous, non-barrier coating. Two time constants are observed even at earlier exposures, and the improved corrosion resistance developed after the coating system was exposed to the test electrolyte is considered to originate from the precipitation of corrosion products within the pores in the film.     

Electrochemical corrosion behaviour of plasma electrolytic oxidation coatings on AM50 magnesium alloy formed in silicate and phosphate based electrolytes

PEO coatings were produced on AM50 magnesium alloy by plasma electrolytic oxidation process in silicate and phosphate based electrolytes using a pulsed DC power source. The microstructure and composition of the PEO coatings were analyzed by scanning electron microscopy (SEM) and X-ray Diffraction (XRD). The corrosion resistance of the PEO coatings was evaluated using open circuit potential (OCP) measurements, potentiodynamic polarisation tests and electrochemical impedance spectroscopy (EIS) in 0.1 M NaCl solution. It was found that the electrolyte composition has a significant effect on the coating evolution and on the resulting coating characteristics, such as microstructure, composition, coating thickness, roughness and thus on the corrosion behaviour. The corrosion resistance of the PEO coating formed in silicate electrolyte was found to be superior to that formed in phosphate electrolyte in both the short-term and long-term electrochemical corrosion tests.     

Design of tailored biodegradable implants: The effect of voltage on electrodeposited calcium phosphate coatings on pure magnesium

Magnesium, as a biodegradable metal, offers great potential for use as a temporary implant material, which dissolves in the course of bone tissue healing. It can sufficiently support the bone and promote the bone healing process. However, the corrosion resistance of magnesium implants must be enhanced before its application in clinical practice. A promising approach of enhancing the corrosion resistance is deposition of bioactive coating, which can reduce the corrosion rate of the implants and promote bone healing. Therefore, a well-designed substrate-coating system allowing a good control of the degradation behavior is highly desirable for tailored implants for specific groups of patients with particular needs. In this contribution, the influence of coating formation conditions on the characteristics of potentiostatically electrodeposited CaP coatings on magnesium substrate was evaluated. Results showed that potential variation led to formation of coatings with the same chemical composition, but very different morphologies. Parameters that mostly influence the coating performance, such as the thickness, uniformity, deposits size, and orientation, varied from produced coating to coating. These characteristics of CaP coatings on magnesium were controlled by coating formation potential, and it was demonstrated that the electrodeposition could be a promising coating technique for production of tailored magnesium-CaP implants.     

Studies on fly ash based geopolymeric material for coating on mild steel by paint brush technique

The present work focuses on the study of five different compositions of fly ash based geopolymeric material with varying silicate: alkali ratio as coating material on mild steel plates. Coated mild steel plates were tested for adhesion strength, heat resistance, fire resistance, water absorption and corrosion resistance characteristics. Mineralogy, morphology and vibrations of various functional groups present in the developed coating material compositions were evaluated by X-ray diffraction analysis (XRD), scanning electron microscopy (SEM) and Fourier transform infra-red spectral studies (FTIR) respectively. The developed coating material possesses promising fire resistance, heat resistance, corrosion resistance characteristics and mechanical properties.