石墨烯-Al2O3复合材料的制备及其防腐性能研究

为研制具有高防腐性能的环氧树脂涂层，采用溶胶 .凝胶法制备一种石墨烯 /三氧化二铝复合材料（GA）并用硅烷偶联剂 Z.6173对其改性后（GAZ）作为填料加入到环氧树脂（EP）涂料中。结果表明：三氧化二铝主要以 α-Al₂O₃的晶型均匀包覆在石墨烯的周围；红外分析证明 Z-6173成功对GA粉体进行了改性； EIS结果表明 GAZ/EP涂层具有最佳的防腐性能，浸泡 30 d后其低频区阻抗值为 14. 5 GΩ·cm²；盐雾测试结果表明 GAZ复合材料的加入可以有效防止由石墨烯优良导电性造成的金属基底加速腐蚀的现象发生。     

氟化石墨烯硅烷功能化对环氧复合涂层耐腐蚀性的影响

采用 γ-缩水甘油醚氧丙基三甲氧基硅烷（ GPTMS）对氟化石墨烯（ FG）进行功能化处理得硅烷功能化氟化石墨烯（ GFG）采用 XRD、FT-IR和 SEM对粉体进行表征；将 FG和 GFG分别加入环氧树脂中获得复合涂层，通过电化，学测试和 5%NaCl中性盐雾试验研究复合涂层的耐腐蚀性。结果表明： FG能有效地增加环氧涂层（EP）的长期耐腐蚀性， FG经过硅烷功能化处理后进一步提升了其与树脂之间的界面相容性，所得复合涂层的致密性进一步提高，从而显著提升了环氧复合涂层的耐腐蚀性。经 3. 5%NaCl溶液 4 000 h浸泡后， GFG改性环氧复合涂层（ GFG/EP）的低频阻抗模值相较于纯 EP涂层提升了 3个数量级，较 FG改性环氧复合涂层（FG/EP）提高了 1个数量级；同时盐雾腐蚀 90 d后， GFG/EP涂层表面无明显腐蚀现象。     

高屏蔽耐温酚醛环氧重防腐涂料的制备及性能研究

针对大型海水淡化关键设备制造成本高、防腐期效短等问题,基于金属表面屏蔽阻隔原理,采用酚醛改性环氧树脂和改性聚酰胺为基料,以氧化铁红、硫酸钡、片状填料等为防腐填料,获得应用于新型低合金耐蚀钢或碳钢基材表面的高屏蔽耐温酚醛环氧重防腐涂料。实验结果表明：该涂料吸水率 1. 2%,抗氯离子渗透性 0. 9×10^-3 mg/cm²·d,柔韧性 1 mm,耐冲击性 50 cm,耐 88 ℃海水浸泡 6 000 h,耐盐雾 10 000 h,涂层耐阴极剥离性能测试被剥离涂层距人造漏涂孔外缘平均距离为 4. 5 mm,经 33 d 88 ℃海水浸泡 0. 01 Hz低频阻抗（ |Z|_{0. 01 Hz}）条件下该涂层电化学交流阻抗值由 8. 28×10¹⁰ Ω·cm²降为 1. 18×10⁸ Ω·cm²,且曲线平滑,说明该涂层具备优异的防腐性能。     

不锈钢表面PANI/Nd2O3/EP复合涂层的制备与性能

为提高环氧复合涂层在304不锈钢表面的防腐性能,采用原位聚合法将聚苯胺(PANI)和氧化钕(Nd₂O₃)制成PANI/Nd₂O₃复合材料,再将其作为增料剂添加到环氧树脂(EP)中,制得PANI/Nd₂O₃/EP复合涂层。通过改变PANI/Nd₂O₃在环氧树脂中的含量,探究了PANI/Nd₂O₃复合材料对复合涂层的附着力、防腐性能和疏水性能的影响。结果表明：添加适量的PANI/Nd₂O₃复合材料可以提高涂层的附着力,增强其防腐性能及疏水性能。当PANI/Nd₂O₃复合材料的质量分数为4%时,复合涂层的附着力、防腐性能和疏水性能均达到最佳。     

