纳米填料对环氧涂料防腐耐磨性能影响的研究

环氧树脂由于其本身的附着力强,耐化学药品性和耐磨性也很好,所以被广泛应用于防腐涂料上.但是由于其自身脆性等缺点,在使用中通常需要时其进行改性处理.其中,各种纳米粉体对环氧树脂的改性得到了广泛的关注,对于提高环氧涂料的耐腐蚀性和耐磨性等性能发挥了重要作用.主要综述了纳米粉体在提高环氧树脂涂料的防腐性和耐磨性等方面的研究进展,介绍了纳米粉体分散改性的先进方法和表征手段,对纳米填料应用于重防腐耐磨环氧涂料的发展进行了展望.     

Incorporation graphene into sprayed epoxy–polyamide coating on carbon steel: corrosion resistance properties

In this study, the graphene incorporated into epoxy–polyamide coatings were successfully obtained on carbon steel substrates by spraying process. The corrosion resistance properties of the coatings were investigated, including salt spray corrosion, sea water corrosion and electrochemical corrosion resistance. The results show that the addition of graphene could improve the corrosion resistance properties of the epoxy–polyamide coatings. The coatings in the presence of graphene had better salt spray corrosion than that in the absence of graphene. The surface of the epoxy–polyamide coating exhibited lots of pitting corrosion. The coatings with the addition of graphene showed better sea water corrosion than the coating without graphene. After drying, the epoxy–polyamide coating in the absence of graphene was broken and failed. The coating with 1?wt-% graphene exhibited the best anticorrosion capability as evidenced by the highest corrosion potential and the lowest corrosion current density. The graphene incorporated into epoxy–polyamide coatings were shown to effectively protect carbon steel against corrosion because the graphene nanosheets could be acted as the good chloride ions, oxygen and water molecules barrier.     

Study on corrosive electrochemical behaviors of zinc‐rich and graphite‐filled epoxy coatings in 3.5 wt% NaCl solution

Environment behaviors and degradation mechanisms of two organic epoxy coatings coated on carbon steel sheets in 3.5 wt% NaCl neutral solution were studied by electrochemical impedance measurements and atomic force microscopy (AFM). The results showed that the coating resistance (R_p) of the graphite‐filled epoxy coating tested, which presents the film barrier performance, is higher than those of 6101 epoxy resin for initial seawater immersion, but the coating resistance of the zinc‐rich epoxy coating was lower than that of 6101 epoxy resin. After salt spray tests, zinc‐rich epoxy coating coated on the metal still has good anti‐corrosion performances due to the existence of protection effects called “electrochemical” and “chemical” protection. Those behaviors and degradation mechanisms of two coatings can be explained by a series of measured electrochemical impedance spectroscopy measurements, and two equivalent circuit models were proposed to explain the degradation processes of the two organic coatings.     

模拟流动海水条件下无溶剂环氧防腐涂层的失效行为

在60 ℃实验条件下以3种无溶剂环氧防腐涂层为研究对象,利用称重法研究了在不同流速3.5%NaCl溶液中水在涂层中的扩散行为,采用开路电位法 (OCP) 和电化学阻抗谱技术 (EIS) 研究了不同流速下涂层的失效行为。结果表明,胺类固化粉末涂层和酚醛固化粉末涂层在实验流速范围内、酚醛胺固化液体涂层在较低流速范围内,水在涂层中的扩散符合Fick II模型,而酚醛胺固化液体涂层在4 m/s高流速下水在涂层中的扩散偏离Fick II模型;随着流体流速增加,涂层的饱和吸水量增加,水在涂层中的扩散系数变大;实验流速范围内3种无溶剂涂层失效过程分为3个阶段;流体流速明显加速了酚醛固化粉末涂层和酚醛胺固化液体涂层的劣化,对胺类固化粉末涂层失效影响不明显。     

