聚苯胺/环氧树脂复合乳液防腐蚀性能研究

利用乳液聚合方法制备了水性聚苯胺(PANI)乳液,测试了乳液的平均粒径及聚苯胺的电导率,并对乳液进行了透射电镜(TEM)分析。再将该产物与水性环氧树脂乳液共混制备了水性聚苯胺/环氧树脂复合乳液(PA-NI/EP),通过开路电位(OCP),电化学交流阻抗谱(EIS),扫描电镜(SEM)和表面能谱(EDS)对其涂层性能进行了研究。结果表明,涂敷PANI/EP复合乳液涂层的金属表面形成了氧化膜,有效地阻止了腐蚀,涂层对A3钢具有较好的防腐蚀效果。     

聚苯胺/磷化含氟丙烯酸酯复合乳胶涂层的防腐蚀性能

以十二烷基硫酸钠(SDS)为乳化剂和掺杂剂,采用化学氧化聚合法合成了一种稳定的聚苯胺(PANI)乳液,该乳液与合成的磷化含氟丙烯酸酯(P-FAc)乳液以不同的比例制备复合乳胶涂层。采用傅里叶变换红外光谱仪对合成的PANI和P-FAc进行了结构表征;通过接触角、附着力、极化曲线、开路电位和电化学阻抗谱测试了复合涂层对Q235钢的防腐蚀性能;通过扫描电子显微镜观察了揭掉PANI/P-FAc复合涂层后的Q235钢表面形貌。结果表明:当PANI乳液与P-FAc乳液的质量比为1∶1时,复合涂层的性能最佳,其腐蚀电流密度仅为1.09×10~(-6)A/cm~2,平衡电位为-0.55 V,阻抗为10~(4.3)Ω·cm~2。     

改性石墨烯/聚苯胺/环氧树脂复合材料的制备及防腐性能的研究

采用原位聚合法制备改性石墨烯/聚苯胺(PGO/PANI)复合材料,再通过共混的方式将PGO/PANI和环氧树脂复合制备PGO/PANI/EP复合涂层。利用电化学阻抗测试探究了PGO/PANI/EP的防腐能力,并模拟在3.5%NaCl溶液加速浸泡后复合涂层的防腐能力的变化。结果表明,当PGO含量为7%时,复合材料的防腐性能最佳,在3.5%NaCl溶液中浸泡24 h后复合涂层的涂层电阻为5.99×10~5Ω·cm~2,仍具有较好的阻隔性能。     

聚苯胺-氟碳乳液复合防腐蚀涂料研究

以聚苯乙烯磺酸(PSSA)为掺杂剂,利用原位插层聚合方法制备了聚苯胺(PANI)-蒙脱土(MMT)复合材料,对其结构进行了XRD表征,测试了变温电导率;并以水性氟碳乳液为成膜物,制备了水分散体PANI-氟碳乳液复合防腐涂料,利用电化学交流阻抗谱和Tafel曲线考察了对Q235的防腐蚀性能.试验结果表明:PANI-MMT复合材料中的蒙脱土以片层剥离状态存在的;PSSA-PANI-MMT复合材料具有稳定的变温电导率;PANI-MMT-FC复合涂料具有最高的阻抗和腐蚀电位(-0.42 V)以及最低的腐蚀电流密度(10-8.6 A/cm2).对Q235有很好的防腐蚀效果.     

聚苯胺/纳米碳酸钙复合物的制备及其防腐性能

以苯胺单体为原料、过硫酸铵为氧化剂,采用化学氧化法制备了本征态聚苯胺,将其与纳米CaCO3通过溶液共混法制备了聚苯胺/CaCO3复合物。采用扫描电镜(SEM)、X射线衍射(XRD)、紫外–可见光谱(UV–Vis)和红外光谱(IR)对聚苯胺/CaCO3复合物进行了形貌观察和结构表征。分别以聚苯胺、聚苯胺/CaCO3复合物为填料,加入到环氧树脂(EP)/聚酰胺固化剂体系中,在碳钢表面制备了EP/聚苯胺和EP/聚苯胺/CaCO3复合涂层,通过开路电位、极化曲线和交流阻抗谱等电化学方法对比研究了裸钢以及含EP涂层、EP/聚苯胺涂层、EP/聚苯胺/CaCO3复合涂层的碳钢试片在3.5%NaCl溶液中浸泡不同时间的腐蚀行为。结果表明,聚苯胺膜较好地包覆在CaCO3纳米粒子表面;CaCO3的加入增强了涂层的致密性,提高了聚苯胺分子对金属基体的粘附力。含有聚苯胺/纳米CaCO3复合物的环氧涂层具有最强的抗腐蚀能力,其次为环氧/聚苯胺涂层;两者相比,EP/聚苯胺/CaCO3复合涂层的腐蚀电位正移了59 mV,腐蚀电流密度降低了63%。     

