环氧磷酸酯/水性环氧涂层的耐蚀性能

为研究水性环氧涂层缓蚀剂的制备及其耐蚀性能,采用化学法将磷酸接到双酚A环氧树脂上,并与N,N-二甲基乙醇胺中和制备水性环氧磷酸酯。将环氧磷酸酯添加到双组份水性环氧树脂中制备3种环氧磷酸酯/水性环氧涂层(E44,0.2%P-E44和0.5%P-E44)。采用极化曲线和交流阻抗谱技术研究了环氧磷酸酯/水性环氧树脂对Q235钢基体在3.5%NaCl溶液中的防护性能。结果表明:浸泡24h后,0.2%P-E44/碳钢体系的自腐蚀电流密度(0.431μA/cm2)低于E44/碳钢体系(0.928μA/cm2)和0.5%P-E44/碳钢体系(0.553μA/cm2);在浸泡24h内,3种涂层的涂层电容Qc逐渐增大,涂层电阻Rc和电荷转移电阻Rct逐渐较小,环氧磷酸酯可以显著提高纯水性环氧的Rc和Rct,进而提高水性环氧的耐蚀性能。当水性环氧树脂中环氧磷酸酯的含量为0.2%时,其防护性能较好。     

硅烷偶联剂改性磷酸锌对环氧涂层防腐性能的影响

采用硅烷偶联剂(KH560)对微纳米片状磷酸锌(SZP)表面进行有机改性制备硅烷偶联剂改性微纳米片状磷酸锌(KH560-SZP),并通过红外光谱(FT-IR),扫描电子显微镜(SEM),电子能谱(EDS)等手段对KH560-SZP进行表征;采用电化学阻抗谱(EIS)、附着力测试、表面形貌观察等方法,研究了KH560-SZP在环氧涂层中分散性状态及KH560-SZP环氧涂层的防腐蚀性能。结果表明:经过改性后的磷酸锌表面覆盖一层固化交联的硅烷交联聚合物,能够在环氧树脂中高效分散,从而提高涂层的屏蔽性能和附着力,进而综合提高涂层防腐蚀性能。     

环氧防腐涂料在模拟海水干湿交替条件下的失效过程

用电化学阻抗谱(EIS)、附着力测试、Fourier红外光谱(FT-IR)和扫描电镜(SEM)等分析手段研究了环氧防腐涂层在干湿交替及全浸泡环境下的失效过程。结果表明,干湿交替环境中环氧防腐涂层前期的防护效果较好,涂层后期失效快于全浸泡环境下的失效速率;环氧防腐涂层在干湿交替环境下失效的原因是由于涂层交替的吸水和失水过程使得涂层孔隙率增大,对涂层造成机械损坏,使得涂层内部及表面开裂,最终导致附着力降低,涂层大面积起泡失效。     

聚合物/达克罗复合涂层体系在3.5%NaCl中耐蚀性能的EIS研究

通过EIS研究了以碳钢为基体的醇酸、聚氨酯、苯丙乳液以及氟树脂4种有机聚合物/达克罗复合涂层体系在3.5%NaCl中的防护性能.结果表明,氟树脂/达克罗复合体系表现出最好的防护性能,水性的苯丙乳液体系次之,聚氨酯体系居中,醇酸体系最差.γ-氨基丙基三乙氧基硅烷(γ-APS)对达克罗涂层表面进行预处理可较大程度地提高醇酸、聚氨酯复合体系的耐蚀性能,但降低了水性的苯丙乳液体系的防护性能,对氟树脂体系的影响不明显.     

环氧粉末涂层在1.5mol/LNaCl溶液中的失效行为

通过电化学阻抗谱(EIS)对两种环氧粉末涂层在1.5 mol/LNaCl溶液中的失效行为进行了研究,利用扫描电子显微镜(SEM)和能谱仪(EDS)对涂层底部金属表面的腐蚀产物进行了分析,探讨了环氧粉末涂层在1.5 mol/L NaCl溶液中的失效机理。结果表明,在1.5 mol/L NaCl溶液中,Cl-等腐蚀介质能在涂层中形成传输通道渗透到涂层与金属界面,并参与界面的腐蚀反应,腐蚀产物主要为Fe的氧化物和氯化物。     

