中空二氧化硅微球包覆2-巯基苯并噻唑自修复涂层防腐性能

涂层技术广泛应用于金属设备腐蚀防护,而针对传统涂层服役过程中的微损伤难以及时探测并修复,导致损伤后涂层防腐性能失效、金属腐蚀进程加速等问题。开发一种中空介孔SiO₂微球包覆2-巯基苯并噻唑的自修复涂层,并对涂层的自修复性能进行全面表征测试。将包覆2-巯基苯并噻唑的SiO₂微球作为填料,添加到无溶剂环氧树脂涂层中制备自修复涂层,在质量分数为3.5%的NaCl溶液中探查受损涂层在铜基体表面的自修复过程。采用多种测试表征方法测试SiO₂微球包覆2-巯基苯并噻唑的可行性,对涂层的自修复机理进行深入分析,综合评价自修复涂层的防腐性能。采用溶胶-凝胶法对SiO₂微球进行制备,制备的SiO₂微球具有中空结构,微球直径约为623nm。通过XDR、FTIR与TG等测试表征技术验证SiO₂微球实现对2-巯基苯并噻唑的包覆,且负载量良好;通过EIS阻抗测试对自修复涂层的修复性能进行测试,经对照实验测试自修复涂层具有较为良好的防腐性能,并在6d时防腐性能达到最大;通过SEM、ED...     

负载植酸钠的壳聚糖微球改性水性涂层制备及防腐蚀性能研究

目的将负载缓蚀剂植酸钠的多孔壳聚糖微球添加到水性聚丙烯酸涂层中,研究涂层改性后的防腐蚀性能。方法利用油包水(W/O)乳化固化法制备壳聚糖微球,通过扫描电子显微镜(SEM)、傅里叶变换红外光谱(FT-IR)、X射线衍射(XRD)研究微球的形貌性征。利用负压-浸渍法将缓蚀剂植酸钠负载到壳聚糖微球中,并利用热重分析(TGA)研究缓蚀剂的负载率。将负载缓蚀剂的微球按照质量分数5%添加到水性涂层中,利用电化学阻抗谱(EIS)研究涂层改性后的防腐蚀性能。结果 SEM图像表明,壳聚糖微球成球性良好,粒径为20~30μm。FT-IR及XRD结果表明,交联剂香草醛通过希夫碱反应以及氢键作用对壳聚糖进行交联,使得壳聚糖微球固化,并且结晶度降低。TGA结果表明,缓蚀剂植酸钠的负载率为25.79%。EIS结果表明,经负载缓蚀剂的壳聚糖微球改性后的水性聚丙烯酸涂层电荷转移电阻增加。结论水性聚丙烯酸涂层中的多孔壳聚糖控制植酸钠的释放,提高了缓蚀剂的利用率,改性后的涂层防腐蚀性能得到了提高。     

仿生自修复环氧树脂涂层制备及性能

采用一步原位聚合法制备了脲醛树脂包覆E-51/711微胶囊,观察微胶囊形貌呈球形,为单核结构,表面致密,粒径大小分布为25～375μm。模仿生物组织损伤自愈合原理,将微胶囊引入环氧树脂涂层结构中,设计了潜伏型微胶囊自修复环氧涂层。对不同微胶囊质量分数(5%,10%,15%,20%)的环氧自修复涂层的力学性能进行测试分析,结果表明:随着微胶囊的添加量增大,涂层的冲击强度、附着力级别和巴尔霍兹硬度不断降低,而适量添加微胶囊可提高涂层的附着力。对微胶囊环氧树脂涂料块体试样进行拉伸断裂测试试验,并对涂层进行预置划痕修复试验,结果表明:少量添加微胶囊对涂层起到了一定增韧作用,含微胶囊自修复体系的涂层在受到损伤时能够释放修复剂,填充修复损伤部位。     

光热自修复涂层的研究进展

综述了光热触发自修复涂层的结构设计与修复机制、填料的种类及其特点、涂层的修复效率与防腐应用,重点阐述了基于碳基填料、等离激元纳米材料、有机填料、四氧化三铁纳米颗粒等光热响应物质自修复涂层的国内外最新研究进展,详细分析了填料含量、光照波长、光照强度、基体类型等对涂层的自修复性能和耐蚀性能的影响规律。最后,提出了光热自修复涂层目前存在的问题以及发展前景,未来应进一步优化涂层的制备工艺,提升光热转换效率,降低制备成本,并将涂层的多重修复机制相结合,共同提升涂层的长效防护能力,使之早日实现工业应用。     

