氟碳/石墨烯复合涂层的耐蚀性能研究

采用超声分散技术制备了氟碳树脂/石墨烯复合涂层,通过结合强度测试、接触角测试、电化学测试和盐雾试验等研究了石墨烯对氟碳涂层性能的影响。结果表明,涂层中加入石墨烯后其结合强度、接触角和耐盐雾性能均有一定程度的提高。石墨烯含量为0.05wt%时,复合涂层的涂层电阻和电荷转移电阻比其他涂层高2~3个数量级,具有最好的腐蚀防护性能。     

石墨烯浆料在环氧锌粉复合防腐涂料中的应用

通过预分散工艺将石墨烯制备成在涂料中易分散的石墨烯浆料,利用扫描电镜分析了石墨烯的分散性。采用预分散的石墨烯浆料取代传统环氧富锌涂料中的部分锌粉,研制了一种石墨烯-环氧锌粉复合防腐涂料。利用盐雾试验考察涂料的防腐性能,结果表明:预分散工艺改善了石墨烯的分散性,0.8%石墨烯掺量下的石墨烯-环氧锌粉复合防腐涂料具有最佳的腐蚀防护性能,耐盐雾时间达到2 000 h,同时由于石墨烯的加入,涂层耐冲击性和附着力都得到增强。     

硅烷偶联剂改性氧化石墨烯增强环氧树脂复合涂料的防腐性能

采用简单的一步水热法制备了硅烷偶联剂功能化氧化石墨烯(KGO),并将其与环氧树脂复合，制备了一种高性能的防腐涂料。采用傅里叶变换红外光谱、拉曼光谱、扫描电子显微镜和X射线衍射分析对KGO的各项性能及微观形貌进行了表征。随后通过电化学阻抗谱(EIS)和盐雾试验对添加了质量分数为0.1%、0.2%和0.3%的环氧树脂复合涂料的耐腐蚀性能进行表征。结果表明，KGO显著提高了环氧树脂复合涂层的屏蔽性能和耐腐蚀性能。环氧树脂复合涂层腐蚀电流密度由8.8×10^-8 A·cm^-2最低下降到2.0×10^-8 A·cm^-2。其中，0.2 KGO/EP涂层的低频阻抗模量在浓度为3.5%的NaCl溶液中浸泡72 h后仍维持在较高水平，约高出纯环氧树脂涂层2个数量级。当KGO的添加量为0.2%时，环氧树脂复合涂层具有最优异的耐腐蚀性能。     

原位改性石墨烯在防腐涂料中的应用

对比了自制原位改性石墨烯与普通石墨烯的分散稳定性,采用自制原位改性石墨烯研制了一种防腐蚀涂料,并对涂层综合性能进行了测试。通过原位改性石墨烯掺量对涂层力学性能、耐盐雾性能、导电性能的分析,确定了最佳用量。研究结果表明:当原位改性石墨烯含量为0.3%时,制备的原位改性石墨烯防腐涂料具有优异的综合性能和较高的性价比;当原位改性石墨烯含量为0.4%时,制备的原位改性石墨烯防腐涂料可用于静电防腐领域。     

石墨烯与氧化石墨烯增强富锌环氧涂层防腐性能的研究

研究了三种不同锌粉含量的富锌环氧底漆的腐性能,包括厚度、硬度、附着力等物理测试,比较了这三种不同锌粉含量的耐盐雾性能的差异。从而在这三种不同锌粉含量的环氧漆中选择出一种,用以进行后续的实验研究。其次,我们研究了氧化石墨烯(GO)增强富锌环氧涂层的防腐性能,包括物理性能的测试、电化学性能的测试和耐中性盐雾测试。最后,我们研究了石墨烯(G)增强富锌环氧涂层的防腐性能,同样对添加石墨烯的复合涂层进行了物理测试、电化学测试和耐中性盐雾测试。并对氧化石墨烯/富锌环氧复合涂层(GO/Zn)和石墨烯/富锌环氧复合涂层(G/Zn)的防腐性能进行了对比。发现,添加石墨烯的复合涂层(G/Zn)性能比添加氧化石墨烯的复合涂层(GO/Zn)好,且在石墨烯含量为1%时防腐性能最好。     