卡拉胶改性三聚磷酸铝对水性环氧涂层防腐性能的影响

通通过卡拉胶（KC）对三聚磷酸铝（ATP）进行接枝改性获得KC-ATP改性填料,再将其添加到水性环氧树脂（WEP）中制备复合防腐涂层。采用FTIR、XPS、TG、SEM对ATP改性前后的形貌、结构进行表征。结果表明,KC成功地接枝到ATP表面,改善了ATP的水溶性。采用电化学阻抗谱（EIS）和盐雾实验考察了复合涂层的防腐性能。结果表明,复合涂层的防腐性能明显优于纯水性环氧涂层,且当KC-ATP功能填料含量为1.0%时（以水性环氧树脂的质量为基准,下同）,涂层的耐腐蚀性能达到最佳,浸泡48 h后涂层的极化电阻Rp为8.183×107 Ω∙cm2,远高于ATP改性复合涂层和纯环氧涂层。     

氟硅改性无溶剂环氧涂料的制备与性能

采用甲基丙烯酸十三氟辛酯（TFM）改性氨基硅油（AS）制备氟化氨基硅油（FAS）,并用其改性环氧树脂（EP）探究氨基硅油及氟化氨基硅油添加量对环氧涂层性能的影响。本文通过红外光谱对改性结果进行表征,通过柔韧性测试、画圈附着力测试、铅笔硬度测试、耐冲击测试、热失重测试、接触角测试、紫外加速老化实验和Tafel极化曲线测试,分别评价涂层的柔韧性、附着力、硬度、耐冲击性、耐热性、疏水性、耐候性和防腐性能,通过扫描电镜对涂层断面进行分析,并通过EDS对涂层进行表面元素分析。结果表明,氟添加量为15%制备氟化氨基硅油改性环氧树脂时,氟硅改性EP涂层相对于未改性EP涂层,硬度由2H提升至3H,附着力由2级提升至1级,柔韧性由1mm提升至0.5mm,耐冲击由45cm提升至50cm,热稳定性增强,接触角由70.5°提升至123°,耐紫外老化（432h）由3级提升至1级,E_corr由-0.6187V正移至-0.1720V,I_corr由1.9858×10^-8A/cm²减小至3.7125×10^-10A/cm²。适量氟化氨基硅油的引入,显著提升了环氧涂层的机械性能、耐候性能和防腐性能。     

丙烯酸树脂的制备及其在环氧树脂涂层中的应用研究

通过溶液法合成丙烯酸树脂并表征,然后将其添加到环氧树脂中在镁合金表面制备涂层,通过冲击、柔韧性结合电化学阻抗技术(EIS)研究丙烯酸树脂加入对环氧涂层力学及防护性能的影响。研究结果表明,与纯环氧树脂防腐涂层相比,加入丙烯酸树脂后涂层与基体之间的附着力提高了2 MPa、耐冲击性和疏水性均有改善;添加丙烯酸树脂的涂层在浸泡1 656 h后的阻抗为1.25×10⁹Ω·cm²,而环氧清漆涂层的阻抗仅为3.85×10⁷Ω·cm²;因此加入丙烯酸树脂后使环氧涂层有更优异的防腐性能。     

火山灰微粒改性聚苯胺/环氧涂层的防腐蚀和耐热冲击性能

通过向聚苯胺/环氧涂层中添加适量的火山灰微米粒子（TMP）,有效提高了涂层的防腐性能,同时考察了TMP含量对涂层防腐性能的影响。实验结果表明添加TMP后的涂层在95℃、12% NaCl溶液中浸泡60 d后仍具有较高的低频阻抗值;其中,添加量为10%（质量分数）的涂层的阻抗值最高,为1.27×10⁹ Ω·cm²,说明该涂层仍具有较好的防腐性能。另外,该复合涂层的附着力有所改善,并具有优异的耐热冲击性能。     

四种颜料在有机涂层中的防腐性能对比

利用电化学阻抗谱（EIS）技术,研究了浸泡在3.5%NaCl溶液中的SrCrO4环氧涂层、纳米ZnO环氧涂层、纳米缓蚀剂插层水滑石环氧涂层和ZnO/纳米水滑石复合环氧涂层的防腐性能。结果表明,纳米缓蚀剂插层水滑石涂层对Mg-Li合金的防腐效果明显高于SrCrO4环氧涂层和纳米ZnO环氧涂层,具有活性-自修复的防腐作用;而经过改性的原位生成ZnO纳米水滑石复合涂层的防腐性能更好。     

