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。     

硼酸掺杂聚苯胺的制备及其在提高硅树脂涂层防腐性能中的应用

以硼酸(BA)为掺杂剂,过硫酸铵(APS)为引发剂,通过化学氧化法合成了硼酸掺杂聚苯胺(PANI-BA).通过傅里叶变换红外光谱(FTIR)、扫描电镜(SEM)、接触角测量仪等对PANI-BA的结构、形貌及疏水性进行了分析.以硅树脂(SiR)为成膜物,在Q235钢表面制备了PANI-BA/SiR复合涂层,测试它的水接触角、吸水率、腐蚀电化学行为及耐盐雾性能.结果表明,PANI-BA具有特殊的形貌,当苯胺与硼酸的物质的量比为1:1.5时,产物为较规整的纳米棒结构,水接触角达144.7°.PANI-BA/SiR复合涂层具有良好的疏水性能和防腐蚀性能,水接触角达120.9°,吸水率仅为1.32％,可耐960 h中性盐雾试验.     

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。     

磷化聚苯胺用量对复合涂层防腐蚀性能的影响

以植酸(PhA)为掺杂剂通过化学氧化法合成了一种磷化聚苯胺(P-PANI),并将其混入硅树脂(SiR)中,刷涂在镁锂(Mg-Li)合金表面制备了P-PANI/SiR复合防腐蚀涂层。采用FTIR、UV-Vis-NIR和XPS表征了P-PANI的结构;研究了P-PANI含量对复合涂层疏水性、附着力及防腐蚀性能的影响。结果表明：当P-PANI占SiR的质量分数为2.0%时,得到的复合涂层表现出较好的疏水性和防腐蚀性能。其水接触角为125.4°,复合涂层的干、湿附着力均为0级,腐蚀电流密度为5.15×10-10 A/cm2,电化学阻抗值达到108 Ω•cm2。     

PANI/SiO2-VTEO/SiO2疏水复合膜的制备及防腐蚀性能

以硅酸乙酯(TEOS)为前驱体,通过溶胶凝胶法制备二氧化硅(SiO2)溶胶,并以乙烯基三乙氧基硅烷(VTEO)对其改性,得到改性SiO2溶胶(VTEO/SiO2);同时制备磷酸掺杂聚苯胺(PANI)接枝SiO2复合粒子(PANI/SiO2)。将改性溶胶和复合粒子均匀混合后在Q235钢表面制备了PANI/SiO2-VTEO/SiO2复合膜。利用红外光谱(FTIR)分析了改性SiO2溶胶和PANI接枝SiO2的化学结构;通过扫描电子显微镜(SEM)分析了复合膜的形貌;利用接触角测试仪测试了复合膜的疏水性能;采用电化学阻抗谱(EIS)、开路电位(OCP)、极化曲线对制备的PANI/SiO2-VTEO/SiO2复合膜进行防腐蚀性能研究。结果表明,复合膜的水接触角为150°,表现出良好的疏水性能;复合膜具有较高的电化学阻抗(5.0×106Ω)和开路电位(-0.18 V),较低腐蚀电流密度(1.18×10-8A/cm2),腐蚀速率仅为0.000 1 mm/a,表现出了良好的防腐蚀性能。     

磷化聚苯胺用量对复合涂层防腐蚀性能的影响

以植酸(Ph A)为掺杂剂,通过化学氧化法合成了一种磷化聚苯胺(P-PANI),并将其混入硅树脂(SiR)中,刷涂在镁锂(Mg-Li)合金表面制备了P-PANI/SiR复合防腐蚀涂层。采用FTIR、UV-Vis-NIR和XPS表征了P-PANI的结构;考察了P-PANI含量对复合涂层疏水性、附着力及防腐蚀性能的影响。结果表明:当P-PANI占SiR的质量分数为2.0%时,得到的复合涂层表现出较好的疏水性和防腐蚀性能。其水接触角为125.4?,复合涂层的干、湿附着力均为0级,腐蚀电流密度为5.15×10–10 A/cm~2,电化学阻抗值达到6.5×109?·cm~2。     

功能填料的制备及其对硅树脂涂层性能的影响

为了提高涂层的防腐蚀性能,首先以植酸为掺杂剂,采用化学氧化法制备磷化聚苯胺(P-PANI);再采用改进的Hummers法制备氧化石墨烯(GO)并对其进行还原得到还原氧化石墨烯(RGO),然后将P-PANI、RGO作为功能填料加入到硅树脂(SiR)中,刷涂在镁锂(Mg-Li)合金表面制备了P-PANI/RGO/SiR复合涂层。用傅里叶变换红外光谱(FTIR)和扫描电子显微镜(SEM)表征了功能填料的结构和形貌;研究了功能填料对涂层基本性能、疏水性能和防腐蚀性能的影响。结果显示:同时加入P-PANI和RGO的SiR涂层表现出较好的性能,干湿附着力均为0级,接触角为97.24°,腐蚀电流密度仅为4.03×10~(-7) A×cm~(-2),腐蚀防护效率高达97.64%。     