石墨烯的分散及其在防腐涂层中的应用

以生物基没食子酸(GA)为原料,在碱性条件下与环氧氯丙烷(ECP)发生环氧化反应,合成了没食子酸基环氧树脂(GEP)。GEP作为石墨烯分散剂,能够将石墨烯稳定地分散在有机溶剂中,其分散浓度高达5 mg/m L,采用TEM和AFM对石墨烯的分散状态和层数进行了表征。将分散后的石墨烯以0.5%的质量分数,添加到双组分环氧树脂涂料中,制备了石墨烯环氧复合涂层(GEP-G0.5/EP)。利用Tafel极化曲线、涂层吸水率和中性盐雾测试对涂层防腐性能进行表征。结果表明:相比于纯环氧涂层,GEP-G0.5/EP涂层的极化电阻和耐盐雾性大大提高,涂层吸水率下降0.22%。     

石墨烯光固化涂料的制备及防腐性能研究

为了提高光固化涂料的耐腐蚀性，将不同质量分数的石墨烯添加到光固化涂料中，制备了石墨烯复合光固化防腐涂层。对不同含量石墨烯复合光固化防腐涂层的硬度、耐冲击性、附着力等物理性能进行测试，并通过极化曲线、电化学阻抗谱等对其电化学性能进行了研究。最后，采用盐雾试验对不同石墨烯添加量的光固化涂层的防腐性能进行了评价。结果表明：当石墨烯的添加量为 0.1%时，涂层的硬度、耐冲击性以及附着力等物理性能得到显著增强，此时涂层的腐蚀电位最高，腐蚀电流密度最低，具有优异的耐腐蚀性能。     

三聚磷酸铝/氧化石墨烯复合材料在水性防腐涂料中的应用

采用球磨分散法制备得到三聚磷酸铝/氧化石墨烯水性复合防腐浆料(AlTP/GO),并与水性环氧树脂复配制得纳米复合防腐涂料(EP-AlTP/GO)。通过场发射扫描电镜(FE-SEM)观测到AlTP/GO可均匀分散到EP树脂内部。吸水率测试结果表明,氧化石墨烯的引入提高了涂层的耐水性和屏蔽性能;附着强度测试结果表明,三聚磷酸铝可提高涂层在金属基材上的附着强度;电化学测试(Bode)和环境扫描电镜测试(E-SEM)结果表明,AlTP/GO可有效增强水性环氧涂层对腐蚀介质的屏蔽作用,限制了腐蚀反应的扩散,在3.5%NaCl水溶液中浸泡40 d后其低频阻抗达到7.02×10~7Ω·cm~2,盐雾测试400 h后金属表面平滑,金属腐蚀未发生明显扩散,EP-AlTP/GO人工破损处周边含氧量低至15.66%,遏制了氧化铁的形成。     

石墨烯掺杂水性环氧树脂的隔水和防护性能

通过物理混合将自制的石墨烯分散液与双组分水性环氧树脂制备成石墨烯环氧树脂。用扫描电镜(SEM)考察了石墨烯在水溶液中的分散情况。通过极化曲线、交流阻抗谱和中性盐雾试验探讨了含0.5%石墨烯的E44水性环氧涂层(0.5%G-E44)在模拟海水溶液中的隔水和耐腐蚀性能并与纯环氧涂层E44进行比较。结果表明:石墨烯在水溶液中分散良好,其在水性环氧树脂中层层叠加,形成了致密的物理隔绝层,减缓了水分子在涂层中的扩散速率,拥有较好的隔水性能。E44和0.5%G-E44涂层在浸泡初期的Fick扩散系数分别为5.56×10-9 cm2/s和1.61×10-11 cm2/s。添加石墨烯明显提高了水性环氧树脂涂层的防护效果,自腐蚀电流密度减小,涂层电阻和电荷转移电阻增大,200 h中性盐雾试验后涂膜平整,无明显腐蚀。     

噻二唑改性石墨烯在磁体表面Zn-Al涂层中的应用

用噻二唑衍生物改性氧化石墨烯,然后与锌铝涂料共混,在烧结NdFeB表面制备含改性石墨烯的耐磨锌铝涂层。通过SEM电镜观察涂层表面形貌,发现改性石墨烯的加入使得Zn、Al片间空隙减少,提高了涂层的致密性。通过电化学工作站和盐雾试验观测涂层的耐蚀性,结果表明,添加有改性石墨烯的Zn-Al涂层的电流密度较未添加改性石墨烯的涂层降低50%,其耐盐雾由360 h提高到800 h。改性石墨烯的添加使Zn-Al涂层PCT性能从240 h提高到500 h,摩擦系数由0.42降低为0.20。最终通过改性石墨烯的添加,得到具有更优耐蚀效果的耐磨Zn-Al涂层。     