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。     

Al-B2O3-CeO2-粉煤灰复合增强涂层成分设计及冲蚀磨损分析

为了提高粉煤灰作为增强材料在金属基复合材料中的应用和性能,通过热力学分析和正交优化试验确定Al-B₂O₃-CeO₂-粉煤灰复合增强涂层各成分之间可能发生的反应及最佳配方比例,采用等离子喷涂在ZG310-570基体制备了粉煤灰复合增强涂层,分析了粉煤灰复合增强涂层的表面形貌、物相和冲蚀磨损性能。结果发现,热力学分析和正交优化试验表明Al、B₂O₃、CeO₂和粉煤灰之间能发生固相反应,粉煤灰复合增强涂层配方最佳比例质量分数为粉煤灰55%、B₂O₃20%、Al20%、CeO₂5%;粉煤灰复合增强涂层呈凹凸不平的片层状结构,致密性好,存在纵向裂纹、未充分融化颗粒和孔隙;X射线分析表明粉煤灰复合增强涂层有Al₂O₃、CeB₆、2MgO·SiO₂、3CaO·B₂O₃等新相生成,与热力学分析结果一致;在一定冲蚀时间和冲蚀角度下,不同冲蚀转速时ZG310-570基体表面粉煤灰复合增强涂层的相对耐冲蚀磨损性能比基体分别至少提高了20.41倍、22.43倍和23.17倍。     

氧化石墨烯改性环氧树脂涂料的制备及防腐性能

环氧树脂在溶剂蒸发过程中容易产生微孔,影响其防腐蚀性能。为了提高其对腐蚀介质的阻碍能力,本文采用密闭氧化法制备氧化石墨烯,再利用湿式转移法将氧化石墨烯水溶液分散在环氧树脂中,制备氧化石墨烯/环氧树脂防腐涂料。通过红外光谱（FTIR）、X射线衍射（XRD）和拉曼光谱（Raman）分析氧化石墨烯的结构变化,利用开路电位测试（OCP）、水接触角、腐蚀形貌和气体透过率分析氧化石墨烯/环氧树脂涂料的防腐性能。结果表明,氧化石墨烯/环氧树脂（GO/EP）涂料的开路电位和水接触角分别为0.181V和86.12°,与纯环氧树脂涂料相比,分别提高了0.066V和10.5°;当GO/EP浸泡在3.5%NaCl溶液中腐蚀20天后,表面仅产生了粗糙化,涂层稳定性好,屏障性能强;与EP涂层相比,GO/EP涂层的O₂和H₂O渗透率分别降低了51.2%和65.5%。     

Alumina/Epoxy Interpenetrating Phase Composite Coatings: I, Processing and Microstructural Development

Interpenetrating phase composite (IPC) coatings consisting of continuously connected Al₂O₃ and epoxy phases were fabricated. The ceramic phase was prepared by depositing an aqueous dispersion of Al₂O₃ (0.3 μm) containing orthophosphoric acid, H₃PO₄, (1–9.6 wt%, solid basis) and heating to create phosphate bonds between particles. The resulting ceramic coating was porous, which allowed the infiltration and curing of a second-phase epoxy resin. The effect of dispersion composition and thermal processing conditions on the phosphate bonding and ceramic microstructure was investigated. Reaction between Al₂O₃ and H₃PO₄ generated an aluminum phosphate layer on particle surfaces and between particles; this bonding phase was initially amorphous, but partially crystallized upon heating to 500°C. Flexural modulus measurements verified the formation of bonds between particles. The coating porosity (and hence epoxy content in the final IPC coating) decreased from ∼50% to 30% with increased H₃PO₄ loading. The addition of aluminum chloride, AlCl₃, enhanced bonding at low temperatures but did not change the porosity. Diffuse reflectance FTIR showed that a combination of UV and thermal curing steps was necessary for complete curing of the infiltrated epoxy phase. Al₂O₃/epoxy IPC coatings prepared by this method can range in thickness from 1 to 100 μm and have potential applications in wear resistance.     

