Synthesis,characterization, corrosion inhibition of mild steel in HCl (0.5 N) solution and solid‐state electrical conductivity of new Co(II), Ni(II), Cu(II) and Zn(II) complexes

This work consists of a study of the corrosion‐inhibiting and semiconducting properties of new binuclear Co(II), Ni(II), Cu(II) and Zn(II) complexes with a Schiff base, H₂L, obtained from the 2:1 M condensation of salicylaldehyde and o‐dianisidine, respectively. Elemental, spectral and thermal analyses were used to characterize these complexes. The magnetic susceptibilities of these complexes were also determined. Weight loss, potentiodynamic polarization and scanning optical microscopy were the techniques used to investigate the efficiency of these new compounds as corrosion inhibitors. The antibacterial activity of the compounds was measured against sulfate‐reducing bacteria. It was found that inhibition occurs via the chemisorption of metal complexes on the steel surface. This absorption obeys the Langmuir adsorption isotherm model.     

氮化硼纳米片在重防腐涂层中的应用进展

氮化硼纳米片也被称为“白色石墨烯”,是一种重要的纳米填料,具有优异的机械性、导热性、耐磨性、阻隔性、疏水性,同时也是一种新兴的性能优良的绝缘材料.被广泛应用于重防腐涂层、润滑剂、传感器等领域.基于氮化硼纳米片在金属腐蚀防护领域巨大的应用前景,本综述将从氮化硼纳米片的制备及表面官能化、氮化硼薄膜防护涂层、氮化硼纳米片/有机防护涂层、氮化硼纳米片-无机复合材料/有机防护涂层这四部分进行系统总结,重点围绕氮化硼纳米片在有机涂层中均匀分散能力以及金属腐蚀防护能力等方面等进行详细分析和介绍,同时对氮化硼纳米片基防腐涂料未来发展进行了展望.     

对甲苯磺酸掺杂聚吡咯的合成、表征及其对金属镁的防腐蚀性能研究

以对甲苯磺酸为掺杂剂, 三氯化铁为氧化剂, 化学氧化吡咯制备了对甲苯磺酸掺杂聚吡咯. 考察了掺杂剂与氧化剂的用量对掺杂聚吡咯电导率的影响, 得到了高电导率聚吡咯的优化条件, 用UV, IR和SEM对其结构和形貌进行了表征. 结果表明, n(对甲苯磺酸)∶n(吡咯)∶n(三氯化铁)＝0.75∶1∶0.5时, 合成的聚吡咯的形貌规则, 电导率达42.7 S•cm^－1. 以聚吡咯为功能成分, 环氧树脂为成膜物质, 得到一种功能膜, 旋涂于金属镁表面, 采用极化曲线和开路电位考察了含有聚吡咯的膜层对金属镁的防腐蚀性能. 结果表明, 含有聚吡咯的膜层对金属镁有很好的防腐蚀性能, 腐蚀电流为0.0981 A, 腐蚀电位为－0.88 V, 在膜层与金属镁之间形成了一层钝化膜.     

Synergistic effect of functional carbon nanotubes and graphene oxide on the anti‐corrosion performance of epoxy coating

In this work, we reported the synergistic effect of functional carbon nanotubes (CNTs) and graphene oxide (GO) on the anticorrosion performance of epoxy coating. For this purpose, the GO and CNTs were firstly modified by the 3‐aminophenoxyphthalonitrile to realize the nitrile functionalized graphene oxides (GO‐CN) and carbon nanotubes (CNTs‐CN). As modified GO‐CN and CNTs‐CN were characterized and confirmed by Fourier transform infrared spectroscopy, X‐ray photoelectron spectroscopy, and gravimetric analyzer. It was found that about 19 and 24 wt% of 3‐aminophenoxyphthalonitrile were grafted onto the surface of the GO and CNTs, respectively. The electrochemical impedance spectroscopy results showed that the GO‐CN&CNTs‐CN hybrid materials exhibit a remarkable superiority in enhancing the anticorrosion performance of epoxy coatings. Significant synergistic effect of the lamellar structural GO‐CN and CNTs‐CN on the anticorrosion performance of epoxy composite coatings was designed. Besides, the epoxy coating with 1 wt% of the GO‐CN&CNTs‐CN hybrid exhibited the best anticorrosion performance, in which the impedance showed the largest one (immersion in 3.5 wt% of NaCl solution for 168 hr). Copyright © 2016 John Wiley & Sons, Ltd.     

