超憎水SiO2/FEVE复合涂层的制备

目的制备超憎水SiO_2/FEVE复合涂层。方法使用物理混合方式将SiO_2填料加入到成膜物FEVE树脂中,制得超憎水涂料,并通过雾化喷涂在玻璃片上形成超憎水涂层。通过指触法测量了涂层的表干时间,利用接触角测量仪、扫描电镜以及原子力显微镜检测了超憎水SiO_2/FEVE复合涂层的憎水性能与微观形貌,并利用划格法评价了涂层的附着力。结果根据溶解度参数相近以及环保性原则选用了乙酸乙酯与乙酸丁酯的混合溶剂,最终得出超憎水SiO_2/FEVE复合涂料的配方为:100 g FEVE树脂、135 g乙酸乙酯、90 g乙酸丁酯、25 g D-SiO_2、10.5 g HDI。涂料配制完成后,采用大雾化量与大流量结合的喷涂工艺便可完成SiO_2/FEVE超憎水涂层的制备。涂层形成了含有内嵌孔洞的珊瑚状结构,表面呈现为规律交替分布的突起和凹陷区构成的粗糙结构,接触角可达152.8°,滚动角为8°。结论调整溶剂种类与固化剂加入量并未对涂层的结合力或成膜性有所改善,填料比例是影响涂层成膜性与憎水性能的关键工艺参数。涂层表面有序分布的微纳米级凹凸结构形成了超憎水表面所需有效的表面微观粗糙结构,这是涂层具有优良憎水性能的主要原因。     

飞机外部 IMR21 纳米复合涂层在典型加速腐蚀环境中的腐蚀失效行为

目的研究IMR纳米复合涂层对飞机外部结构件的防护性能。方法对比考察典型加速腐蚀环境条件下,飞机外部结构模拟件表面聚氨酯面漆涂层和IMR21纳米复合涂层的腐蚀失效行为。结果在经过2个阶段各8个周期的加速腐蚀后,模拟件涂层表面均出现了鼓包、开裂、剥落等现象,而且涂层在第二阶段的腐蚀程度略重于第一阶段。与聚氨酯面漆涂层相比,IMR21纳米复合涂层的腐蚀失效程度要低很多,说明该纳米复合涂层具有优良的抗环境腐蚀性能。结论可考虑在飞机结构制造、大修以及外场维护中采用IMR21纳米复合涂层进行表面防腐涂装处理。     

纳米复合氟碳涂料的性能研究

利用紫外线老化试验、电化学交流阻抗试验和盐雾试验对普通氟碳涂层和纳米复合氟碳涂层的性能进行了对比研究.结果表明，与普通氟碳涂层相比，纳米复合氟碳涂层的耐紫外老化性能良好，其色差值ΔE可降低23%；纳米复合氟碳涂层体系的电阻值提高一个数量级以上；耐盐雾腐蚀性能有显著改善.      

三种导电防腐涂层的耐蚀性能研究

分别制备聚苯胺改性石墨烯、纳米粒子改性石墨烯和石墨/炭黑复合物三种导电防腐涂料,并将其分别涂覆在Q235钢表面制备导电防腐涂层接地材料。采用接触角仪、电化学阻抗谱、Tafel极化曲线和光学显微镜,研究了该上述涂层在酸性土壤模拟液中的腐蚀性能。结果表明:三种导电防腐涂层均具有优良的防腐性能和较大的接触角。纳米粒子改性石墨烯涂层和聚苯胺改性石墨烯涂层防腐效果大于石墨/炭黑复合导电涂层。纳米粒子改性石墨烯涂层和聚苯胺改性石墨烯涂层的保护效率分别高达92.09%和91.44%。     