高导热物质对水性环氧富锌涂料腐蚀行为的影响

通过电化学阻抗谱(EIS)研究了高导热物质对水性环氧富锌涂层防腐蚀性能的影响。采用3D激光显微镜对EIS试验后试样的表面形貌和粗糙度进行了分析,采用盐雾试验进一步分析了含不同量高导热物质涂层的防护性能。结果表明：高导热物质添加量为1%～4%时,涂层孔隙率低,浸泡初期具有优异的抗渗性能;高导热物质添加量为8%的涂层孔隙率较高,阻抗值较低,粗糙度较大,防护性能较差;高导热物质添加量为1%的涂层具有最为优异的防腐蚀性能。     

BTA@SPANI-POSS环氧涂层的制备及防腐性能

为提高环氧涂层在腐蚀环境下的防腐性和持久性,合成一种负载有缓蚀剂苯并三唑(BTA)的苯并三唑@磺化聚苯胺功能化倍半硅氧烷(BTA@SPANI-POSS),随后将BTA@SPANI-POSS与环氧树脂共混得到BTA@SPANI-POSS环氧涂料,最后在Q235碳钢上制备数种复合环氧涂层。通过红外光谱、紫外可见光谱、扫描电子显微镜对BTA@SPANI-POSS的结构、缓蚀性能、表面形貌进行表征,利用接触角测量仪、电化学工作站研究所制备涂层的疏水性能和防腐性能。研究表明,随着SPANI-POSS的添加,涂层沾湿性能降低。电化学阻抗谱(EIS)和塔菲尔极化曲线测试结果表明,与SPANI-POSS环氧涂层相比,负载有BTA的BTA@SPANI-POSS环氧涂层对金属基底具有更高和更持久的保护能力,其中试样EB1.5%的腐蚀电流密度icorr为16.67?A·cm^-2,其极化电阻Rp为2.467 M?·cm²,具有较低的腐蚀动态速率。在3.5 wt.%NaCl溶液中浸泡15 d后环氧涂层仍具有良好的防腐蚀效果,其阻抗值Z0.01Hz仍保留有第1 d时的2...     

添加纳米锌粉环痒涂层腐蚀电化学行为

用电化学阻抗谱(EIS)技术研究了添加不同质量 百分比浓度的纳米锌粉环氧涂层的腐蚀电化学行为，并与环氧清漆(不含颜料)涂层的腐蚀电化学行为进行对比.结果表明，添加不同质量百分比浓度纳米锌粉环氧涂层与环氧清漆涂层具有不同的电化学阻抗谱特征.纳米锌粉的添加量对涂层的防护性能有显著影响，添加不同质量百分比浓度纳米锌粉环氧涂层防腐蚀性能的优劣顺序为：环氧清漆涂层>20mass%>10mass%>2mass%纳米锌环氧涂层.添加纳米锌粉对环氧涂层的防护性能有2方面的影响：一方面使涂层中的微观缺陷大大增多，涂层的防护性能降低；另一方面，由于锌粉的腐蚀产物可将涂层中部分缺陷堵塞，从而对涂层的防护性能有提高作用.由于在所研究的质量百分比浓度范围内(2mass%～20mass%)，前者起了主导作用，所以综合作用的结果是使涂层的防护性能变差.  s.     

Ti纳米粒子对环氧涂层防护性能的影响

应用电化学阻抗法(EIS)、示扫描量热法(DSC)、X射线光电子谱(XPS)研究了添加Ti纳米粒子对环氧涂层防护性能的影响.结果表明:添加Ti纳米粒子可以提高环氧涂层的防护性能,添加量在0.5%(以w/w计)时最好.这是由于添加Ti纳米粒子虽然可增加涂层孔隙率,但Ti纳米粒子与环氧树脂之间存在的相互作用可改善涂层对腐蚀性介质的屏蔽性能,提高涂层的防护性能.     

表面改性水滑石的制备及其耐腐蚀性能研究

通过水热合成法制备一种硝酸根插层的Zn-Al水滑石,利用静电作用在水滑石表面沉积聚天冬氨酸,以其作为交联剂与缓蚀剂三价铈离子络合,完成对水滑石表面的改性;将改性后的Zn-Al水滑石分散在双组分水性环氧涂层中。扫描电子显微镜 (SEM) 和X射线衍射 (XRD) 的表面形貌和晶体结构分析、ζ电势测试以及EIS阻抗谱测试结果表明,表面改性后的水滑石应用于环氧涂层中能够起到明显的自修复效果,并能提高涂层的耐腐蚀性能。     