含环氧树脂微胶囊自修复涂层的制备及其性能

目的制备含环氧树脂微胶囊的二元自修复涂层,并对其力学性能和自修复性能进行研究。方法将自制环氧树脂E-51/三聚氰胺-脲醛树脂微胶囊和潜伏型固化剂(2-甲基咪唑)按一定比例添加到环氧树脂基体中,制备二元自修复环氧树脂涂层。利用漆膜弹性试验机、漆膜冲击试验机和万能拉伸试验机对涂层的弯曲性能、耐冲击性能和拉伸性能进行测试。利用扫描电子显微镜(SEM)、光学显微镜(OM)对涂层的自修复性能进行考察。采用EIS对涂层的电化学性能进行测试。结果成功制备了含环氧树脂微胶囊二元自修复涂层,当涂层中微胶囊的质量分数为3%时,涂层的冲击强度和拉伸强度分别提高了10.6%和14.6%。当涂层中2-甲基咪唑和微胶囊质量分数分别为6%和5%时,涂层的自修复性能较佳。当微胶囊质量分数为9%时,涂层的电化学阻抗值可达1.2×105?。结论微胶囊的加入可有效提高涂层的冲击强度和拉伸强度。随着涂层中潜伏型固化剂含量的增大,涂层的自修复性能增强。当潜伏型固化剂含量达到一定值时,涂层的自修复性能随着微胶囊含量的增大而增强。随着微胶囊含量的增加,涂层的电化学阻抗值增大。     

自相似双层结构自修复超疏水涂层的制备及性能

目的 研究自修复超疏水复合涂层的制备工艺及自修复性能.方法 将环氧树脂、中性硅酮胶和疏水纳米SiO2混合制得涂料底层,纳米SiO2与无水乙醇混合得到涂料面层,采用两步浸涂法在载玻片表面制备出具有自修复功能的自相似双层超疏水涂层.利用扫描电子显微镜、傅里叶变换红外光谱仪和接触角测量仪,对复合涂层的微观形貌、分子结构和润湿...     

碳钢基自修复涂层的制备和耐蚀性研究

目的 通过在有机防腐涂层中添加小粒径的自修复微胶囊,增强防腐涂层的自修复能力,提高碳钢的耐腐蚀性能.方法 通过乳液聚合法,采用桐油和金属缓蚀剂作为囊芯,分别合成得到了粒径均一的单组分和双组分自修复胶囊,均匀分散于防腐涂层中,获得自修复涂层.结果 SEM和热重分析显示,合成的单组分和双组分自修复微胶囊的平均粒径在3μm左右,囊芯包覆率分别达到48％和49％.人为破损涂层的中性盐雾试验和浸泡试验表明,在囊芯中桐油和金属缓蚀剂的比例为5:1且防腐涂层中微胶囊含量为10％的条件下,经历110 h中性盐雾试验后,防腐涂层划痕处仍旧保持完整,未出现鼓泡和腐蚀现象.同时,浸泡675 h后,自修复涂层仍然保持较高的低频阻抗模值,表明此时涂层的耐蚀性最佳.结论 含有双组分微胶囊的自修复涂层具有较好的自修复能力,可以较好地阻碍腐蚀环境侵蚀,起到长期保护金属基体材料的作用.     

微波水热法自组装制备纳米TiO2微球

采用微波水热法,以TiCl3为前驱物,NaCl为矿化剂,添加CTAB作为表面活性剂,在170℃下反应2h,制备出了纳米TiO2微球,用X射线衍射和扫描电镜对微球的晶型与形貌进行研究.结果表明,微球为金红石型,直径为2～3μm,微球由纳米棒组装而成,纳米棒直径为50nm,长度为500 nm.     

微球构筑防污减阻涂层的制备

通过乳液聚合法制备表面具有聚乙二醇（PEG）支链的聚苯乙烯微球,将所得微球悬浮液与丙烯酸酯聚合物乳液共混,采用涂覆的方式制备仿生减阻涂层。考察微球的组成及其粒度、不同微球含量对涂层表面形貌及润湿性的影响,研究交联对涂层稳定性的影响。采用异硫氰酸荧光素标记的牛血清蛋白（BSA-FITC）考察不同微球含量对涂层抗蛋白吸附性的影响,运用扭矩测定法考察了涂层的减阻性能。结果表明：具有PEG支链的聚苯乙烯微球粒径具有单分散性,所得仿生涂层表面分布着大量的聚合物微球,且随着微球质量分数增大,涂层水接触角减小、亲水性增强;交联反应显著改善涂层的耐水稳定性;与未添加微球的涂层相比,当微球质量分数为15%时,涂层的抗蛋白吸附效率最大可达到97%,当微球质量分数为6%时,涂层的减阻率最大可达到21%。     

