Electrochemical examining behavior of epoxy coating incorporating zinc-free phosphate-based anticorrosion pigment

Protective performance of the epoxy primer containing strontium aluminum polyphosphate (SAPP) as a zinc-free phosphate-based anticorrosion pigment is aimed to assess in this work through taking advantage of electrochemical impedance spectroscopy (EIS) and electrochemical noise method (ENM). The absence of zinc offers an excellent environmentally friendly profile to the class of inhibiting compound. In the pigment extracts, the electrochemical techniques revealed superiority of SAPP compared to the conventional zinc phosphate (ZP). The behavior was connected to precipitation of a protective layer on the surface exposed to SAPP. In comparison with ZP, the most effective SAPP content in the protective primer was then determined using EIS.     

对大型钢结构建造物用长效防蚀耐候涂层设计方案及其测试方法的几点浅见

本文主要通过防蚀耐候涂层的设计方案及与之相配套的底漆，面漆的选择，映出几种优异的防蚀耐候性能产品的介绍，列举了国内外的具体实例，理论结合实际，同时还提出了对防蚀耐候性检测方法的探索，对防腐涂料进行了概括性的描述。     

Effect of after-cooking darkening inhibitors on stability of frying oil and quality of french fries

The effect of two after-cooking darkening inhibitors, sodium acid pyrophosphate (SAPP) and calcium acetate (CaAc), and their combined effect on frying oil stability and quality of french fries produced were evaluated over a period of 72 h. Samples of frying oil and par-fried french fries were taken at 3-h intervals through each experiment and analyzed for selected chemical and physical parameters. As the frying time increased, all the oil samples contained increased amounts of deterioration products. The color index and free fatty acid (FFA) values were highly correlated with frying time. There were no significant effects on oil properties in terms of FFA until 9 h of frying among the 4 pretreatments. However, from 12 to 72 h of frying, oil used to fry potatoes treated with SAPP contained less FFA than oils exposed to CaAc alone or in combination with SAPP. The fat content of par-fried french fries was approximately 0.11 g/g dry matter and remained relatively constant during extended frying. After-cooking darkening of par-fried french fries and final color of the fries were affected by the pretreatment, but not by the frying time.     

Synergistic enhancement of polyvinylpyrrolidone-modified TiO2 and graphene oxide on the corrosion resistance of waterborne epoxy

Waterborne epoxy (WEP) resins have garnered significant interest due to their potential application as anticorrosion coatings for steel materials. However, it has been reported that defects in the cured coatings generated during the curing process lead to the level of anticorrosion not meeting the expected effects. In this study, TiO₂ and GO were selected to be modified by polyvinylpyrrolidone (PVP) to obtain PT and PG, and used to improve the anticorrosion performance of WEP. The obtained PT and PG were characterized using Fourier transform infrared, Raman, and x-ray photoelectron spectroscopy. The morphology of PT and PG before and after modification was observed using scanning electron microscopy, and the differences were described. The analysis results of laser confocal scanning microscopy and water contact angle (WCA) indicate that there are differences in surface roughness and WCA of the WEP coatings with or without PT and PG. Electrochemical impedance spectroscopy was used to evaluate the anticorrosion performance of the coatings. The results showed that WEP coatings containing PT and PG exhibited better anticorrosion performance. The synergistic enhancement of PT and PG on the anticorrosion performance was proposed, which can be attributed to the comprehensive effect of the hydrophobicity of the coating surface and the barrier effect of PT and PG within the coatings.     

二维层状材料在涂层防腐中的研究进展

二维层状材料由于其独特的形貌结构、较高的比表面积、优异的物理机械性能等优势在涂层防腐中受到了广泛的关注。结合国内外最新研究，综述了近年来石墨烯、六方氮化硼、二硫化钼、水滑石及蒙脱土等二维层状材料在涂层防腐中的研究进展，并对各类二维层状材料应用于涂层防腐中的防腐效果进行了对比与总结，最后对二维层状材料在涂层防腐中的发展趋势进行了展望。     

Investigation on anticorrosion performance of nano and micro polyaniline in new water-based epoxy coating

In this research, a micro polyaniline (MicroPAni) and a dispersion of nano polyaniline particles (NanoPAni) were used as anticorrosion additive in a new water-based epoxy coating. Both materials were added directly to a new water-based hardener (RIPI-W.B.H.). The resulted mixtures were homogenized and sonicated for size reduction and better particle dispersion. The average particle size of polyaniline in the hardener was determined using dynamic light scattering (DLS). Transmission electron microscopy (TEM) was used to observe the particle size of polyaniline in the final dried film. After applying the coatings on metal surface, anticorrosion performance and adhesion properties of the coatings were compared together with a reference coating using salt spray and cross-cut adhesion tests. The results showed that anticorrosion performance of coating containing NanoPAni was better than the one for coating containing MicroPAni. In addition, investigation on the morphology of metal-coating interface by scanning electron microscopy (SEM) technique in samples containing polyaniline after salt spray test showed stable oxide layer formation on metal surface, which will enhance the corrosion resistance.     