石墨烯改性环氧锌基防腐涂料的制备与性能研究

针对传统环氧富锌涂料环保性差、质量大、成本高等问题,利用石墨烯优异的导电性与独特的二维片层结构可增强涂层防腐性能的特性,取代传统环氧富锌涂料中的部分锌粉,以期制备低锌含量的石墨烯环氧锌基涂料。首先将石墨烯材料与环氧树脂预混合,掺杂天然高分子表面活性剂,制备一种高分散性石墨烯 /环氧树脂浆料;然后将其与计量的环氧树脂、锌粉、其他功能颜填料复配,通过高速分散与砂磨的制备方式相结合,得到石墨烯改性环氧锌基防腐涂料;最后通过力学性能、连接强度、交流阻抗、耐中性盐雾等方法探索涂层关键性能。研究结果表明：该石墨烯涂层防腐性能优异, 2 000 h盐雾划痕腐蚀扩展 0.9 mm,且力学性能与施工性能好,可广泛应用于船舶、海工设备、桥梁等大型钢结构装备领域。     

Incorporation of silica network and modified graphene oxide into epoxy resin for improving thermal and anticorrosion properties

In this study, the silica network and functionalized graphene oxide (GO) were incorporated into the epoxy coating systems, which was aimed to improve the thermal property and corrosion resistance of epoxy coatings. First, tetraethyl orthosilicate (TEOS) oligomers and epoxy hybrid was fabricated through sol–gel method. Then the (3-aminopropyl) triethoxysilane (APTES) modified graphene oxide (FGO) was added into the epoxy hybrid composite to obtain anticorrosion coatings. Fourier transform infrared spectroscopy, thermogravimetric analysis (TGA), Raman spectrum, and X-ray photoelectron spectrum were conducted to evaluate the structural information of GO and APTES modified GO nanosheets. The results indicated that the APTES successfully grafted onto the surface of GO sheets. Besides, TGA curves, electrochemical measurements and salt spray test were also carried out to characterize the thermal performance and corrosion resistance of GO based epoxy coatings. The TGA results revealed that the thermal performance of epoxy coating containing silica network and FGO nanofiller (ES/FGO) was significantly strengthened compared to pure epoxy. The initial degradation temperature of epoxy coating was increased from 300 to 343.7°C after incorporation of silica component and FGO. The EIS measurements demonstrated that the impedance modulus of ES/FGO was significantly higher than neat epoxy, which indicated that the corrosion resistance of epoxy was substantially strengthened after introduction of silica component and FGO. The corrosion rate and inhibition efficiency of epoxy composite coatings were also shifted from 1.237 × 10⁻⁷ mm/year and 76.6% (for neat epoxy) to 1.870 × 10⁻⁹ mm/year and 99.6% (for ES/FGO), respectively. The salt spray test also revealed that the silica and FGO can improve the corrosion resistance of epoxy coating. Additionally, the dispersion of GO sheets was also enhanced after the modification of APTES siloxane.     

咪唑啉季铵盐缓蚀剂改性蒙脱土/水性环氧纳米复合涂料

以油酸、二乙烯三胺和氯化苄为原料,合成了咪唑啉季铵盐缓蚀剂。通过FT-IR、₁^H-NMR对季铵盐结构进行了表征。并将其离子交换至钠基蒙脱土(DK0)层间,制备缓蚀剂改性有机蒙脱土QACDK0。通过XRD,TGA和UV-Vis对QACDK0的结构、组成及层间缓蚀剂释放性能进行了表征,结果表明季铵盐缓蚀剂的插入使蒙脱土层间距由12.8 ?扩大到39.8 ?,蒙脱土中缓蚀剂负载量约为39.0 wt%。为研究在同种基质中使用不同纳米粘土对水性环氧涂层防腐性能的影响,将缓蚀剂改性有机蒙脱土、无机蒙脱土及市售普通有机改性蒙脱土加入到环氧树脂E-51中,通过相反转法制备了水性环氧树脂/蒙脱土纳米复合乳液。利用DLS和Zeta电位对环氧乳液的稳定性进行表征,其中咪唑啉季铵盐缓蚀剂改性蒙脱土/环氧乳液Zeta电位为-27.8 mV,稳定性最高。电化学阻抗谱(EIS)测试表明,在腐蚀介质中浸泡30天后,基于QACDK0制备的防腐清漆漆膜阻抗模值仍保持最高,具有2.29×10₈ ^Ohm.cm₂^的高阻抗值,表明季铵盐缓蚀剂的释放使涂层具有更好的主动防腐性能。在耐中性盐雾测试中,QACDK0对应的防腐色漆耐盐雾时间更长,验证了该涂层具有良好的耐盐雾性能。此外,该涂层表面平整致密,具有良好的阻隔性能。     