盐酸掺杂聚苯胺/炭黑作填料的导电涂料制备及其防腐蚀性能研究

采用共混法,以盐酸掺杂聚苯胺(HCl PANI)和炭黑(CB)为混合导电填料,环氧树脂E-44和107胶为粘合剂制备了导电涂料,将其涂覆于Q235钢基片上制备了防腐蚀涂层。采用电化学、耐酸性和中性盐雾试验等手段评价了涂层的防腐蚀性能。实验结果表明:导电涂层附着力较好,具有良好的耐酸性和耐中性盐雾性能;在3.5%Na Cl水溶液中以盐酸掺杂聚苯胺/炭黑(HCl PANI/CB)为混合填料制备的涂层使裸钢的开路电位从-0.849 V正移至-0.482 V,说明涂层对钢基片具有良好的防腐蚀性。     

磺化聚苯胺/硅树脂涂层的制备及防腐蚀性能

分别以十二烷基硫酸钠(SDS)和木质素磺酸钠(LGS)为掺杂剂,通过化学氧化法合成了两种磺化聚苯胺(PANI-SDS和PANI-LGS),并将合成的磺化PANI混入溶胶-凝胶法制备的硅树脂(SiR)中,刷涂在Q235钢表面制备了复合防腐蚀涂层。采用FTIR表征了磺化PANI的结构;对比了PANI-LGS和PANI-SDS的基本性能,考察了SiR、PANI-SDS/SiR和PANI-LGS/SiR复合涂层的耐水性、附着力、机械性能及防腐蚀性能,并分析了复合涂层的防腐蚀机理。结果表明:制备的PANI-LGS/SiR复合涂层疏水性能较好,接触角达到113.0°,吸水率仅为7.58%。电化学测试结果表明,该复合涂层对Q235钢具有良好的防腐蚀性能,腐蚀速率为5.56×10~(-3) mm/a,复合涂层是通过物理屏蔽和阳极保护作用实现对金属的腐蚀防护。     

功能化氧化石墨烯/聚苯胺/环氧树脂 复合涂料的制备及其性能

以自制的功能化氧化石墨烯(C-GO)/聚苯胺(PANI)复合材料为改性填料,对环氧树脂(EP)进行改性,制备了C-GO/PANI/EP复合涂料,研究了复合涂料的防腐性能和防腐机理。结果表明,当C-GO质量分数为3%时,复合涂料硬度最高,吸水率最低,防腐性能最佳。C-GO/PANI是通过填补EP表面的空隙,改善EP的屏蔽性能,阻止O2和H2O的渗入,从而提高EP的防腐性能。     

聚苯胺/SiO_2复合粒子的制备及其防腐性能

以二氧化锰代替常规的过硫酸铵氧化体系,并在化学氧化聚合反应体系中添加适当比例的二氧化硅粒子,制备出盐酸掺杂的聚苯胺包覆二氧化硅复合粒子。扫描电子显微镜(SEM)观察表明,二氧化硅表面及其粒子之间明显包覆一层聚苯胺(PANI);傅立叶变换红外光谱(FTIR)证明了其掺杂的有效性。将复合粒子作为防腐填料,加入环氧树脂做成膜物,制备出的聚苯胺/环氧树脂复合涂料在碳钢基体上进行涂层,采用加速浸泡实验、开路电位法、Tafel极化曲线考察了其防腐性能。结果表明,盐酸掺杂的聚苯胺复合涂层具有优良的防腐性能,该复合涂层的腐蚀电位较环氧树脂涂层提高400mV,腐蚀电流下降4～5个数量级,有望成为一种低成本、高性能防腐涂料。     