海洋风电重防腐涂料环氧玻璃鳞片的性能研究

目的研究重防腐涂料环氧玻璃鳞片耐蚀耐磨性能。方法对环氧玻璃鳞片与其它3种环氧类涂层进行磨耗实验,通过紫外线老化、低温暴露和盐雾等系列力学和耐腐蚀性能检测,研究环氧玻璃鳞片的耐腐蚀性能。结果各涂层都符合磨损性能指标(1000转的磨耗量小于1.8 g),环氧玻璃鳞片的耐磨性比环氧树脂涂层较差,但是比另外两种环氧类涂层耐磨性都好;耐蚀循环2400 h后,4种不同环氧类涂层表面均出现粉化、锈点,变色明显;环氧玻璃鳞片的结合力好于其他3种达到6.7 MPa,并且划线处的起泡数目最少,单边扩蚀只有2.5 mm,失光率最小。结论环氧玻璃鳞片涂层中由于鳞片的层状分布,延缓了腐蚀介质的渗透,具有良好的耐磨耐蚀性能,可以作为一种高效的重防腐涂料,应用于海洋、船舶等环境中。     

Electrochemical characterisation of electrodeposited organic coatings

The electrochemical impedance spectroscopy and the potentiostatic polarization techniques have been used to characterize the organic coatings electrodeposited on carbon steel. The coatings were formed during the cathodic and anodic electrodeposition of the modified epoxy resins on carbon steel samples previously polished and degreased (no primer was used). The experiments were conducted in stagnant, natural aerated 3% NaCl solution under ambient conditions. Analysis of the impedance spectra has established that an electrical equivalent circuit with two time constants fits to describe the electrodeposited epoxy coating/carbon steel system in the electrolyte solution. For the characterisation of the electrodeposited epoxy coatings the physical properties obtained from the principal elements of the equivalent electrical circuit and the electrochemical parameters obtained from the anodic polarization curves were used. It was established that these coatings present good performances characterized by low porosity, low water uptake and few conductive pathways and therefore a high efficiency. The coatings present a good adhesion to the carbon steels substrate; during the exposure period (60 days), no degradation or delamination process could be observed.     

纳米SiO2改性环氧涂层的防腐性能

用电化学阻抗谱法(EIS)研究纳米SiO2改性环氧涂层在3.5%NaCl(质量分数)水溶液中的腐蚀规律,结合电容法和重量法分析改性涂层的吸水行为.结果表明,添加纳米SiO2可明显改善涂层的防腐性能,添加质量分数为2%时防腐性能最好.H2O在不同PVC(pigment volume concentration)环氧涂层中传输的起始阶段满足Fick第二扩散定律.纳米SiO2虽可与环氧树脂发生物理化学键合,填充涂层孔隙,但超过临界添加量时纳米粒子团聚作用又使涂层缺陷增多,防腐性能降低.     

水管用环氧树脂涂料的研制

新研制的环氧树脂水管内表面涂层不含焦油成分,对水质卫生毫无影响,而且,耐蚀性能、机械性能均优于原来使用的焦油沥青环氧树脂涂料。用此新涂料完全可以取代焦油环氧树脂涂料。     

Evaluation of nanosilicate filled poly (vinyl chloride-co-vinyl acetate) and epoxy coatings

The corrosion protection, mechanical and thermal properties of nanoclay filled epoxy and poly (vinyl chloride-co-vinyl acetate) (VYHH) resins have been studied. Nanoclay was incorporated into VYHH at 0%, 0.5% and 1.5%wt loadings, and into epoxy at 0% and 1.5% loadings. Steel substrates were prepared and coated with each of the prepared coatings. Some of the samples were submerged in a tank containing 5% NaCl solution and tested periodically using electrochemical impedance spectroscopy (EIS) to study the effect of the nanoclay on the corrosion protection of the coatings. Films were cast from each system to be used to evaluate the mechanical performance of the coatings. Notched and unnotched samples were cut from the films and some were submerged in the 5%NaCl solution while some were left unsubmerged as controlled samples. EIS measurements showed that VYHH/0.5%nanoclay provided superior barrier protection. The nanoclay filled epoxy exhibited increased barrier properties after 21 days. The tearing energy of the neat VYHH coating decrease by 27% after submersion, while the nano coatings showed a slight increase. The neat epoxy showed no change in the tearing energy after submersion, while that of the nano coating was increased by 14% after submersion. Differential scanning calorimetry (DSC) results showed that the nano coatings have improved the thermal barrier properties compared to the neat.     

