涂装前钢材表面处理系列国际标准综述(续)

介绍了涂装前钢材表面清洁度和表面粗糙度评估、表面处理方法以及喷射清理用磨料技术要求等相关系列国际标准。     

涂装前钢材表面处理系列国际标准综述

介绍了涂装前钢材表面清洁度和表面粗糙度评估、表面处理方法以及喷射清理用磨料技术要求等相关系列国际标准。     

低表面处理涂料的研究现状与发展前景

低表面处理涂料对底材表面处理要求低,可节省大量的表面处理费用。介绍了低表面处理涂料的作用原理、特点、种类和研究现状,分析了低表面处理涂料的发展前景以及目前国内存在的问题,认为经济、高效、环保的低表面处理涂料将是我国今后研究的热点。     

PVC表面装饰膜的应用进展

概述了本世纪初PVC表面装饰膜的发展现状,介绍了PVC表面装饰膜的特点、结构、性能要求、制备工艺和主要应用方法。     

浅谈陶瓷缺陷的审美

陶瓷生产历来都把制品的表面肌理和形态的完美无缺作为最终追求的目的。陶瓷生产制定有严格的技术指标和操作规范，泥料上最求高纯度、高细度和高白度；釉色上追求纯净、光洁、平整和细腻：装饰上尊崇高度理性、冷静的装饰规范，追求操作上的完善和造型上的规矩和严整等等。而对于制品表面的缺陷，即对于那些不符合技术要求的表面缺陷和变形的形体以及不符合规范要求的表面缺陷都加以否定和排斥。     

轨道车辆用碳纤维复合材料涂装工艺

介绍了碳纤维复合材料的水性涂料选型、表面处理、施工工艺和技术要求,总结了碳纤维复合材料水性透明涂层体系和水性复合涂层体系的施工参数.通过附着力试验证明了这2个体系的漆膜在碳纤维复合材料表面的附着力满足轨道车辆的使用要求.     

表面保护胶粘带

本文简介了表面保护膜的结构和性能要求、压敏胶的选择、基材的选择和处理、涂布工艺及表面保护膜的主要性能测试方法,列举了8种表面保护膜用压敏胶配方及其特性。     

表面活性剂的发展

分析了当前表面活性剂行业所面临的经济形势、法规和环境要求、原材料供应困境、应用技术挑战、市场的变化以及消费者的要求,并从生产技术、品种、价格以及应用等几方面对表面活性剂今后的发展状况做出预测。     

钢结构涂漆前表面预处理综述

表面预处理的重要性 钢结构表面上涂层系统的寿命与表面处理的质量直接有关，表面处理的质量越高，涂层的使用寿命就越长。因此，涂装设计规定的涂层系统就决定了表面预处理的方法和预处理的质量要求。换言之，在确定表面预处理方法时一定要充分了解涂层系统对表面预处理的要求。     

纳米粉体的表面改性研究进展

表面改性处理通过各种表面添加剂与纳米微粒表面发生化学反应和物理作用,改变微粒的表面状态,从而改善或改变粉体的分散性,改善耐久性、耐候性,提高表面活性,使纳米微粒表面产生新的物理、化学、光学特性,适应不同的应用要求,从而大大提高材料的附加值。文章主要介绍表面包覆改性、局部化学改性、机械化学改性、胶囊化改性、高能表面改性以及沉淀反应表面改性方法的研究进展。     

热喷涂设备的发展

热喷涂技术作为一种重要的表面处理技术,近年来发展很快.本文综述了热喷涂设备(包括等离子喷涂、高速火焰喷涂、爆炸喷涂等)近年来的发展情况.     

谈FRP模具表面金属化工艺

模具表面金属化是ＦＲＰ模具的发展趋势。本文详细介绍了表面喷涂金属制模的工艺技术。     

电刷镀热喷涂技术在化工设备检修中的应用

电刷镀热喷涂技术是设备检修工作中应用较广的零件表面修复技术,利用该技术对设备磨损零部件进行修复,可以有效降低备件库存,节约维修成本,减少停机损失,保障设备正常运转,经济效益可观。本文对我们在实际工作中的应用经验进行了总结,在此与大家共同交流。     

复合材料制件表面金属化技术——金属喷涂转移法

本文主要介绍了复合材料制件表面金属化的一种技术金属喷涂转移法。通过对金属喷涂转移法原理、载体膜成型工艺和金属喷涂工艺等的研究,成功地实现了大型复合材料制件的表面金属化     

低能耗低污染复合结构陶瓷材料表面喷涂工艺研究

传统的装备表面修复技术对设备要求高,并且操作复杂、技术难度大、能耗高、防腐性能差,同时,传统工艺含有挥发性有机物和有害空气污染物,不适应生态及环保要求,为此开发水性纳米结构陶瓷耐高温重防腐涂料,重点介绍了水性纳米结构陶瓷耐高温重防腐涂料的喷涂工艺及其涂层特性。     

Preparation and properties of a simple super-hydrophobic carbon fiber composite surface