改性石墨烯基填料在防腐涂料中的应用研究进展

石墨烯具有高导电性、高强度和对水分子、氧、氯离子等良好的阻隔性能。石墨烯基填料与防腐涂料相结合,在电网设施、船舶重防腐、海洋工程、石油化工等工业防腐领域有强大的应用潜力。本文针对石墨烯作为防腐填料所存在的优点和问题进行分析,综述了近年来石墨烯基填料在工业防腐涂料领域的研究现状,并对今后改性石墨烯基填料与水性涂料相结合的研究方向进行了展望。     

输气站场管道的外腐蚀检测技术

为了确保输气站场管道安全稳定运行,防止站场管道发生腐蚀穿孔,需要对站场管道进行外腐蚀检测,知道站场管道状态做出安全评估。采用PCM检测方法检测管道防腐涂层损坏程度就可间接得到管道的腐蚀情况,从而实现埋地管线的不开挖检测。提出一些检测时需改进的意见。检测之前,要了解清楚站场管道的走向和埋深状况,以及各处配件状况,从而确定检测的管段和信号接入点位置;检测过程中,应尽量关闭埋地电源线的电源;检测完毕之后要对管道防腐涂层破损处进行定位,对于电磁信号波动比较大的地方,应多次测量,排除干扰因素,还可以开挖检测。所以,通过PCM检测防腐涂层来判断站场管道的外腐蚀情况是经济可行的方法。     

对石灰石-石膏法脱硫装置吸收塔衬里橡胶的应用研究

石灰石-石膏法脱硫装置中吸收塔的腐蚀在整个装置中是最严重的,而吸收塔是整个装置中最重要的设备,直接决定脱硫效率的高低,从而对吸收塔的防腐衬里材料的选择、设计和施工尤为重要。丁基橡胶作为吸收塔的衬里材料在国外得到了广泛应用,对吸收塔的腐蚀机理、衬里橡胶的性能及应用中的问题进行了探讨,指出我国应在脱硫装置中推广应用橡胶作为防腐材料。     

钢制石油储罐边缘板的防腐密封

分析钢制石油储罐边缘板较易腐蚀的原因,介绍一种有效的边缘板防腐密封技术,即采用一种新型防腐材料DENSO和防腐施工方案,延长罐底边缘板的使用寿命。     

Comparison of the efficiency of inorganic nonmetal pigments with zinc powder in anticorrosion paints

This paper deals with the study of properties of anticorrosion pigments of varying chemical composition in epoxyester paints. Two type lines of paints were prepared. The first line comprised an anticorrosion pigment with a PVC concentration of 10% while the other line comprised an anticorrosion pigment with a PVC concentration = CPVC. The following nontoxic anticorrosion pigments were observed: zinc phosphate, zinc phosphomolybdate, calcium hydrogen phosphate, zinc phosphate modified with an organic corrosion inhibitor, strontium–aluminum polyphosphosilicate, zinc–aluminum polyphosphate, calcium metaborate, calcium ferrite, calcium borosolicate, and strontium chromate. The epoxyester primers were observed for the effect of the type of pigment on the anticorrosion properties. Anticorrosion efficiency was derived from tests in a condenser chamber and in a salt spray cabinet as well as from a test of chemical resistance of pigmented coatings. The evaluation of anticorrosion efficiency of inorganic nonmetal pigments was carried out by means of comparison with anticorrosion efficiency of metal dust.     

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.     

水性自干防腐涂料的制备

以环氧树脂与丙烯酸单体接枝共聚得到的水性自干环氧丙烯酸树脂为防腐涂料基料、钛铁粉为防腐颜料制得水性高效防腐涂料。研究了树脂中环氧树脂的用量、涂料中防腐颜料的种类和用量对涂料防腐性能的影响。结果表明,树脂中环氧树脂E-44的用量为30%、钛铁粉的用量为5%时,防腐涂料具有优异的防腐性能和力学性能。     

Electrochemical study of TEOS,TEOS/MPTS,MPTS/MMA and TEOS/MPTS/MMA films on tin coated steel in 3.5% NaCl solution

This work compares the anticorrosion features of siloxane layers as eco-friendly alternatives for chromium passivation process on industrials tin coated steel and unravels the influence of each component of the film. The films were prepared with synergistic blends of siloxanes as tetraethyl orthosilane (TEOS), 3-methacryloxy-propyl-trimethoxysilane (MPTS) and methyl methacrylate (MMA). To assess the influence of each component, five different films were prepared: TEOS-based, MPTS-based, TEOS/MPTS, MPTS/MMA and TEOS/MPTS/MMA. The corrosion resistance of the coatings was evaluated by means of open circuit potential, anodic polarization curves and electrochemical impedance spectroscopy measurements, and the anticorrosion properties discussed based on electrical equivalent circuit fitting. Coated surfaces were analyzed using atomic force microscopy and the coatings’ thicknesses were evaluated by means of glow discharge optical emission spectroscopy. The results plainly showed the efficiency of the anticorrosion properties of the film in a 3.5 wt.% NaCl solution and have clearly revealed the improvement of the protective properties of the coating when the MPTS was added to the formulations, pointing this component as the main responsible for the coating anticorrosion action. The addition of MMA to the formulation led to formation of coatings with low long term anticorrosion protection, which was ascribed to the low thickness.     