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.     

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.     

Corrosion performance of epoxy coatings modified by nanoparticulate SiO2

Electrochemical impedance spectroscopy (EIS) was employed to investigate the corrosion performance of nanoparticulate SiO₂ modified epoxy coatings on carbon steel in 3.5 wt% NaCl solution, coupled with salt spray test. Capacitance‐gravimetric methods and delamination tests were performed to analyze the water uptake behavior and interface stability against delamination of modified coatings, respectively. Four systems were studied, including a clear coating and three pigmented coatings (with 1, 2, and 3 wt% nanoparticulate SiO₂). The experimental results showed that nanoparticulate SiO₂ particles can improve the anti‐corrosion performance of the coatings and the optimal addition content is 2 wt%. The results obtained with capacitance‐gravimetric measurements showed that the diffusion process of water through epoxy coatings with different pigment volume concentration (PVC) obeyed the second Fick's diffusion law in the initial period. Adding nanoparticulate SiO₂ into epoxy coatings can act effectively. The positive influence is attributed to the reaction between nanoparticles and epoxy resin which is confirmed by FTIR, improving the barrier and dispersion effectiveness of coatings. The negative one is increasing the number of pores in the coatings when the adding amount is beyond the critical PVC.     

复合多防涂装在海水中的防护性能

介绍了油漆涂层，金属喷涂层，金属喷涂层／油漆封闭等13种复合多防涂装在静海和动海海水试验中的耐海水腐蚀性能，并对其耐腐蚀性能作了简要分析，进而选出最佳的涂装体系，实践结果表明，704＋842＋546环氧沥青，702＋846＋546环氧沥青，热喷A1涂层和喷A1＋842＋546环氧沥青4种涂装具有优良的耐静海海水腐蚀性能，环氧石英砂浆和热喷铝＋843＋546环氧沥青2种涂装具有优良的耐动海海水腐蚀性能。     

地面装备用防腐涂层体系现状及发展趋势

针对地面装备的防腐涂层现状,综述了地面装备用富锌底漆/环氧云铁中间漆/高耐候面漆、环氧防腐涂料/丙烯酸聚氨酯面漆、含氯树脂防腐涂层和有机-无机聚合物涂层4种防腐涂层体系的现状及发展趋势,指出地面武器装备的防腐涂层向长效、环保的方向发展,对防腐涂层的选用具有重要的参考价值.     

Determination of the protective properties of electrodeposited organic epoxy coatings on aluminium and modified aluminium surfaces

The electrochemical and transport properties and thermal stability of epoxy coatings electrodeposited on aluminium and modified aluminium surfaces (anodized, phosphatized and chromatized-phosphatized aluminium) have been investigated during exposure to 3% NaCl solution. From the results obtained from electrochemical impedance spectroscopy (EIS), gravimetric liquid sorption experiment and thermogravimetric analysis (TGA) it can be concluded that electrochemical and transport properties of epoxy coatings on anodized and chromatized-phosphatized aluminium are significantly improved with respect to the same epoxy coatings on aluminium and phosphatized aluminium: higher values of pore resistance and charge-transfer resistance and lower values of coating capacitance and double-layer capacitance, from EIS; smaller values of diffusion coefficient of water through epoxy coating, from sorption measurements and smaller amount of absorbed water inside the coating, from TGA. On the other hand, the somewhat lower thermal stability of these coatings was obtained.     

Assessment of graphene oxide/epoxy nanocomposite as corrosion resistance coating on carbon steel

Graphene and its derivatives are new materials with unique properties. In recent years, various studies about the nanocomposites based on graphene oxide (GO) have been carried out. However, the electrochemical properties of nanocomposite coatings based on GO materials have not been widely studied. In this study, GO/epoxy nanocomposite coatings were prepared by incorporation of different amounts of GO nanosheets into the epoxy matrix via mechanical agitation and sonication process. The dispersion of GO nanosheets in matrix was analysed by optical microscopy, transmission electron microscopy and Fourier transform infrared. The anticorrosive properties of these nanocomposite coatings were investigated by electrochemical impedance spectroscopy tests. Results showed that the corrosion protection of coatings was improved by addition of GO into the coatings material. Furthermore, the best corrosion resistance was achieved in 0·25 wt-%GO/epoxy nanocomposite coatings.     