微胶囊填充型自修复涂层材料研究进展

微胶囊填充型自修复聚合物及其复合材料是近年来高分子科学界的研究热点之一.总结了微胶囊填充型自修复涂层的修复机理.概括了常见的微胶囊填充型自修复涂层体系,包括双环戊二烯-Grubbs固化剂体系、环氧树脂固化剂体系以及极性溶剂-环氧树脂体系等,并对各体系的组成、微胶囊的稳定性及其影响因素、当前研究现状及未来发展前景进行了总结.介绍了常见的微胶囊制备方法,其中主要有原位聚合法和界面聚合法,并对各方法的原理、特点、应用范围及自身优缺点进行了介绍.对微胶囊填充型自修复涂层的性能(包括力学性能和耐蚀性能)评价方法进行了总结.自修复微胶囊的加入使涂层的断裂韧性修复效率超过90％,微胶囊使涂层层间附着力的修复效率达到87％.电化学实验可以从腐蚀电流和阻抗方面等证明微胶囊填充型自修复涂层比普通涂层具有更好的耐蚀性能,同时利用电化学实验也可以对微胶囊填充型自修复涂层的修复过程进行解释说明.最后对微胶囊填充型自修复涂层材料在不同领域的应用进行了总结,并针对微胶囊填充型自修复涂层材料未来的发展方向进行了展望.     

Improvement in corrosion resistance of magnesium coating with cerium treatment

Corrosion protection afforded by a magnesium coating treated in cerium salt solution on steel substrate was investigated using open circuit potential, polarization curves, and electrochemical impedance spectroscopy (EIS) in 0.005 M sodium chloride solution (NaCl). The morphology of the surface was characterized by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), and X-ray diffraction (XRD). The cerium treated coating was obtained by immersion in CeCl3 solution. The results showed that the corrosion resistance of the treated magnesium coating was improved. The corrosion potential of the treated coating was found to be nobler than that of the untreated magnesium coating and the corrosion current decreased significantly. Impedance results showed that the cerium treatment increased corrosion protection. The improvement of anti-corrosion properties was ataibuted to the formation of cerium oxides and hydroxides that gave to a physical barrier effect.     

The effects of a CeO2 coating on the corrosion parameters of type 304 stainless steel

Coatings of CeO₂ derived from inorganic sol-gel dispersions were applied to type 304 bright annealed stainless steel (British Standard 1449 type 304S31) coupons and subjected to heat treatments at 450 and 550 °C. The coatings, 0.5 μm thick, were transparent, adherent, and stable. The aqueous corrosion properties of the coated coupons in 1 molar NaCl were then studied by potentiodynamic polarization measurements and electrochemical impedance spectroscopy. The derived corrosion parameters were then compared with similarly heat-treated, uncoated 304SS coupons. The results indicate that the application of a CeO₂ coating, heat treated at 550 °C, improves the corrosion rate as compared to an uncoated heat-treated coupon. The polarization curve for the 450 °C heat-treated, coated coupon showed passive behavior compared to transpassive for the uncoated specimen. The impedance spectrum data for the uncoated, as-received coupon could be modeled using a resistor in series with a parallel capacitor resistor combination “Randles” equivalent circuit. A coated coupon, heat treated at 550 °C, could be modeled using a more complex equivalent circuit involving a constant phase element, due to the CeO₂ coating. Modeling of the impedance characteristics for the oxidized coupons required the addition of a second series element consisting of a parallel resistor capacitor combination to give a Chi square statistic fit of X² < 5 X 10^-4.     

镍基非晶合金涂层的制备与腐蚀性能

用气体雾化法制备了Ni53Nb20Ti10Zr6Co6Cu3非晶合金粉末,将粒度小于25μm的非晶粉末用动力金属喷涂工艺制备了非晶涂层．研究表明,非晶涂层厚度约500μm,涂层的空隙率随喷涂温度和沉积率的增加而减少．涂层腐蚀性能的评价选用1kmol／m^3 HCl水溶液,动电位极化曲线测量表明,随着空隙率的减少,涂层呈现出与非晶合金相当的优良耐蚀性能．     