环氧豆油树脂涂层的防腐性能研究

以环氧大豆油（ESO）为主要原料,四亚乙基五胺为固化剂,在碳钢基底表面制备了环氧豆油树脂（ESOR）涂层。利用场发射扫描电镜、傅里叶红外变化光谱仪、纳米压痕仪、热重分析仪、接触角测量仪、电化学阻抗谱等技术对ESOR涂层的性能进行了表征。结果发现,原料中ESO的含量有助于提高ESOR涂层的耐水性;而当原料中ESO的含量逐渐增加时,ESOR涂层的硬度、弹性模量和耐蚀性都会随之增强;根据拟合的等效电路,ESO与四亚乙基五胺的摩尔比为2的ESOR涂层的涂层电阻R_c能达到8.22×10¹¹ Ω·cm²,电荷转移电阻R_ct能达到1.32\times10¹⁰ Ω·cm²,表现出了优异的防腐性能。     

水性环氧树脂/纳米SiO2复合疏水涂层的制备及性能研究

用氨基硅油（ APDMS）改性水性环氧树脂（ EP）得到疏水性的环氧树脂乳液（ APDMS-EP）;用 1H,1H,2H,2H-全氟辛基三乙氧基硅烷（ FAS）与纳米 SiO₂反应得到氟改性纳米 SiO₂（F-SiO₂）。采用不同比例的 F-SiO₂与 APDMS-EP进行复配,室温固化制备疏水涂层,并对 F-SiO₂的结构进行了表征,研究了 F-SiO₂用量对涂层的接触角、铅笔硬度、附着力、热稳定性及耐腐蚀性能的影响。结果表明： APDMS的引入使水性环氧树脂涂层的水接触角从 47.3°提高到 97.7°;加入 F-SiO₂后涂层疏水性进一步提高,当加入 15%的 F-SiO₂时,涂层对水和丙三醇的接触角分别为 120.3°和 104.5°,F-SiO₂的加入也增强了涂层的防腐性能。     

Co3O4/CeO2 composite oxides for methane emissions abatement: Relationship between Co3O4–CeO2 interaction and catalytic activity

Co₃O₄/CeO₂ composite oxides with different cobalt loading (5, 15, 30, 50, 70 wt.% as Co₃O₄) were prepared by co-precipitation method and investigated for the oxidation of methane under stoichiometric conditions. Pure oxides, Co₃O₄ and CeO₂ were used as reference. Characterization studies by X-ray diffraction (XRD), BET, temperature programmed reduction/oxidation (TPR/TPO) and X-ray photoelectron spectroscopy (XPS) were carried out.

An improvement of the catalytic activity and thermal stability of the composite oxides was observed with respect to pure Co₃O₄ in correspondence of Co₃O₄–CeO₂ containing 30% by weight of Co₃O₄. The combined effect of cobalt oxide and ceria, at this composition, strongly influences the morphological and redox properties of the composite oxides, by dispersing the Co₃O₄ phase and promoting the efficiency of the Co³⁺–Co²⁺ redox couple. The presence in the sample Co₃O₄(30 wt.%)–CeO₂ of a high relative amount of Ce³⁺/(Ce⁴⁺ + Ce³⁺) as detected by XPS confirms the enhanced oxygen mobility.

The catalysts stability under reaction conditions was investigated by XRD and XPS analysis of the used samples, paying particular attention to the Co₃O₄ phase decomposition. Methane oxidation tests were performed over fresh (as prepared) and thermal aged samples (after ageing at 750 °C for 7 h, in furnace). The resistance to water vapour poisoning was evaluated for pure Co₃O₄ and Co₃O₄(30 wt.%)–CeO₂, performing the tests in the presence of 5 vol.% H₂O. A methane oxidation test upon hydrothermal ageing (flowing at 600 °C for 16 h a mixture 5 vol.% H₂O + 5 vol.%O₂ in He) of the Co₃O₄(30 wt.%)–CeO₂ sample was also performed. All the results confirm the superiority of this composite oxide.     