海上平台保护涂层及性能

通过分析海上平台保护涂层标准和相关技术文件,对海上平台的涂层系统、所涉及涂料产品、涂层系统认可试验进行详细阐述,以便于平台涂装方案的设计和涂料产品的开发和认证。采用抽丝剥茧逐步推进的方法,对标准、涂层体系、涂料产品和性能要求进行逐一分析解读,得出了不同腐蚀环境的涂层系统和涂层结构。依据底、中、面涂层结构,把平台常用的防腐涂料进行了归类,并给出了不同腐蚀环境涂层系统的性能要求和评测方法。海上平台涂层体系的设计,可以依据NORSOK M501和NACE SP 0108,二者可以相互补益。海上平台涂层体系的认可按NORSOK M501进行,采用ISO20340的涂层合格性试验,包括循环老化试验、海水浸泡试验和抗阴极剥离试验。建立海上平台防腐涂料体系,需要开发的品种有富锌涂料、环氧防锈漆、环氧云铁、环氧玻璃鳞片漆、低表面处理环氧涂料、厚浆性环氧漆、环氧砂浆、无溶剂环氧漆、酚醛环氧漆、聚氨酯面漆、工程硅氧烷等。     

Studies on coatings containing nano-zinc oxide for steel protection

Zinc oxide (ZnO) nanoparticles (NPs) were synthesized using the coprecipitation method. The resulting NPs were characterized by X-ray diffraction, transmission electron microscopy, and Fourier transform infrared spectroscopy. The surface morphology of the coatings has been characterized by scanning electron microscopy (SEM). SEM images show a uniform and homogeneous distribution of ZnO-NPs in polyurethane (PU) coatings while aggregates appear in epoxy coatings. Using tensile stress–strain test, the effect of the addition of ZnO-NPs on the mechanical properties of PU and epoxy coatings was examined. The addition of ZnO-NPs has enhanced the Young's modulus and the tensile strength of PU and epoxy coatings. Through the open-circuit potential and electrochemical impedance spectroscopy measurements, the anticorrosive properties of PU- or epoxy-coated mild steel panels containing ZnO-NPs have been investigated in 0.5 M NaCl solution. Nyquist impedance plots for PU and epoxy coatings in PU- or epoxy-coated mild steel panels containing ZnO-NPs were tested in the absence and presence of ZnO-NPs have different responses. It has been shown that the dispersion of ZnO-NPs significantly improves the anticorrosive performance of PU coatings. A PU coating containing 700 mg/kg ZnO-NPs is recommended to achieve better mechanical properties and corrosion resistance.     

Corrosion protection of epoxy coatings containing ZSM‐5 zeolites on Mg–Li alloys

The epoxy composite coatings are developing towards nontoxic and environmentally friendly in the field of corrosion protection. In this study, ZSM‐5 zeolites were chosen as fillers and added to the epoxy coatings on the Mg–Li alloy surface. The effect of ZSM‐5 zeolites on the corrosion properties of epoxy coating was investigated. The results show that the epoxy coating doped with ZSM‐5 zeolites can improve the corrosion protection of the substrate. In particular, the epoxy coating loaded with 0.5% ZSM‐5 zeolites provides enough protection of the alloy against corrosion.     

火焰喷塑涂层的防腐性能研究

作者利用FSP—2型火焰喷塑枪在A3钢基体上喷涂了高压低密的聚乙烯粉末涂层和环氧树脂粉末涂层，对涂层表面的通针孔进行了检测，并对这两种涂层进行了1032h的中性盐雾试验研究。这些试验的结果表明：火焰喷涂的聚乙烯和环氧树脂粉末涂层致密性较高，对基体有很好的保护作用，并且其防腐效果随着预处理工艺和喷涂厚度的不同而有较大的不同。