氮化钛含量对热塑性涂层光热效应及自修复性能的影响

为了实现涂层破损的高效自修复,将纳米氮化钛与热塑性聚氨酯混合,制备了不同氮化钛含量的复合涂层。 利用扫描电子显微镜(SEM)、X 射线衍射仪(XRD)和紫外可见分光光度计(UV-Vis)分析了氮化钛的结构和光谱吸收特征;利用差示扫描量热仪(DSC)、热电偶、光学显微镜、扫描电子显微镜( SEM)、交流阻抗谱(EIS)等对复合涂层的热力学性能、光热转换性能、自修复性能及防腐性能进行测试。 结果表明:基于纳米氮化钛的表面等离激元特性,在热塑性聚氨酯中添加质量分数为 2%的氮化钛后,复合涂层具有良好的光热转换性能,在近红外激光照射后其表面温度高于聚氨酯的玻璃化转变温度。 当涂层表面有划口时,通过激光照射可以提高涂层的局部温度,使聚合物分子链运动并流向划痕界面,复合涂层的结构和防腐性能均得到恢复,并且修复后涂层中氮化钛仍分布均匀。 此外,氮化钛纳米颗粒还有助于填补涂层的微观孔隙,使复合涂层的防腐性能提高。     

铝基非晶纳米晶复合涂层研究

采用自动化高速电弧喷涂系统,用自行研制的粉芯丝材,在AZ91镁合金基体表面上制备出Al-Ni-Y-Co非晶纳米晶复合涂层.采用扫描电子显微镜(SEM)、X射线衍射仪(XRD)、透射电子显微镜(TEM)分析了Al-Ni-Y-Co非晶纳米晶复合涂层的微观形貌和组织结构,结果表明Al-Ni-Y-Co非晶纳米晶复合涂层是由非晶相和纳米晶化相共同组成的,涂层结构致密,孔隙率约为1.8%.Al-Ni-Y-Co非晶纳米晶复合涂层的平均显微Vickers硬度值为311.7 HV0 1,结合强度为26.8 MPa.涂层的抗磨损耐腐蚀性能优于Al涂层和AZ91镁合金基体;其相对耐磨性约为Al涂层的10倍,为AZ91镁合金的6倍;其自腐蚀电位值正于Al涂层及AZ91镁合金,自腐蚀电流密度值约为Al涂层的1/2,AZ91镁合金的1/5;其腐蚀后的表面形貌比Al涂层和AZ91镁合金平整,点蚀较少.Al-Ni-Y-Co非晶纳米晶复合涂层的耐磨防腐综合性能优异.     

等离子增强磁控溅射技术与纳米复合结构涂层

本文介绍了等离子增强磁控溅射技术（PEMS）的基本原理,以及利用该技术所开发的纳米复合结构涂层,这种涂层的微观结构为纳米颗粒的复合材料—TiSiCN涂层,该涂层具有非常高的表面硬度,具有极好的防腐耐磨性能,同时该涂层的厚度可达560μm,且具有非常好的附着力和柔韧性,不易从基材脱落及脆裂。利用等离子增强磁控溅射技术沉积的纳米复合结构涂层性能良好,具有非常广泛的应用前景。     

纳米二氧化钛硅烷接枝密度对水性环氧涂层耐蚀性能的影响

目的研究水性环氧/硅烷化纳米TiO2复合防护涂层在3.5%NaCl溶液中的失效规律和防腐性能。方法采用3-氨丙基三乙氧基硅烷(APTES)化学接枝改性纳米TiO2颗粒,将硅烷改性纳米TiO2均匀分散在水性环氧涂料中,并把混合涂料涂覆在Q235钢试样上。采用傅里叶红外光谱仪(FTIR)和热重分析仪(TGA)测试纳米TiO2表面化学接枝改性情况,采用电化学工作站测试复合涂层的电化学性能,采用激光共聚焦显微镜观察复合膜层的表面形貌。结果使用质量分数10%APTES改性纳米TiO2,单齿螺旋结构占有的比例更高;使用质量分数20%APTES改性纳米TiO2,具有最高的接枝密度,为11.78 APTES/nm^2。电化学测试结果显示,环氧/TiO2复合涂层比纯环氧涂层具有更好的耐蚀性能,其中加入质量分数20%APTES改性纳米TiO2的环氧/TiO2复合涂层对基体的保护性能最好,其涂层电阻是纯环氧涂层的12倍,电荷转移电阻是纯环氧涂层的18倍。在相同的腐蚀条件下,单齿螺旋结构更容易被破坏。加入硅烷纳米TiO2颗粒后,可以显著减少涂层表面尖峰状突起和孔洞。结论纳米TiO2的APTES接枝分子密度,是水性环氧/硅烷化纳米TiO2复合防护涂层耐腐蚀性能提高的直接原因。     