水分散性聚苯胺/环氧树脂乳液防腐蚀涂层研究

利用原位插层聚合方法制备了水分散性的聚苯胺/蒙脱土复合材料(PANI/MMT),对其结构进行了XRD表征,测试了变温电导率;并以水性环氧树脂乳液为成膜物,制备了水分散性聚苯胺/环氧树脂乳液复合防腐蚀涂层材料(PANI/MMT/EP),通过开路电位(OCP)、电化学交流阻抗谱(EIS)和塔菲尔曲线(Tafel)对其性能进行了研究,结果表明,PANI/MMT/EP复合涂层对A3钢具有较好的防腐蚀效果,腐蚀电流降低到10-9.7A/cm2。     

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/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。     

金属表面Ni/Al-13wt%TiO2/Al2O3梯度复合陶瓷涂层的腐蚀行为

为了解决陶瓷涂层中的通孔问题，把复合材料与梯度材料的主应用到陶瓷涂层，采用等离子喷涂技术在Q235钢表面形成Ni/Al-13wt％TiO2/Al2O3梯度复合陶瓷涂层，对其在沸腾的5％HCl溶液中的腐蚀行为进行了研究。结果表明，Ni/Al-13wt%TiO2/Al2O3梯度复合陶瓷涂层中的通孔率较单一层Al2O3陶瓷涂层显著降低，带有该梯度复合陶瓷涂层试样的耐蚀性明显提高，该涂层腐蚀14天仍未出现鼓泡削落现象。     

固化剂对有机改性凹凸棒石/聚苯胺环氧树脂复合涂层性能的影响

固化剂对涂层的防腐、力学性能起着至关重要的作用.以环氧树脂为成膜物质,采用原位复合法在环氧树脂体系中合成有机改性凹凸棒石/聚苯胺(OAT/PAn)复合涂层,分别使用改性脂肪胺固化剂593、酚醛胺固化剂T-31以及聚酰胺固化剂650对上述涂层进行固化,讨论了不同种类固化剂对涂层的化学结构、防腐和力学性能以及耐水性能的影响.利用FTIR 对比了各涂层的固化结构,证明了三种固化剂均可使复合涂层固化;SEM结果表明,593固化剂固化涂层的致密性最好;电化学实验结果表明,593固化剂的固化涂层防腐性能最佳,腐蚀电位达到了Ecorr=-318 mV,腐蚀电流密度Icorr=1.193×10-6 A·cm-2;通过划格法评价了各涂层的附着力,发现593固化剂固化效果最好,附着力可达5B;对比浸泡168 h后涂层的耐水性发现,593固化剂耐水性最好.     

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.     

不同表面处理条件下复合涂层体系失效过程的EIS特征

研究了不同表面处理条件下环氧富锌/环氧云母氧化铁/氯化橡胶涂层体系的电化学阻抗谱特征。利用Bode图、涂层吸水率、涂层电阻及特征频率的变化评价了表面处理对涂层防护性能的影响。结果表明,基材表面状态不同的复合涂层体系吸水率相对稳定阶段所持续的时间长短顺序为：手工打磨>表面锈蚀>表面未处理,与涂层的防护寿命长短、涂层/基材间的黏附力大小顺序一致。此外,不论基材表面处理程度如何,当涂层体系的特征频率增加到1400 Hz左右时,涂层电阻均发生较快降低,吸水率发生较大增长,涂层失去防护作用。     

硅烷偶联剂预处理对Q235钢表面聚偏氟乙烯涂层性能的影响

先采用KH-560硅烷偶联剂体积分数不同的硅烷溶液处理Q235钢,再制备聚偏氟乙烯(PVDF)防腐涂层。研究了KH-560体积分数对硅烷溶液水解率及PVDF涂层的表面形貌、疏水性和耐蚀性的影响。结果表明,采用KH-560体积分数为9%的硅烷溶液预处理Q235钢后制备的PVDF涂层表面疏水性较强,在400°C内具有较好的热稳定性,硬度为5H,耐弯曲性、耐酸碱性、耐盐水性(14 d)均优于未采用硅烷溶液处理的O235钢上涂覆的PVDF涂层。     

添加钠长石SiO2基固相反应型陶瓷涂层研究

采用Q235钢和MB2合金为基体,将钠长石添加到陶瓷骨料中制备SiO2基固相反应型陶瓷涂层,在确定了各涂层成分最佳配比后,通过对涂层的物相分析,耐磨、耐蚀性能测试,研究钠长石的加入对涂层性能的影响。实验结果表明:钠长石的加入有助于涂层固化过程中新相的产生,大量的新相不仅仅提高了涂层致密性,还使涂层耐磨耐蚀性能提升,SiO2基固相反应型陶瓷涂层使Q235钢耐酸、耐盐性分别提高11.28倍、28.74倍,耐磨损性能提高3.09倍;使MB2合金耐酸性、耐盐性分别提高20.52倍、11.22倍,耐磨损性能提高0.57倍。     