Super-hydrophobic surface is widely used in waterproof, antifouling, and anticorrosion fields because of its unique wetting characteristics. However, the rough structure of super-hydrophobic surface is easily damaged in service, which leads to the loss of various properties, making it difficult to apply super-hydrophobic surface on a large scale in actual production. In this paper, epoxy resin was used as adhesive, mixed with hydrophobic silica particles and sprayed on the surface of carbon fiber composites. After curing, the surface of super-hydrophobic carbon fiber composites with contact angle of 158 ± 2° and sliding angle of 1 ± 0.5° was formed. The surface had excellent dynamic water repellent performance, and the droplets could bounce more than three times on the surface. Furthermore, the super-hydrophobic surface had excellent wear resistance and mechanical stability. After the friction damage test, the surface structure of the sample was slightly damaged. The amount of wear was small, and the surface was still in super-hydrophobic state. Through soaked in solutions with different pH values, the microstructure of the surface was not obviously damaged by corrosion, the contact angle of water droplets was greater than 155°. The preparation method of super-hydrophobic surface of carbon fiber composite proposed in this study is simple and rapid, and the prepared surface has excellent performance, the practical application of super-hydrophobic surface is promoted.     

Application of plasma spraying in the preparation of metal-supported catalysts

Catalysts supported on metals are widely used today, but room still remains for further improvement of catalyst characteristics. The subject of this paper is the application of a plasma spray for the deposition of alumina coatings on metal substrates of different geometry (plates, foams) for subsequent synthesis of catalysts. The alumina layer sprayed successfully solves two different problems: (i) it serves as a washcoat on which a catalyst is synthesized, and (ii) it protects the metal surface from oxidation at high temperatures.     

Preparation of superhydrophobic conductive micro/nano-graphite/PDMS films on paper by simple spraying method

Paper-based materials are widely used in various fields due to their advantages, such as environmental friendliness and sustainability. However, the highly hydrophilic nature of the cellulose that makes up paper-based materials limits their use. In this paper, micron/nano-graphite/polydimethylsiloxane (PDMS) coatings with excellent superhydrophobic and conductive properties were prepared on the surface of filter paper by a simple spraying method. A mixture of micro-graphite and nano-graphite was used to form a multistage rough structure on the surface of the filter paper by spraying, and the low surface energy PDMS enhanced the adhesion of the micro-graphite and nano-graphite on the surface of the filter paper. The results showed that the samples possessed the best superhydrophobic properties when the ratio of micro-graphite to nano-graphite was 1:1, at which time the contact and rolling angles of the samples were 165.4° and 3.2°, respectively. The prepared superhydrophobic samples have good bounce and self-cleaning properties, while the samples have good mechanical stability and chemical resistance. Additionally, due to the conductivity of micro–nano-graphite, both particle sizes closely contact the sample surface, creating a conductive network. With a 1:1 ratio of micro- and nano-graphite, the coating exhibits minimal resistance at 1.89 KΩ, and the sample maintains stable conductivity even underwater. The above properties greatly extend the application range of paper-based superhydrophobic materials.     

Characterization and corrosion behavior of plasma sprayed calcium silicate reinforced hydroxyapatite composite coatings for medical implant applications

Titanium and its alloys are widely used for medical implant applications, but their corrosion in the physiological environment leads to the discharge of metal ions, which can trigger severe health issues. In the present study, calcium silicate reinforced hydroxyapatite (HA-CS) coatings were deposited on the Ti6Al4V substrate by using atmospheric plasma spray (APS) process with an aim to improve the corrosion resistance and bioactivity. The coatings were prepared by varying the weight percentage (wt %) of calcium silicate (CS) reinforcement in hydroxyapatite (HA) as Ha/x CS (x = 0, 10, 20 wt %). The SEM analysis of the pure HA coating revealed the presence of surface microcracks, whereas HA-CS coatings displayed the crack-free surface morphology. The corrosion investigation revealed that with the progressive increment of CS content in HA coating, the corrosion resistance of HA-CS coatings improved. In addition, surface roughness, porosity, microhardness and crystallinity increased with the increase of CS content in HA. The findings of this study indicate that the development of plasma sprayed HA-CS coatings is a promising approach to improve the performance of Ti6Al4V alloy for medical implant applications.     

Ferrochromium slag as a protective coating material against oxidation for caster rolls

In this study, ferrochromium (FeCr) slag, which is available as an industrial waste, is proposed as a protective surface coating material particularly for protection of continuous casting rolls against oxidation. FeCr slag was successfully deposited with atmospheric plasma spray (APS) method. Before the coating process, FeCr slag powder prepared in the particle size range of 5‐38 μm, was investigated using conventional characterization methods (XRD, SEM, TGA etc.). Thermal Barrier Coating (TBC) system was used as a basis for deposition processes. Accordingly, NiCoCrAlY (Amdry, ?45 + 5 μm) was firstly deposited as metallic bond coat layer onto the surface of AISI 420 substrate, and then FeCr slag layer was deposited as the top coating layer. After the deposition of FeCr slag powder, the resulting coating layer was found to have low porosity with a homogeneous microstructure. The deposited FeCr slag coatings were subjected to isothermal oxidation tests at different temperatures and test durations for determination of their oxidation behavior and upper operating temperature limits. The results obtained from this study indicate that FeCr slag can be considered as an alternative protective coating material for caster rolls which are subjected to high temperatures up to 800°C.