Stability of viscose in zinc-free precipitation baths of various compositions

Conclusions The effect of the composition of a zinc-free precipitation bath and of the nature and concentration of the mono- or polyvalent cations contained in it on the behavior of the spinning solution in the precipitation bath has been examined.The possibility of using zinc-free precipitation baths containing the polyvalent ions aluminum or magnesium for spinning viscose fibres has been demonstrated.Translated from Khimicheskie Volokna, No. 1, pp. 30–31, January–February, 1990.     

Alternating Multilayer Structural Epoxy Composite Coating for Corrosion Protection of Steel

Epoxy composite coatings filled with fillers have been used extensively as anticorrosion materials. In this study, an alternating multilayer structure is designed to obtain multifunctional epoxy resin composite coating based on stepwise coating method via adding graphene and α‐alumina. Their mechanical properties, thermal conductivity, dielectric and anticorrosion properties are characterized. The toughness and the thermal conductivity clearly increase, while the dielectric properties decrease approximately to zero when the filler mass fraction increases from 0.00% to 0.15%. The whole corrosion process is controlled by electrochemical reaction, and the fillers effectively block the corrosive medium, thus improving the anticorrosion performance of the composite coating.     

防腐剂吸附效应与润滑油防腐性能的关系

引言润滑油中添加剂的性质决定了润滑油的性能,防腐剂的存在对润滑油的防腐性能起到了决定性作用,为开发适合于海洋环境条件下防腐型轴承润滑油,防腐剂对润滑油防腐性能的影响规律和影响机理等问题均亟需解决。添加剂在摩擦副界面的吸附是液-固吸附,目前对于两相吸附的研究主要针对于气-液[1]、气-固间的吸附[2-3]和离子流体中的液-固吸附研究[4-6],防腐剂的缓蚀机理研究主要针对     

Investigation of the mechanical,thermal, and anticorrosion properties of epoxy nanocomposite coatings: Effect of synthetic hardener and nanoporous graphene

In the present study, epoxy samples containing nanoporous graphene (NPG) were synthesized and analyzed in terms of mechanical, morphological, thermal, adhesion, and anticorrosion properties. To this end, the employed curing agents (hardeners) were synthesized and NPG content was varied from 0 to 1 wt %. By using a hardener with aliphatic side chains, the toughness of the nanocomposite was improved without a decrease in the modulus. Adding 1 wt % NPG increased the modulus of the nanocomposite by about 30%. The dynamic mechanical results showed an increment in the glass transition of the samples containing 1 wt % NPG. Field emission scanning electron microscopy images were used to observe the fracture surface of the nanocomposites. The thermogravimetric analysis analysis also confirmed that using synthetic hardener and NPG as the nanofiller enhanced the thermal resistance of the samples. The images of the protected metal panel surfaces and their coatings were used to study adhesion and anticorrosion properties. These results indicated that the hardener synthesized in this work along with NPG improved the mechanical, thermal, adhesion, and anticorrosion properties of the epoxy nanocomposites effectively. The specific characteristic of the synthetic hardener was its chemical structure including both aliphatic and cyclic polyamines as the side groups. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135, 46201.     

水性防腐涂料的研究进展

重点介绍了水性环氧、水性丙烯酸和水性无机富锌涂料3种防腐体系,分别阐述了这3种防腐体系的组成、防腐机理、各自的优缺点,并对水性防腐涂料的发展前景进行了展望。     

加工高含酸原油装置的长周期运行方法与措施

目前不少石油化工企业所炼原油属高酸值低硫原油,密度和粘度大,各项腐蚀因素随原油开采深度和难度的增加呈上升趋势。恶劣的原油性质大大加剧设备腐蚀,严重影响装置长周期平稳运行。加强设备防腐蚀,应在投入力度、不同腐蚀类型的防护措施、新耐蚀技术应用等方面加强。分析了某石化企业的高酸值低硫原油炼制,提出采用"高温部位加强材质升级,低温部位加强工艺防腐,辅以防腐新技术应用"的防腐技术思路,探讨有效控制设备腐蚀破坏,同时降低防腐成本、提升经济效益和社会效益的方法与措施。