掺杂态聚苯胺的乳液聚合及其与环氧树脂所制涂层的耐蚀性

以十二烷基苯磺酸钠(SDBS)为乳化剂,采用乳液聚合法制备了盐酸或磷酸与十二烷基苯磺酸(DBSA)共掺杂的聚苯胺[(HCl+DBSA)-PANI或(H_3PO_4+DBSA)-PANI]。用扫描电镜、傅里叶变换红外光谱仪、X射线衍射仪和四探针电导率测试仪表征了掺杂聚苯胺的形貌、结构和电导率。将添加了掺杂态聚苯胺的E44环氧树脂刷涂在Q235低碳钢表面得到复合涂层(PANI/EP),并通过电化学阻抗谱和浸泡试验考察了它们在3.5%NaCl溶液中的耐蚀性。两种共掺杂态聚苯胺都呈束状结构,(HCl+DBSA)-PANI的结构更均一。添加PANI可以明显提高环氧涂层对碳钢的防腐作用,其中(HCl+DBSA)-PANI的效果更好。     

聚苯胺／膨润土／水性叔氟乳液复合防腐涂层的研究

采用水性叔氟乳液为成膜物质,制得聚苯胺/膨润土/水性叔氟乳液复合涂层材料.电化学阻抗谱和塔菲尔曲线测试结果发现:其具有较高的阻抗和腐蚀电位(-0.20 V)以及最低的腐蚀电流密度(10-10.5A/cm2),通过扫描电镜照片也发现复合涂层在低碳钢表面形成致密的膜层,从而具有良好的防腐蚀效果.     

Investigation of corrosion protection performance of epoxy coatings modified by polyaniline/clay nanocomposites on steel surfaces

In this study, polyaniline (PANI) and polyaniline/clay nanocomposites were prepared via in situ oxidative polymerization. The morphology of nanocomposites structures was investigated by X-ray diffraction (XRD). The chemical structures of PANI and PANI/clay nanocomposites were examined via Fourier transform infrared (FT-IR) spectroscopy. Polyaniline-based pigments were introduced into epoxy paint and applied on steel substrates. The effect of clay addition and the type of clay cation, including Na⁺ in natural clay (MMT) and alkyl ammonium ions in organo-modified montmorillonite (OMMT), on the anticorrosion performance of epoxy-based coatings was investigated through electrochemical Tafel test, electrochemical impedance spectroscopy and immersion measurements in NaCl solution. The stability of the adhesion of the neat and modified epoxy coatings to the steel surface was also examined. The results indicated that introduction of PANI/OMMT nanocomposite into epoxy paint results in improved anticorrosion properties in comparison with PANI/MMT and neat PANI.     

Synthesis of polyaniline nanofiber and anticorrosion property of polyaniline–epoxy composite coating for Q235 steel

Polyaniline (PANI) nanofibers were prepared by direct mixed oxidation in four kinds of inorganic acids. The characterization of scanning electron microscopy (SEM) showed that high quality PANI fibers with uniform diameter and several microns length can be obtained by direct mixed oxidation, especially in a sulfuric acid system. Structural characteristics of PANI products through IR and UV spectra indicated the consistent peak distribution with the classic spectrum of the doped PANI. In addition, composite coatings of PANI–epoxy resin were prepared by mechanical grinding. The effect of PANI’s content on anticorrosion property of the composite coatings for Q235 steel was studied by the electrochemical impedance spectroscopy (EIS). Results showed that the best shielding protective effect was obtained when the amount of PANI was around 0.5% (wt%). More importantly, the effects of four different inorganic acids on anticorrosion property of the composite coatings were studied by the EIS and Tafel polarization curve. Experiments showed that the different composite coatings of PANI doped by different inorganic acids provided different protective abilities for the Q235 steel. It can be concluded that both the morphology and counter-anion would impact the anticorrosion effect of the doped PANI.     

Conductivity and anticorrosion performance of polyaniline/zinc composites: Investigation of zinc particle size and distribution effect

Polyaniline/zinc composites and nanocomposites were prepared using solution mixing method. Zinc (Zn) particles with an average particle size of 60 μm and zinc nanoparticles with an average particle size of 35 nm were used as fillers in polyaniline (PANI) matrix. Films and coatings of PANI/Zn composites and nanocomposites were prepared by the solution casting method. Electrical conductivity and anticorrosion properties of PANI/Zn composite and nanocomposite films and coatings with different zinc loadings were evaluated. According to the results, electrical conductivity and anticorrosion performances of both PANI/Zn composites and nanocomposites were increased by increasing the zinc loading. Also results showed that the PANI/Zn nanocomposite films and coatings have better electrical conductivity and corrosion protection effect on iron coupons compared to that of PANI/Zn composite.     