抗粘附氟碳复合涂层在烟囱中的应用

为提高湿法脱硫后烟囱内壁防护涂层的防腐性能,以氟碳树脂(PEVE)和聚四氟乙烯(PTFE)粒子为原料,采用喷涂工艺及室温固化制备出具有抗粘附性能的防腐蚀氟碳复合涂层。利用硫酸腐蚀实验、抗粘附冷凝实验、耐温实验、耐磨性实验,分别评价涂层的耐酸性、抗粘性、耐温性、耐磨性,并通过扫描电子显微镜对腐蚀前后涂层的形貌变化进行分析。结果表明,当PTFE∶PEVE的质量比为1∶2时,制备的PTFE/PEVE复合涂层在竖直倾角小于5°且酸气温度小于60℃时,表面未出现酸性冷凝液附着,具有优异的抗粘附特性;且分别经室温20%H₂SO₄浸泡90 d和低温(50℃)10%H₂SO₄的浸泡7 d,涂层表现出较强的耐酸性能;涂层表面能承受200℃的高温而不发生脱落、鼓包、开裂等现象,具有良好的耐温性能。此外,受力氟碳复合涂层在砂纸上拖行200 cm后,表面疏水角度降为150.2°,依旧保持超疏水状态,具有良好的耐磨性。     

CeO2改性WO3/g-C3N4光催化氧化脱硫性能

以钨酸铵、六水硝酸铈、尿素为原料,采用熔融法制备CeO₂-WO₃/g-C₃N₄催化剂,并对样品进行XRD、UV-Vis、TEM、PL和XPS表征。结果表明：CeO₂的引入可以提高WO₃在g-C₃N₄上的分散度,抑制光生电子空穴对的复合,同时Ce⁴⁺/Ce³⁺良好的储氧放氧能力有利于氧空位和活性氧的生成,从而有利于WO₃/g-C₃N₄催化剂的催化性能。在以高压钠灯模拟可见光源的条件下,以过氧化羟基异丙苯为氧化剂,考察了CeO₂的加入量对催化剂氧化二苯并噻吩(DBT)性能的影响,结果表明：最佳的CeO₂引入量为5%(质量分数),在80℃、氧硫摩尔比(O/S)为5.0的反应条件下,反应180 min时DBT在WO₃/g-C₃N₄和CeO₂-WO₃/g-C₃N₄催化剂的作用下转化率分别为72.9%和86.4%,且改性后的催化剂可以循环使用8次而催化活性没有明显降低。     

The effect of CeO2 structure on the activity of supported Pd catalysts used for methane steam reforming

Palladium (Pd) supported on CeO₂-promoted γ-Al₂O₃ with various CeO₂ (ceria) crystallinities, were used as catalysts in the methane steam reforming reaction. X-ray diffraction (XRD) analysis, FTIR spectroscopy of adsorbed CO, and X-ray photoelectron spectroscopy (XPS) were employed to characterize the samples in terms of Pd and CeO₂ structure and dispersion on the γ-Al₂O₃ support. These results were correlated with the observed catalytic activity and deactivation process. Arrhenius plots at steady-state conditions are presented as a function of CeO₂ structure. Pd is present on the oxidized CeO₂-promoted catalysts as Pd⁰, Pd⁺ and Pd²⁺, at ratios strongly dependent on CeO₂ structure. XRD measurements indicated that Pd is well dispersed (particles <2 nm) on crystalline CeO₂ and is agglomerated as large clusters (particles in 10–20 nm range) on amorphous CeO₂. FTIR spectra of adsorbed CO revealed that after pre-treatment under H₂ or in the presence of amorphous CeO₂, partial encapsulation of Pd particles occurs. CeO₂ structure influences the CH₄ steam reforming reaction rates. Crystalline CeO₂ and dispersed Pd favor high reaction rates (low activation energy). The presence of CeO₂ as a promoter conferred high catalytic activity to the alumina-supported Pd catalysts. The catalytic activity is significantly lower on Pd/γ-Al₂O₃ or on amorphous (reduced) CeO₂/Al₂O₃ catalysts. The reaction rates are two orders of magnitude higher on Pd/CeO₂/γ-Al₂O₃ than on Pd/γ-Al₂O₃, which is attributed to a catalytic synergism between Pd and CeO₂. The low rates on the reduced Pd/CeO₂/Al₂O₃ catalysts can be correlated with the loss of Pd sites through encapsulation or particle agglomeration, a process found mostly irreversible after catalyst regeneration.