掺杂了插层2-巯基苯并咪唑Zn/Al层状双氢氧化物自修复涂层的耐蚀性

通过离子交换法制备出了插层2-巯基苯并咪唑(MBI)的Zn/Al层状双氢氧化物(Zn-Al(MBI)LDHs),采用电化学阻抗和人工划痕研究了掺杂了Zn-Al(MBI)LDHs涂层的自修复性能和耐蚀性。结果表明:缓蚀剂MBI分子结构中的苯环平面平行或略有倾斜地置于LDHs的层间;所制备的LDHs实现了MBI的自主释放,同时吸收氯离子;与未掺杂Zn-Al(MBI)LDHs涂层相比,掺杂Zn-Al(MBI)LDHs的涂层表现出优异的耐蚀性,这应归功于从Zn-Al(MBI)LDHs释放出来的缓蚀剂。     

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。     

镁合金微弧氧化陶瓷膜的制备及耐蚀性能

利用微弧氧化技术在AZ91D镁合金表面原位生成含有钙、磷元素的陶瓷膜层.用SEM、XRD、EDS等研究陶瓷膜微观形貌、相组成及元素含量,利用Tafel和EIS技术来评价陶瓷膜的腐蚀性能.结果表明,所制备的陶瓷膜层成功地引入了钙和磷元素,陶瓷膜层主要由Mg2SiO4和MgO相组成.增加钙盐浓度,可以使膜层内的钙元素含量增多,微孔增加并且出现了微裂纹.电化学测试表明陶瓷膜使得镁合金在0.9%NaCl生理盐水中的耐蚀性提高了1～2个数量级,当钙盐浓度为0.3 g/L时,陶瓷膜层的耐蚀性最好.     

磁控溅射铝膜的微观结构对磁致冷钆腐蚀性能的影响

研究了表面镀铝和未镀铝的钆的静态和电化学腐蚀试验。结果表明,未镀铝的钆在水作用下表面形成大量裂痕,而多角状的铝膜结构由于点蚀坑的存在比片状铝膜结构的耐腐蚀性能差。片状铝膜由于与基体之间形成有效的物理阻挡,且片状结构致密,延长了阴极保护。因此,制备表面层状铝膜结构是显著提高磁制冷钆表面耐腐蚀性能行的有效方法。     

Reactive HVOF sprayed TiN-matrix composite coating and its corrosion and wear resistance properties

TiN-matrix composite coating was prepared on 45# steel by reactive high-velocity oxy-fuel (HVOF) spraying. Its microstructure, phase composition, micro-hardness, corrosion resistance in 3.5% NaCl solution and wear resistance were analyzed. The results suggest that the TiN-matrix composite coating is well bonded with the substrate. The micro-hardness measured decreases with the increase of applied test loads. And the micro-hardness of the coating under heavy loads is relatively high. The TiN-matrix composite coating exhibits an excellent corrosion resistance in 3.5% NaCl solution. The corrosion potential of coating is positive and the passivation zone is broad, which indicates that the TiN-matrix composite coating is stable in the electrolyte and provides excellent protection to the substrate. The wear coefficient of the coating under all loads maintains at 0.49–0.50. The wear mechanism of the coating is revealed to be three-body abrasive wear. Yet the failure forms of TiN-matrix composite coating under different loads have an obvious difference. The failure form of coating under light loads is particle spallation due to the stress concentration while that of coating under heavy loads is cracking between inter-lamellae.     

Preparation and performance of fluorescent sensing coating for monitoring corrosion of Al alloy 2024

A kind of fluorescent sensing coating was prepared for monitoring corrosion of aluminum alloys by incorporating phenylfluorone（PF） into acrylic paint as sensing material. The fluorescent dye PF reacts with aluminum ions on corroded aluminum substrate to occur fluorescence quenching observed in UV light. This paint system is sensitive tO underlying corrosion processes through reacting with the Al^3＋ produced by anodic reaction accompanying corrosion. After a certain time, when the samples of Al alloy 2024 coated with PF-acrylic paint were immersed in 1 mol/L NaCl solution, fluorescence quenching spots can be seen with unaided eyes. With the development of corrosion process, the size of fluorescence quenching spots increases. Active corrosion areas on the sample surface were found under the fluorescence quenching spots by optical microscope. The corrosion areas can be observed more clearly by SEM, and many pits are found. This suggests that the fluorescence quenching spots are the sites of produced Al^3＋ by the anodic reaction of the local attack of the coated Al alloy substrate in the chloride solution and the corrosion process of the coated AI alloy can be monitored on-line by the sensing coating. The sensitivity of this coating system for detection of anodic reaction associated with corrosion was determined by applying constant charge current and measuring the charge, at which fluorescence quenching is detected in the coating with unaided eyes. Visual observation of coated samples can detect fluorescence change resulting from a charge corresponding to an equivalent hemispherical pit with approximate depth of 50 μn.