溴代环氧/环氧复合涂层防腐性能研究

针对金属腐蚀问题,制备了以环氧涂层为底漆,溴代环氧涂层为面漆的溴代环氧/环氧复合涂层。研究结果表明：环氧树脂的极性为涂层提供良好的附着力,溴代环氧树脂的疏水性有效提高涂层的抗渗透性能。复合涂层具有低润湿性（吸水率：0.217%,接触角：93.6°）、高附着力（干：5.28 MPa,湿：2.52 MPa）和优异的耐盐水防腐性能（浸泡70 d后,|Z|_{0.01 Hz}>10⁸ Ω·cm²）。通过综合利用溴代环氧树脂和环氧树脂的优势,使复合涂层具有良好疏水性、屏蔽性,有效提高涂层的防护能力,实验结果表明,该涂层具有防腐的长效性和实用性。     

聚苯胺/环氧复合阴极电泳涂料防腐蚀性能的研究

运用插层聚合的方法制备了蒙脱土／聚苯胺复合材料，并进行了表征。将该复合材料通过共混的方式加入聚酰胺／环氧阴极电泳（CED）涂料中配制成聚苯胺／环氧复合阴极电泳涂料，并利用电化学阻抗谱方法对各电泳涂层的防腐性能进行了分析。研究发现：在3．5％NaCl溶液中浸泡10d后，腐蚀介质不能到达涂层／基底金属界面，金属表面没有发生腐蚀反应。随着聚苯胺含量的增加，复合电泳涂膜的阻抗值增加，具有较好的防腐性能。当聚苯胺含量相同时，与掺杂态聚苯胺复合电泳涂膜相比，本征态聚苯胺复合电泳涂膜具有很高的阻抗值，表现出更好的防腐性能。     

功能酸二次掺杂聚苯胺的防腐蚀性能

聚苯胺具有独特的掺杂脱掺杂特性,能在特定的反应条件下合成出形貌较好的纳米纤维,使得通过脱掺杂和二次掺杂能制备出拥有特殊防腐官能团的新型纳米材料。将硫酸体系中合成的聚苯胺纳米纤维经氨水脱掺杂,再用磷酸、对甲苯磺酸和酒石酸等功能酸在脱掺杂态聚苯胺基础上制备出二次掺杂态聚苯胺,测试了聚苯胺/环氧树脂复合涂层的防腐蚀性能,并与功能酸一次掺杂态聚苯胺进行了对比。结果表明,功能酸掺杂的聚苯胺都有一定的防腐蚀效果;功能酸二次掺杂态聚苯胺比一次掺杂态聚苯胺有更好的防腐蚀性能,二次掺杂态聚苯胺涂层拥有更高的阻抗,其中酒石酸二次掺杂态聚苯胺涂层的阻抗最高,浸泡120 d后为3.48×10⁷ Ω·cm²,较其一次掺杂态聚苯胺涂层高出一个数量级。     

Preparation of PANI/epoxy/Zn nanocomposite using Zn nanoparticles and epoxy resin as additives and investigation of its corrosion protection behavior on iron

Conducting polyaniline, zinc and epoxy resin solely have anticorrosive properties by different mechanisms on metallic substrates. In this work the triple hybrid of PANI/epoxy/Zn nanocomposite was prepared as a thin layer coating (70 ± 5 μm) on iron coupons and its anticorrosion performance was investigated in HCl (0.1 M) as corrosive solution. Epoxy resin and zinc nanoparticles were applied as additives in the PANI matrix to improve the mechanical properties of PANI coating and investigate their synergetic effects on the anticorrosion performance of PANI coating. At first PANI/Zn nanocomposite coatings with different Zn contents were prepared and the zinc content optimized so that the coating achieve the best anticorrosion performance. Accordingly the iron coupons coated by PANI/Zn coating having 4 wt% Zn content showed more noble open circuit potential and lower corrosion current values. Then epoxy resin was applied as additive to the optimized formulation of PANI/Zn coating in different weight percents (0–20 wt%) and the anticorrosion performance of the related PANI/epoxy/Zn triple hybrid nanocomposite coatings was evaluated. Results showed that the addition of epoxy resin causes to the decreasing of corrosion current of iron samples coated by PANI/epoxy/Zn nanocomposite. An optimum range of 3–7 wt% was obtained for the epoxy content in the composition of PANI/epoxy/Zn nanocomposite in which the coating exhibits the best anticorrosion performance. Iron metal coupon was elementally analyzed and the PANI/Zn and PANI/epoxy/Zn nanocomposites were characterized using Fourier Transform Infrared spectroscopy, X-ray diffraction patterns and Scanning Electron Microscopy techniques.