Study of corrosion and friction reduction of electroless Ni–P coating with molybdenum disulfide nanoparticles

One composite coating of Ni–P alloys containing MoS₂ nanoparticles was prepared by electroless technique based on the better friction reduction ability of MoS₂ and better anticorrosion property of electroless Ni–P alloys on carbon steel surfaces. Electrochemical method—that is, using Tafel polarization curves—was carried out in order to study the corrosion performance of the coating. The results indicate that the anticorrosion ability of the composite coating was decreased because of the addition of nano-MoS₂ particles. The corrosional surfaces were studied and analyzed through scanning electron microscopy (SEM). The corrosion mechanism of the composite coatings was mainly ascribed to the formation of microcells around the nanosized MoS₂ particles, and the active ion-like Cl⁻ destroyed the surface film and induced the corrosion on the inside part of the coating. The friction coefficient of electroless composite coatings was measured by end-facing tribometer. It was found that the friction coefficient of the Ni–P–(nano-MoS₂) composite coating decreased greatly compared with those of Ni–P electroless coatings.     

聚吡咯的绿色制备及其环氧树脂复合涂层对Q235钢的防腐性能

采用一种绿色、温和的氧化体系（H2O/FeCl2/H2O2）合成了结构规整的聚吡咯纳米微球,其结构和形貌采用FTIR和SEM进行表征。以聚吡咯为功能成分,环氧树脂为成膜物质,制备了聚吡咯/环氧树脂复合涂层,研究了其复合涂层在3.0% NaCl溶液中的防腐性能（EIS曲线、开路电位、Tafel极化曲线）,结果表明0.6% Ppy-H复合涂层在3.0% NaCl溶液中浸没60天后,仍表现出高的涂层电阻（5.14×107 Ω?cm2）和腐蚀电位 （Vcorr = ?0.202 mV）。     

老化时间对桥连聚硅氧烷涂层防腐性能的影响

为提高涂层防腐蚀性能,以环氧丙氧丙基三甲氧基硅烷(GPTMS)和N-(3-三甲氧基硅基乙基)乙二胺(NTMDA)为原料经环氧-胺基开环反应得到含羟基有机桥联硅烷前驱体GN。然后,前驱体GN在乙酸催化下制得硅烷溶胶。最后,将硅烷溶胶以浸渍-提拉方式沉积在Q235钢片上,得到含羟基桥联聚倍半硅氧烷涂层。用极化曲线和电化学阻抗谱等技术对涂层的防腐蚀性能进行评价,重点探究了胶体老化时间对涂层防腐蚀性能的影响规律。结果表明：当胶体老化时间为4 h时,涂层在低频0.01 Hz处的电化学交流阻抗相较于空白钢片高出1.5个数量级,具有优异的防腐蚀性能。另外,涂层附着力级别为1级。     

Corrosion protection of new composite polymer coating for carbon steel in sulfuric acid medium by electrochemical methods

In this paper, electropolymerization technique has been used for the obtained of new composite: polypyrrole – dioctyl sulfosuccinate sodium/poly N-ethylaniline (PPY-AOT/PNEA) coatings over carbon steel of type OLC 45 electrode for anticorrosion protection. The PPY-AOT/PNEA coatings were successfully synthesized onto OLC 45 electrode by galvanostatic deposition from aqueous solutions 0.1 M NEA, 0.1 M PY, 0.01 M AOT and 0.3 M H₂C₂O₄ solution at different current densities (5, 3 and 1 mA/cm²) in different molar ratio. The anionic surfactant (AOT) as a dopant ion used during electropolymerization can have a significant result on the anticorrosion protection of the composite film by hindering the penetration of aggressive ions. The polymeric composite coatings have been analyzed by cyclic voltammetry (CV), Fourier transform infrared (FT-IR) spectroscopy and scanning electron microscopy (SEM) methods. The corrosion resistance of PPY-AOT/PNEA coated carbon steel has been examined by potentiodynamic polarization techniques and electrochemical impedance spectroscopy (EIS) methods in 0.5 M H₂SO₄ solutions. The data of the corrosion samples demonstrated that PPY-AOT/PNEA coatings assure a great anticorrosion protection of OLC 45 electrode in corrosive media. The corrosion rate of PPY-AOT/PNEA coated OLC 45 has been indicated to be ~9 times lower than of uncoated electrode. The corrosion protection effectiveness of the composite coating is more than 89%. The best efficiency is accomplished of PPY-AOT/PNEA obtained by electrodeposition at 5 mA/cm² current densities applied in molar ratio 5:1.