环氧铝粉涂层和氟碳涂层耐蚀性能的比较

采用电化学阻抗谱技术(EIS)研究了环氧铝粉涂层和FEVE氟碳涂层/碳钢体系在天然海水介质中的电化学腐蚀行为,通过对两涂层的涂层电容分析及腐蚀后表面形貌的观察,评价了两种有机涂层的防腐蚀性能。结果表明,随着浸泡时间的延长,两种有机涂层体系的保护作用都有所降低。环氧铝粉涂层在浸泡初期呈现单容抗弧特征,浸泡57天时出现了双容抗弧。氟碳涂层在浸泡周期内EIS曲线均呈现单容抗弧特征,浸泡110天时低频阻抗模值仍高于108Ω.cm2。在整个浸泡周期内,氟碳涂层的涂层电容基本维持在1.6×10-10～1.8×10-10 F.cm-2,约为环氧铝粉涂层电容的1/20,表现出低渗水性。     

水性聚氨酯的合成及可剥涂料的性能研究

目的以水性聚氨酯为主要成膜物质,制备一种耐水性良好且涂层整体可剥的保护涂料。方法首先采用正交法分析水性聚氨酯的合成工艺,并通过测试红外图谱、存储时间、外观及耐水性,分析三乙胺和H2O含量对产物性能的影响。再以合成产物为基料,加入固化剂聚碳化二亚胺及其他助剂制备水性涂料,通过测试邵氏硬度、附着力、拉伸强度、断裂伸长率、剥离强度及耐水性,分析该水性涂料的可保护性和可剥性。结果红外图谱表明成功合成了水性聚氨酯,得出了自乳化型水性聚氨酯的最佳合成工艺。涂料工艺性和涂层的综合性能良好,涂层可以一次性整体剥离。该涂层附着力为4B,具有良好的耐水性,在室温水中浸泡48 h后,质量基本不变,拉伸强度由37.7 MPa变为33.6 MPa,断裂伸长率由540%变为510%,邵氏硬度仍为82HA。结论聚碳化二亚胺和其他助剂的加入使得涂层具有良好的可剥性和耐水性,且涂层硬度为82HA,对基材能起到一定的保护作用。     

Effect of nano-Fe2O3 particles on the corrosion behavior of alkyd based waterborne coatings

A nano-composite coating was formed by adding nano-Fe₂O₃ to a specially developed alkyd based waterborne coating system. The interaction of nano-particles with the polymer functionalities was confirmed using FTIR. Curing behavior of the coating was determined by DSC. The uniformity of coating and dispersion of nano-particles in the polymer matrix was investigated using SEM and AFM. The performance of the coating was investigated in terms of their corrosion resistance, UV-resistance, mechanical properties and optical properties. Composite coatings so formed showed enhanced, corrosion resistance, better mechanical properties such as abrasion and scratch hardness and improved UV blocking properties.     

P/B对水性聚氨酯防腐蚀涂料性能影响研究

以水性聚氨酯为基料,加入颜填料和助剂合成水性防腐蚀涂料。改变涂料配方中颜填料和基料的质量比(P/B),在不锈钢板上制得涂层样品,通过极化曲线和电化学阻抗测试,讨论P/B对涂层腐蚀性能的影响,试验结果表明,涂料配方中P/B=0.8和1.5时涂层综合性能较好。     

航空有机涂层的老化失效规律和电化学表征

利用扫描电镜、红外光谱分析技术,对海洋大气环境下暴露不同周期的多层涂层体系的老化过程进行了研究,并采用外观综合评级和电化学交流阻抗(EIS)对涂层的防护性能进行了表征.研究表明:随着暴露时间的延长,涂层老化降解,羰基指数下降,涂层宏、微观缺陷增大.因暴露产生不同程度损伤的涂层,其阻抗谱呈现阶段性变化,提出的等效电路模型...     

Preparation of epoxy microcapsule based self-healing coatings and their behavior

In this paper, epoxy microcapsules were prepared by interfacial polymerization of epoxy resin droplets with ethylenediamine (EDA), and the capsules were characterized by scanning electron microscope (SEM). Then, the coatings containing epoxy microcapsules were applied on carbon steels, and their behavior and self-healing effect were investigated by electrochemical impedance spectroscopy (EIS) technique and SEM observation. The experimental results demonstrate that the artificial scratches were successfully healed in about 4-h after made. Furthermore, coating prepared from 20 wt.% epoxy microcapsules shows the best performance among all the prepared coatings.     