Comparative analysis of shape memory-based self-healing coatings

Self-healing materials exhibit the ability to repair and to recover their functionality upon damage. Here, we report on an investigation into preparation and characterization of shape memory assisted self-healing coatings. We built on past work in which poly(ε-caprolactone) electrospun fibers were infiltrated with a shape memory epoxy matrix and delve into fabricating and characterizing a coating with the same materials, but employing a blending approach, polymerization induced phase separation. After applying controlled damage, the ability of both coatings to self-heal upon heating was investigated. In both methods, coatings showed excellent thermally induced crack closure and protection against corrosion, with the blend approach being more suitable for large-scale applications given its process simplicity. Two different approaches to the preparation of shape memory-based self-healing coatings were compared for their ability to heal structurally and functionally by heating. These two approaches, electrospinning versus polymerization-induced phase separation were found to feature comparable and quite complete healing, with the latter system offering the advantage of facile processing. © 2016 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2016 , 54, 1415–1426     

Stable Zinc Metal Anodes with Textured Crystal Faces and Functional Zinc Compound Coatings

The uneven electrodeposition and inferior corrosion resistance are the fundamental obstacles to achieve stable Zn metal anodes. The features of the electrode surface/interface are closely correlated with the properties. Herein, the Zn surface with more exposed (002)_Zn planes is modified through a simple acid-etching approach. The in situ generated zinc compounds form an interface layer with strong adhesion to the Zn electrode, which can enhance the Zn²⁺ ion kinetics and regulate the deposition/dissolution behaviors. A variety of acids with functional cations are selected, among which the phosphoric acid etches the Zn with a higher extent of texturing and generates a more compact layer. The obtained zinc phosphate@Zn electrode enables stable cycling and fast kinetics in symmetrical and full Zn metal batteries. This study provides a new example of combined surface and interface modification toward high-performance aqueous zinc metal anodes.     

Corrosion Inhibition Using Harmal Leaf Extract as an Eco-Friendly Corrosion Inhibitor

Extract of natural plants is one of the most important metallic corrosion inhibitors. They are readily available, nontoxic, environmentally friendly, biodegradable, highly efficient, and renewable. The present project focuses on the corrosion inhibition effects of Peganum Harmala leaf extract. The equivalent circuit with two time constants with film and charge transfer components gave the best fitting of impedance data. Extraction of active species by sonication proved to be an effective new method to extract the inhibitors. High percent inhibition efficacy IE% of 98% for 283.4 ppm solutions was attained using impedance spectroscopy EIS measurements. The values of charge transfer R_ct increases while the double layer capacitance C_dl values decrease with increasing Harmal extract concentration. This indicates the formation of protective film. The polarization curves show that the Harmal extract acts as a cathodic-type inhibitor. It is found that the adsorption of Harmal molecules onto the steel surface followed Langmuir isotherm. Fourier-transform infrared spectroscopy FTIR was used to determine the electron-rich functional groups in Harmal extract, which contribute to corrosion inhibition effect. Scanning electron microscopy SEM measurement of a steel surface clearly proves the anticorrosion effect of Harmal leaves.     

Ph-ATP@PANI复合材料的制备及防腐性能研究

以苯基-三乙氧基硅烷改性纳米凹凸棒石(Ph-ATP)为载体, 通过原位聚合制备了Ph- ATP@PANI纳米复合材料, 通过红外光谱(FTIR)、热重分析(TGA)、扫描电镜(SEM)和透射电镜(TEM)等表征了复合材料的微观结构和形貌. 以Ph-ATP@PANI纳米复合材料为填料制备了Ph-ATP@PANI/环氧树脂防腐涂层, 用电化学阻抗谱(EIS)、极化曲线(Tafel)以及盐雾试验分析了涂层的防腐性能. 测试结果表明, 相比纯PANI, Ph-ATP@PANI复合材料中PANI的红外特征吸收峰蓝移、热分解温度降低, Ph-ATP@PANI粒子在环氧树脂涂层中的分散性增强, 涂层的防腐蚀性能显著提升.     

纳米炭黑复合涂料的制备及其耐蚀性能

纳米炭黑复合涂料的制备及其耐蚀性能;纳米炭黑;复合涂料;制备;耐蚀性     

石墨烯/聚苯胺纳米复合材料的制备及防腐应用研究进展

导电聚苯胺(PANI)具有易合成、易掺杂等特点,石墨烯(GR)及石墨烯衍生材料具有较高的比表面积、良好的导电性、优异的防液体渗漏等物理和化学性质。两者的复合材料表现出优异的机械、电化学、防腐蚀等性能,引起了广泛的关注。介绍了石墨烯/聚苯胺纳米复合材料的制备方法、影响石墨烯/聚苯胺性能的主要因素以及石墨烯/聚苯胺纳米复合材料在防腐中的应用。系统总结了石墨烯/聚苯胺的防腐机理以及在不同基体涂料中的防腐改性,石墨烯的存在增加了腐蚀介质(如H2O和O2)渗透路径的曲折程度,减缓了金属腐蚀速度,从而提高涂料防腐效率。石墨烯/聚苯胺复合材料在防腐方面具有广阔的应用前景,对石墨烯/聚苯胺的复合状态、防腐机理、环境适应性的深入研究是未来该材料的发展方向。