PPS/SiO2纳米复合涂层抗冲蚀磨损特性研究

采用了附着力测定仪、冲击试验器、冲蚀磨损试验机等手段，对钠米复合涂层、普通涂层的附着力、耐冲击性和抗冲蚀磨损性能进行了研究。探讨了无机物颗粒形态和尺度等因素对两种涂层抗冲蚀磨损性能的影响。结果表明，由于纳米粒子的增强、增韧效果明显，使得纳米复合涂层比普通涂层具有更好的抗冲蚀磨损性能。     

超音速等离子喷涂WC/Co纳米结构涂层性能研究

采用超音速等离子喷涂设备分别制备了含纳米结构和普通结构的WC／Co涂层。研究了2种涂层的结合强度、显微硬度和摩擦磨损性能，并用扫描电镜(SEM)和透射电镜(TEM)对涂层喂料(纳米WC／Co粉体)、涂层表面形貌和晶粒结构进行了分析。结果表明：含纳米结构涂层的性能优于普通的WC／Co喷涂涂层，纳米晶粒细晶强化是涂层性能提高的主要原因。     

Ni-TiO2基纳米复合电刷镀层微观结构及腐蚀电化学行为

研究了用电刷镀在Q235钢上制备出Ni-TiO2纳米复合镀层复合镀液中,纳米颗粒的加入量及不同的表面活性剂对镀层性能的影响。采用SEM对复合镀层的表面形貌进行分析,用极化曲线研究了纳米复合镀层在NaCl溶液中的腐蚀电化学行为,结果表明:与纯Ni镀层相比,Ni-TiO2纳米复合镀层晶粒更加细小,空隙率更低,阳离子表面活性剂分散镀液所得镀层效果最为显著;复合镀液中纳米TiO2质量浓度为10g/L时,复合镀层的耐腐蚀性能最优;纳米颗粒含量相等的情况下,阳离子表面活性剂分散镀液所得镀层具有最好的耐腐蚀性能。     

Wettability and Corrosion Behavior of Chemically Modified Plasma Electrolytic Oxidation Nanocomposite Coating

The aim of this paper was to investigate the effect of potassium stearate on the wettability behavior, corrosion resistance, roughness and thickness of reinforced and unreinforced plasma electrolytic oxidation (PEO) coatings with Si₃N₄ nanopowders. Morphological characteristic, corrosion behavior and wetting properties of the coatings were evaluated using SEM, cyclic polarization and Wilhelmy plate method, respectively. In order to obtain a better evaluation of the contact angle, roughness of the coatings was studied by AFM. The results indicated that the nanocomposite hydrophobic coatings have the best corrosion resistance. Potassium stearate could repel water from the holes of coating by reacting with aluminum and producing aluminum stearate. The contact angle of nanocomposite and normal PEO coatings was increased up to 65° due to the addition of potassium stearate. This additive could also increase the hysteresis contact angle up to 51°.     

