镁合金缓蚀剂的研究进展

缓蚀剂技术是防腐蚀技术中应用最为广泛的一种技术。基于镁合金这种超轻材料的特殊地位,对近几年所研究的镁合金缓蚀剂按其化学组成进行了分类,并对其作用机制进行了总结。最后,对镁合金缓蚀剂未来的研究方向及发展趋势提出了展望。     

聚苯胺双层膜防止钢片腐蚀问题探索

研究了聚苯胺防腐蚀的机制和效能等问题,并提出研究新的环保防腐蚀材料是目前重要的工作,可改善重金属对人类与环境的危害。     

国内期刊荟萃

煤基聚苯胺防腐蚀性能的研究邓宇强等.腐蚀与防护,2004,25(8):323聚苯胺对铁基金属具有优异的防腐蚀效果,开发聚苯胺防腐蚀涂料已成为防腐蚀涂料研究领域的一个新的研究热点。煤基聚苯胺利用煤的孔隙结构,分子筛结构和芳香层片结构,使苯胺溶胀在其中,然后引发原位聚合,从而制得导电率与聚苯胺相当的煤基聚苯胺。该煤基聚苯胺与纯聚苯胺相比具有聚合工艺简单、成本低等优点。本文采用加速浸泡和电化学测试方法,研究了煤基聚苯胺用于防腐蚀涂料中对碳钢的保护性能和效果。结果表明:①煤基聚苯胺在涂层中能起阳极保护作用的前提是其添加量要充…     

掺聚苯胺纳米纤维的水性环氧树脂涂料的防腐性能研究

以掺聚苯胺纳米纤维的水性环氧树脂涂料为研究对象,从聚苯胺纳米纤维的导电性和电活性、掺聚苯胺纳米纤维的水性环氧树脂涂料防腐性能和Q235钢锈层的物相特征三个方面进行研究和分析。研究表明,聚苯胺纳米纤维具有强的水溶性、高达0.12 S/cm的电导率和可逆的氧化-还原活性等特性,因而适合作为水性防腐蚀涂料的缓蚀剂。由于聚苯胺的纳米结构和独特的可逆氧化还原性质,仅掺入0.6%的聚苯胺纳米纤维就能够很大程度地改善水性环氧树脂涂料防腐性能。     

显微红外技术研究聚苯胺涂层防腐蚀性能

聚苯胺是一种导电高分子,聚苯胺涂料因其性价比较高而被看作是新一代环境友好型的高效防腐涂料.本研究以过硫酸铵为引发剂,十二烷基苯磺酸钠为乳化剂,采用乳液聚合法制备丙烯酸树脂乳液.分别采用乳液互穿网络聚合法和乳液共混法制备聚苯胺--丙烯酸树脂防腐蚀涂料,并利用红外显微镜技术分析聚苯胺在聚苯胺--丙烯酸树脂防腐蚀涂料中的分散性.涂层在马口铁上腐蚀电位和极化曲线的测试结果表明,采用乳液互穿网络聚合法制备的聚苯胺--丙烯酸树脂防腐蚀涂层在ω(NaCl)为3.5%的NaCl溶液中的开路电位比乳液共混法升高了0.596V,自腐蚀电流降低了1个数量级.     

一种绿色环保型金属防腐蚀缓蚀剂——印仁和,万宗跃,徐群杰.CN 101117716

本发明涉及一种绿色环保型金属防腐蚀缓蚀剂。属防腐蚀化学制剂技术领域。本发明的一种金属防腐蚀缓蚀剂,是由肌醇六磷酸酯PA和聚丙烯酸钠PAAS组成：由上述两种物质配制成的混合溶液的总质量浓度为25-35mg／L,并且肌醇六磷酸酯PA和聚丙烯酸钠PAAS的浓度比为1．5：1～2．0：1。本发明的PA与PAAS的复配溶液缓蚀剂具有良好的对金属的防腐蚀缓蚀作用．具有用量低、缓蚀阻垢能力强的突出优点．并且对环境无污染。     

聚苯胺的制备及其在涂料中的应用

导电聚苯胺有优异的导电性能、化学稳定性和防腐蚀性能,具有巨大的潜在实用性价值介绍了导电聚苯胺的国内外研究现状、防腐蚀机理、制备方法及其在涂料中的应用。     

铝合金微乳化切削液中缓蚀剂的研究进展

微乳化液具有其他种类切削液的优点,是切削液未来发展的重点。使用缓蚀剂是切削液中防止工件腐蚀的一种有效手段,对它的研究具有重要的意义。本文介绍了切削液的分类,然后分析了铝合金在切削液中的腐蚀和防腐蚀问题,重点介绍了铝合金缓蚀剂分类,最后提出了未来缓蚀剂的发展方向。     

铁质文物防腐蚀保护材料及应用研究

在中国文物中铁质文物所占的比重非常大,而如何科学、有效的保护好这些铁质文物非常重要。为了选择出适合铁质文物防腐蚀防护的最佳保护材料及方法,文章通过几个实验主要测试了3种缓蚀剂和3种封护剂材料对铁质文物腐蚀防护的作用。实验的结果表明:缓蚀材料1和封护材料2一起使用时较其他材料能更好的起到防止铁器的腐蚀,故选择该方法作为铁质文物防腐蚀的防护方法非常可取。     