Superior anticorrosion performance of epoxy-based composites with well-dispersed melamine modified graphene oxide

In order to improve the dispersion of graphene in epoxy resin, the preparation of melamine modified graphene oxide (M-rGO) is reported. The π-π interaction between melamine and graphene oxide (GO) sheet is confirmed via ultraviolet–visible spectroscopy, Raman spectroscopy, and X-ray photoelectron spectroscopy analysis, which endows M-rGO with well dispersion. The dispersion concentration of M-rGO in dimethyl sulfoxide is up to 9 mg/ml, and the stability of which keeps more than 18 months. The anticorrosion performance of M-rGO/epoxy composite coatings was analyzed through electrochemical measurements and salt spray tests, these results indicate that M-rGO has a good barrier effect on corrosive medium and even can replace zinc powder in zinc-rich epoxy. In addition, the reinforced mechanical strength of M-rGO/epoxy composite coatings is proved via mechanical strength tests.     

颜料体积浓度对水性环氧防腐涂料性能的影响

考察了颜料体积浓度对水性环氧防腐涂料性能的影响，通过电极电位监测、盐雾实验和交流阻抗谱等测试技术对不同颜料体积浓度的试样进行了性能检测，根据不同涂层的阻抗谱特征以及涂层的结构特点，提出了浸泡45d后涂层阻抗谱的等效电路模型，确定了该水性环氧防腐涂料的最佳颜料体积浓度。     

不同腐蚀试验的电化学阻抗谱评价

采用电化学阻抗谱分析了环氧涂层的介质浸泡、ASTM-B117盐雾试验、PROHESION循环试验的性能变化。实验结果表明:介质浸泡更侧重考察涂层的屏蔽作用,对环氧-聚酰胺体系酸性电解质更容易导致涂层失效;而盐雾试验更容易导致涂层吸收水分,干湿交替增加了有机涂层吸水能力;划痕试验表明样板在ASTM-B117和PRO-HESION遵循不同的腐蚀机理。     

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。     

High performance polyaniline containing coating system for wet surfaces

Application of paint coatings on wet surfaces is rather difficult due to poor adhesion of coatings. For painting of wet surfaces, moisture curable coating systems based on epoxy resin and ketimine are found to be useful. Hence a study has been made on the corrosion protection ability of coating on wet surfaces using epoxy resin, ketimine and polyaniline. Paints with 20–30% PVC were prepared and applied over the wet steel surface and the corrosion protection performance of the coating was found out by salt spray and electrochemical impedance spectroscopic techniques. Coating with 20% PVC is found to offer very high protection since the impedance values are remained at greater than 10⁹ Ω cm² after immersion and salt spray tests.     

改性环氧富锌底粉在高耐盐雾锈蚀方面的研究

防腐型熔结环氧粉末涂料与富锌环氧粉末涂料应用多年,但在很多高耐盐雾锈蚀环境仍无法完全替代溶剂型涂层。为提升粉末涂料耐盐雾性能,本研究通过对环氧富锌粉末涂料进行改性,在降低涂层体积电阻率的基础上提升牺牲阳极效率,使涂层达到液体涂料耐盐雾等级性能。结果表明：添加 0. 2%导电材料单壁碳纳米管与 30%片状锌粉以及其他功能助剂,最终制备涂层的 1 500 h中性盐雾单边锈蚀可控制在 1 mm以内,涂层综合性能也可达到液体富锌涂层指标,在一些环境可替换液体富锌涂层。     

Designing of corrosion resistant epoxy coatings embedded with polypyrrole/SiO2 composite

Polypyrrole/SiO₂ composite was synthesized by chemical oxidative polymerization of pyrrole using FeCl₃. The synthesized polymer composite was loaded in epoxy resin to develop coatings for mild steel substrates using powder coating technique. SEM and TEM images reveal homogenous dispersion of SiO₂ particles in polypyrrole matrix. TGA analysis confirms good thermal stability of the polymer composite. Tafel polarization and electrochemical impedance spectroscopy (EIS) results exhibit remarkably high corrosion protection efficiency of epoxy coatings with polymer composite in 3.5% NaCl solution. Corrosion studies of coatings with an artificial defect reveal the passivation of defect by the polymer composite present in the epoxy coatings. Salt spray test results revealed superior corrosion resistance offered by the polymer composite.