石墨烯水性复合防腐涂料的研究进展

石墨烯复合防腐涂料因兼顾石墨烯优异的化学稳定性、快速的导电性、突出的力学性能和聚合物树脂的强附着力、良好成膜性等优点,受到越来越多涂料防护工作者的关注。然而,目前石墨烯复合防腐涂料的研究主要以溶剂型复合材料为主,环保性差。加快石墨烯在水性防腐涂料中的应用研究,开发低成本、高性能、绿色环保的新型石墨烯水性复合防腐涂料,成为未来石墨烯防腐蚀涂层材料的研究热点。对石墨烯在水性聚氨酯防腐涂料、水性环氧树脂防腐涂料、水性丙烯酸防腐涂料以及水性无机富锌涂料中的功能化应用进行介绍,将石墨烯添加到水性防腐涂料中可以增强涂层对基材的附着力,提升涂料的物理屏蔽性、耐磨性和防腐性,同时具有环保安全的特性,大大扩大了水性防腐涂料的应用范围。另外,对石墨烯水性复合防腐涂料功能化应用研究所面临的重点、难点进行了分类介绍,包括石墨烯选材、石墨烯与水性涂料的配套体系研究、石墨烯用量以及石墨烯在水性涂料中的分散性和相容性。     

Effect of inorganic constituent on nanomechanical and tribological properties of polymer,quasi-ceramic and hybrid coatings

This study investigates the variations in nanomechanical properties of coatings made of a pristine polymeric backbone and those containing silicone segments. Four different coatings with varying degrees of inorganic segments were prepared and analyzed. The four coatings were 1) a pure epoxy polymer coating, 2) a hybrid coating consisting of epoxy and silicone, 3) a ceramer coating consisting of organo-silicone and 4) a quasi-ceramic coating consisting of specialty silicone composition. The molecular bonding characteristics of the coatings were characterized with FTIR spectroscopy. The coatings were also tested using nanoindentation and nanoscratch methods to investigate mechanical and tribological properties. The scratched surface was investigated using scanning electron microscopy and atomic force microscopy. The hybrid coating displayed superior nanomechanical properties compared to the pure polymer coating, and the coating containing high silicone levels displayed better hardness. Atomic force microscopy showed that the epoxy-based polymer coating consisted of a smooth surface that was compressed when scratched using a nanoindenter. The hybrid coating had rough surface that was damaged and partially recovered after the scratch test. The ceramer and quasi-ceramic coatings displayed brittle failure.     

The role of zinc aluminum phosphate anticorrosive pigment in Protective Performance and cathodic disbondment of epoxy coating

Protective performance and cathodic disbondment of epoxy coating pigmented with zinc aluminum phosphate (ZPA) were studied in this work. In solution, superior corrosion inhibition of ZPA extracted from EIS and electrochemical noise data was connected to deposition of a protective layer. EIS evaluation of the pigmented coatings indicated significant effect of modification of zinc phosphate on the protective performance as well as resistance to cathodic disbonding. Compared to ZPA, introduction of zinc phosphate resulted in inferior performance in cathodic disbonding test. In presence of ZPA, precipitation at disbonding front inferred from EIS data was confirmed by SEM.     

Effect of polyaniline–montmorillonite nanocomposite powders addition on corrosion performance of epoxy coatings on Al 5000

A series of polyaniline (PANI)/montmorillonite (MMT) nanocomposite materials has been successfully prepared by in-situ emulsion polymerization in the presence of inorganic nanolayers of clay with camphorsulfonic acid (CSA) and ammonium peroxydisulfate (APS) as surfactant and initiator, respectively. The nanocomposite materials were characterized by Fourier Transformation Infrared (FTIR) spectroscopy, X-ray diffraction (XRD) and scanning electron microscopy (SEM). Epoxy resin was used as a binder for the nanocomposites in order to obtain a thick and uniform coating. In order to understand the effect of MMT and PANI on the corrosion inhibition performance of the epoxy coatings in 3.5% saline solution at 65 °C, the epoxy (E), epoxy blend with polyaniline (EP), epoxy blend with polyaniline and MMT (EPM) coatings were investigated by electrochemical impedance spectroscopy (EIS). The results showed that EPM coatings with 5% clay on pretreated aluminum by anodizing were much superior in corrosion protection, with respect to the other samples. Incorporation of PACN nanocomposites inside the epoxy significantly increases the resistance of the coating in comparison to the other coatings in 3.5% saline solution at 65 °C. These phenomena can be attributed to specific morphology of the nanocomposite.