Effect of polyaniline–montmorillonite nanocomposite powders addition on corrosion performance of epoxy coatings on Al 5000

A series of polyaniline (PANI)/montmorillonite (MMT) nanocomposite materials has been successfully prepared by in-situ emulsion polymerization in the presence of inorganic nanolayers of clay with camphorsulfonic acid (CSA) and ammonium peroxydisulfate (APS) as surfactant and initiator, respectively. The nanocomposite materials were characterized by Fourier Transformation Infrared (FTIR) spectroscopy, X-ray diffraction (XRD) and scanning electron microscopy (SEM). Epoxy resin was used as a binder for the nanocomposites in order to obtain a thick and uniform coating. In order to understand the effect of MMT and PANI on the corrosion inhibition performance of the epoxy coatings in 3.5% saline solution at 65 °C, the epoxy (E), epoxy blend with polyaniline (EP), epoxy blend with polyaniline and MMT (EPM) coatings were investigated by electrochemical impedance spectroscopy (EIS). The results showed that EPM coatings with 5% clay on pretreated aluminum by anodizing were much superior in corrosion protection, with respect to the other samples. Incorporation of PACN nanocomposites inside the epoxy significantly increases the resistance of the coating in comparison to the other coatings in 3.5% saline solution at 65 °C. These phenomena can be attributed to specific morphology of the nanocomposite.     

Microstructure and Mechanical Properties of Thermally sprayed silica/nylon nanocomposites

High-velocity oxyfuel thermal spray processing was used to produce ceramic/polymer (silica/nylon) nanocomposite coatings. By optimizing spray parameters such as nozzle design, spray distance, oxygen-to-fuel ratio, powder feed position, and substrate cooling, dense coatings with relatively uniform particulate distribution could be achieved. Compared to pure nylon coatings, scratch resistance improved by 30 % and wear resistance by 50 %. The surface chemistry of the silica filler affected the final coating properties. Silica particles with a hydrophobic (methylated) surface resulted in better mechanical properties than those with a hydrophilic (hydroxylated) surface.     

The effect of TiO2 nanoparticle codeposition on microstructure and corrosion resistance of electroless Ni?P coating

Ni? P? TiO₂ nanocomposite coatings with various contents of TiO₂ nanoparticles were synthesized by adding TiO₂ nanoparticles to Ni? P electroless plating solution. The effects of pH and anionic surfactant sodium dodecyl sulfate (SDS) on the chemical composition of Ni, P, and TiO₂ in the coatings were investigated. Scanning electron microscope (SEM), energy dispersive spectrometer (EDX), and X‐ray diffractometer (XRD) were used to characterize the morphology, composition, and crystal structure of deposited coatings, respectively. The hardness of nanocomposite coatings was improved greatly compared to Ni? P coating especially after heat treatment. After heat treatment at 400 °C for 1 h, an increase in microhardness was observed for heat‐treated Ni? P coatings. The hardness was increased from 805 to 1050 Hv for Ni? P? TiO₂ coating deposited at 9 g/LTiO₂ concentration in the bath. The corrosion resistance of Ni? P? TiO₂ coating was significantly increased compared to Ni? P coatings by incorporation of TiO₂ nanoparticle.     

无铬纳米锌铝涂层的微观组织及腐蚀性能

向无铬锌铝涂层中分别加入3种纳米微粒ZnO,TiO₂和SiO₂制备纳米复合涂层,通过盐水浸泡实验和电化学测试研究其耐蚀性,结合SEM等手段观察纳米复合涂层显微组织及其在盐水中的腐蚀情况,分析纳米微粒在涂层中所起作用。结果表明,3种纳米微粒的加入能够加强涂层的阴极保护作用,并能延缓涂层金属粉末的消耗,较无铬锌铝涂层更易减慢腐蚀速率。其中,纳米SiO₂复合涂层耐蚀性最佳,纳米TiO₂复合涂层略次,ZnO纳米复合涂层耐蚀效果较差,3种纳米复合涂层耐蚀性均优于无铬锌铝涂层。     

The effect of nanoporous silica aerogel on corrosion protection properties of epoxy coatings on carbon steel