易分散纳米聚苯胺改性环氧铁红底漆的防腐性研究

通过引入表面活性剂,合成了易分散纳米聚苯胺(PANI-1)。运用傅里叶变换红外光谱仪(FTIR)和场发射扫描电镜(FE-SEM)表征了聚苯胺的结构,利用电化学方法研究了聚苯胺的防腐性,并采用聚苯胺对环氧铁红底漆进行改性。研究发现,经过表面活性剂改性的聚苯胺为松散纳米结构,容易分散于有机溶剂中;腐蚀测试结果表明,聚苯胺对碳钢有较好的防腐蚀能力,当PANI-1含量为3.5%时,纳米聚苯胺改性环氧铁红底漆涂层具有较好的防腐蚀能力,可应用于桥梁、道路护栏等钢结构的防腐工程。     

Investigation of corrosion protection performance of epoxy coatings modified by polyaniline/clay nanocomposites on steel surfaces

In this study, polyaniline (PANI) and polyaniline/clay nanocomposites were prepared via in situ oxidative polymerization. The morphology of nanocomposites structures was investigated by X-ray diffraction (XRD). The chemical structures of PANI and PANI/clay nanocomposites were examined via Fourier transform infrared (FT-IR) spectroscopy. Polyaniline-based pigments were introduced into epoxy paint and applied on steel substrates. The effect of clay addition and the type of clay cation, including Na⁺ in natural clay (MMT) and alkyl ammonium ions in organo-modified montmorillonite (OMMT), on the anticorrosion performance of epoxy-based coatings was investigated through electrochemical Tafel test, electrochemical impedance spectroscopy and immersion measurements in NaCl solution. The stability of the adhesion of the neat and modified epoxy coatings to the steel surface was also examined. The results indicated that introduction of PANI/OMMT nanocomposite into epoxy paint results in improved anticorrosion properties in comparison with PANI/MMT and neat PANI.     

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.     

Conductivity and anticorrosion performance of polyaniline/zinc composites: Investigation of zinc particle size and distribution effect

Polyaniline/zinc composites and nanocomposites were prepared using solution mixing method. Zinc (Zn) particles with an average particle size of 60 μm and zinc nanoparticles with an average particle size of 35 nm were used as fillers in polyaniline (PANI) matrix. Films and coatings of PANI/Zn composites and nanocomposites were prepared by the solution casting method. Electrical conductivity and anticorrosion properties of PANI/Zn composite and nanocomposite films and coatings with different zinc loadings were evaluated. According to the results, electrical conductivity and anticorrosion performances of both PANI/Zn composites and nanocomposites were increased by increasing the zinc loading. Also results showed that the PANI/Zn nanocomposite films and coatings have better electrical conductivity and corrosion protection effect on iron coupons compared to that of PANI/Zn composite.     

功能酸二次掺杂聚苯胺的防腐蚀性能

聚苯胺具有独特的掺杂脱掺杂特性,能在特定的反应条件下合成出形貌较好的纳米纤维,使得通过脱掺杂和二次掺杂能制备出拥有特殊防腐官能团的新型纳米材料。将硫酸体系中合成的聚苯胺纳米纤维经氨水脱掺杂,再用磷酸、对甲苯磺酸和酒石酸等功能酸在脱掺杂态聚苯胺基础上制备出二次掺杂态聚苯胺,测试了聚苯胺/环氧树脂复合涂层的防腐蚀性能,并与功能酸一次掺杂态聚苯胺进行了对比。结果表明,功能酸掺杂的聚苯胺都有一定的防腐蚀效果;功能酸二次掺杂态聚苯胺比一次掺杂态聚苯胺有更好的防腐蚀性能,二次掺杂态聚苯胺涂层拥有更高的阻抗,其中酒石酸二次掺杂态聚苯胺涂层的阻抗最高,浸泡120 d后为3.48×10⁷ Ω·cm²,较其一次掺杂态聚苯胺涂层高出一个数量级。     

New approach for simultaneous enhancement of anticorrosive and mechanical properties of coatings: Application of water repellent nano CaCO3–PANI emulsion nanocomposite in alkyd resin

New alkyd coatings were prepared by addition of water-based polyaniline–4% CaCO₃ (PAC) nanocomposites into alkyd resin. Pure polyaniline (PANI) and PAC were synthesized using ultrasound assisted emulsion polymerization and added to alkyd resin to form nanocomposite coating. Nano CaCO₃ was added in different percentage ranging from 0% to 8% of monomer during the synthesis of polyaniline. XRD and TEM reveals that water repellent nano CaCO₃ is thoroughly dispersed in PANI matrix. The effect of PANI and PAC nanocomposite on mechanical and anticorrosion performance of alkyd coating was evaluated. An electrochemical measurement (Tafel Plots) shows that corrosion current I_corr was decreased from 0.89 to 0.03 μA/cm², when PAC nanocomposite was added to neat coatings. Positive shift of E_corr. also indicates that PAC nanocomposite acts as an anticorrosive additive to alkyd coating. Presence of water repellant nano CaCO₃ in PAC nanocomposite has exhibited dual effect, such as improvement in mechanical and anticorrosion properties. The experimental results have shown superiority of PAC nanocomposite over PANI when PAC nanocomposite added to alkyd coatings.     

Preparation of PANI/epoxy/Zn nanocomposite using Zn nanoparticles and epoxy resin as additives and investigation of its corrosion protection behavior on iron

Conducting polyaniline, zinc and epoxy resin solely have anticorrosive properties by different mechanisms on metallic substrates. In this work the triple hybrid of PANI/epoxy/Zn nanocomposite was prepared as a thin layer coating (70 ± 5 μm) on iron coupons and its anticorrosion performance was investigated in HCl (0.1 M) as corrosive solution. Epoxy resin and zinc nanoparticles were applied as additives in the PANI matrix to improve the mechanical properties of PANI coating and investigate their synergetic effects on the anticorrosion performance of PANI coating. At first PANI/Zn nanocomposite coatings with different Zn contents were prepared and the zinc content optimized so that the coating achieve the best anticorrosion performance. Accordingly the iron coupons coated by PANI/Zn coating having 4 wt% Zn content showed more noble open circuit potential and lower corrosion current values. Then epoxy resin was applied as additive to the optimized formulation of PANI/Zn coating in different weight percents (0–20 wt%) and the anticorrosion performance of the related PANI/epoxy/Zn triple hybrid nanocomposite coatings was evaluated. Results showed that the addition of epoxy resin causes to the decreasing of corrosion current of iron samples coated by PANI/epoxy/Zn nanocomposite. An optimum range of 3–7 wt% was obtained for the epoxy content in the composition of PANI/epoxy/Zn nanocomposite in which the coating exhibits the best anticorrosion performance. Iron metal coupon was elementally analyzed and the PANI/Zn and PANI/epoxy/Zn nanocomposites were characterized using Fourier Transform Infrared spectroscopy, X-ray diffraction patterns and Scanning Electron Microscopy techniques.     

Facile fabrication of superhydrophobic polyaniline structures and their anticorrosive properties

We report a simple approach for the preparation of superhydrophobic polyaniline (PANI) and its application for the corrosion protection coatings. First, PANI was synthesized conventionally by oxidative polymerization with APS. Subsequently, PANI with different wettability was obtained by modification with different surfactants. The surface modification of PANI with three different surfactants (sodium dodecylbenzenesulfonate, polyethylene glycol, and cetyltrimethylammonium bromide) provided excellent surface superhydrophobicity (water contact angle >150°). The structure and morphology of as‐prepared PANI were characterized with Fourier transform infrared, Energy dispersive X‐ray spectroscopy, and Scanning electron microscopy. Corrosion protection performance of PANI with different wettability was evaluated in 3.5% NaCl electrolyte using Tafel polarization curves and electrochemical impedance spectroscopy. The results indicated that various superhydrophobic PANI coatings have better anticorrosion performance as compared to the hydrophilic PANI. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133, 44248.     

Corrosion of mild steel with composite polyaniline coatings using different formulations

The protective abilities of composite coatings based on electrochemically and chemically formed polyaniline powder against the corrosion of mild steel were investigated. A polyaniline powder has been prepared in the form of an emeraldine base and benzoate salt through chemical dedoping and doping. The composite coatings using polyaniline powders, which were obtained through different routes, and base coatings, which were not corrosion-resistant, with different formulations were prepared and applied on mild steel samples. The corrosion was investigated using an electrochemical impedance technique in 3% NaCl, and the atmospheric corrosion was assessed in a humidity chamber. Emeraldine–benzoate salts, which are a chemically synthesized polyaniline, offer the best protection with an optimal polyaniline concentration of approximately 5 wt%. The different corrosion behaviors were assessed relative to the presence of aniline oligomers in the samples after characterization using UV–vis spectrophotometry. Upon comparison between the corrosion behavior in 3% NaCl with commercial primer paint for iron and that with a paint containing 5 wt% PANI, the composite coating has superior anticorrosion characteristics. The mechanism for the protection of mild steel from corrosion through composite polyaniline coatings was also considered.     

Conducting polymers for corrosion protection: a review

Conducting polymers (CPs) such as polyaniline (PANI), polypyrrole (PPy), and polythiophene (PTh) are used for the corrosion protection of metals and metal alloys. Several groups have reported diverse views about the corrosion protection by CPs and hence various mechanisms have been suggested to explain anticorrosion properties of CPs. These include anodic protection, controlled inhibitor release as well as barrier protection mechanisms. Different approaches have been developed for the use of CPs in protective coatings (dopants, composites, blends). A judicious choice of synthesis parameters leads to an improvement in the anticorrosion properties of the coatings prepared by CPs for metals and their alloys. This article is prepared as a review of the application of CPs for corrosion protection of metal alloys.