In this paper, due to special properties of aerogels such as ultra-low density and hydrophobic nature of aerogels, this nanomaterial was used as anticorrosive pigments. Silica aerogel was dispersed in epoxy resin by using sonication method. The dispersion of nanoparticles were characterized by transmission electron microscopy. The anticorrosive properties of these coatings were investigated by salt-spray and electrochemical impedance spectroscopy methods in a 3.5 wt % NaCl solution. Impedance parameters showed a decrease in coating resistance over immersion time. Results indicated that epoxy coatings containing nano silica aerogel could significantly increase the corrosion resistance of composite coatings compared to those of pure epoxy and the highest value was obtained for 0.5% aerogel nanocomposite coatings after 160 days immersion. Pull off adhesion test showed the highest value of adhesion was related to coating containing 0.5% aerogel. According to salt-spray methods, it was found that the best results were obtained with coatings containing 0.5 and 1 wt % of silica aerogel.     

氟改性和硅改性丙烯酸聚氨酯涂层的制备及环境行为

目的研究氟改性和硅改性丙烯酸聚氨酯涂层在不同环境中的失效行为。方法通过溶液聚合法制备具有一定羟基含量的丙烯酸酯树脂,再将丙烯酸树脂与多异腈酸酯固化剂配合,获得丙烯酸聚氨酯涂层。通过在丙烯酸酯合成中引入含氟丙烯酸酯单体,制得氟改性丙烯酸聚氨酯涂层;通过在固化过程中引入氨基硅油,制得硅改性丙烯酸聚氨酯涂层。利用傅里叶变换红外光谱(FT-IR)分析涂层的化学组成。对涂层试样进行温度环境实验(室温和100,150℃)、湿热环境实验和氙灯老化实验,分析涂层疏水性、光泽度等表面特性的变化。结果氟、硅改性有效提高了涂层的疏水性。未改性、氟改性和硅改性三种涂层在100℃以下的环境中服役时,疏水性和光泽度比较稳定。硅改性涂层在150℃的高温环境中较未改性和氟改性涂层失效慢。湿热环境对三种涂层的接触角和光泽度等性能影响不大。氟改性涂层在氙灯老化环境中的失效程度较另外两种涂层轻。结论氟改性涂层耐光老化性能较好,硅改性涂层耐温性较好。     

超声电沉积制备Ni-ZrO2纳米复合镀层及其结构和性能的研究

制备了纯Ni镀层和Ni-ZrO2纳米复合镀层,并在沉积过程中引入超声波制备了超声Ni-ZrO2纳米复合镀层,对比分析了3种镀层的微观结构及高温抗氧化性、显微硬度、耐磨性。结果表明,超声电沉积Ni-ZrO2纳米复合镀层晶粒尺寸细小,具有良好的高温抗氧化性能、高的显微硬度和优良的耐磨性,并进一步分析了纳米颗粒和超声波在提高镀层性能方面所起的作用。     

Investigation of wear and corrosion resistance of nanocomposite coating formed on AZ31B Mg alloy by plasma electrolytic oxidation

Ceramic-WC coatings were prepared on AZ31 B Mg alloy by plasma electrolytic oxidation (PEO) from a phosphate based bath containing suspended tungsten carbide nanoparticles at various process times. Scanning electron microscope results indicated that increase of coating time and incorporation of tungsten carbide into the ceramic coating during the PEO process led to a decrease in the number and diameter of coating pores. Phase analysis showed that the nanocomposite coating was composed of MgO, Mg₃(PO₄)₂ and WC. Tribological properties and corrosion behaviour of uncoated AZ31 B Mg alloy and ceramic coatings were evaluated using a pin-on-disc tribometer and potentiodynamic polarisation technique in 3.5% NaCl solution, respectively. The wear and electrochemical tests showed that wear and corrosion resistance of ceramic-WC nanocomposite coatings were better than ceramic only ones. In addition, wear and corrosion behaviour of coatings improved with increasing the coating time.