epoxy coating for mild steel

2021/05/21

Meanwhile, the well-dispersed PPyNG could block the coating pores and decrease the corrosive medias diffusion toward the substrate. Figure 2 shows the FTIR spectra of the PPyN and PPyNG nanocomposites.

National Library of Medicine Similar phenomenon was observed in others research [38]. In brief, 100 g KMnO4 (1 wt % equiv.) The molecule structures and morphologies of the PPyNG nanocomposites were also analyzed. Evolution of open circuit potential (OCP) value for the samples with continuous immersion. Table 1 shows the electrochemical parameters that were obtained from Tafel curves. Schematic illustration of the preparation of waterborne epoxy/PPyNG coatings (EPPyNG) nanocomposite coatings. Conjugation length of PPy was increased with the addition of graphene. Careers. The potential dynamic polarization curves of blank epoxy, EPPyN, and EPPyNG coatings were performed with a sweep rate of 2 mV/s from the cathodic direction to the anodic direction.

The polypyrrole nanowires with about 50 nm in diameter were obtained. PPy is an excellent candidate for replacing hexavalent chromate, since it shows anticorrosion performance that is similar to that found for chromate [6,15]. Shchukin D.G., Zheludkevich M., Yasakau K., Lamaka S., Ferreira M.G.S., Mhwald H. Layer-by-Layer Assembled Nanocontainers for Self-Healing Corrosion Protection. According to the above results, Figure 9 demonstrates the mechanism of corrosion protection for the mild steel substrate with neat epoxy coating and PPyNG nanocomposite coatings. Jadhav N., Vetter C.A., Gelling V.J. The Cc of pure epoxy coating continuously increased from 3.1 109 F/cm2 to 1.1 108 F/cm2. We thank Jiangxi Key Laboratory of Surface Engineering for SEM characterization. For comparison, the neat epoxy coating was also prepared through a similar method without loadings, which was named Blank. Rpore modeled ionically conducting paths across the coating, which could be used to evaluate the barrier performance of the coatings [54].

Pretreated graphite was then dispersed in the alkali water (pH = 14) under ultrasonication while using a sonic vibra-cell VC505 processor in 60% power for 1 h, resulting in black graphene slurry. The studied nanocomposite coating possessed superior corrosion protection performance when the graphene content of the filler was 2 wt %. The graphene slurry was centrifuged at 10,000 rpm for 10 min. Furthermore, PPyN reacted with steel to form a dense layer of passive oxide film, which resulted in substantially reduced penetration of corrosive medias. ; data curation, Y.D.

; writingreview and editing, J.Z. Qiu S., Chen C., Cui M., Li W., Zhao H., Wang L. Corrosion protection performance of waterborne epoxy coatings containing self-doped polyaniline nanofiber. Many methods for corrosion protection have been developed, such as environmental modification, anodic protection, cathodic protection, protective coatings, and corrosion inhibitors, or any combination thereof [1,2,3]. Investigation, Y.D. 8600 Rockville Pike and J.Z. 1Jiangxi Engineering Laboratory of Waterborne Coating, Department of Coatings and Polymeric Materials, Jiangxi Science and Technology Normal University, Nanchang 330013, China; moc.361@8210ygnid (Y.D. You can join in the discussion by joining the community or logging in here.You can also find out more about Emerald Engage. The EPPyNG3 coating also exhibited lower Rpore and higher Cc than EPPyNG2, which confirmed that excess graphene induced the defect coating and reduced corrosion protection. ); moc.361@remylopcjr (J.R.); moc.361@fhzynnnus (H.Z. Zhang L.L., Zhao S., Tian X.N., Zhao X.S. Ghanbari A., Attar M.M. However, for the EPPyNG2 coating, the radius of capacitive impedance arc at low frequency region in the immersion seven days suddenly expanded beyond that of three days, which suggested that PPy might react to passivate the metal substrate [23]. The quantitative analysis of Tafel curve was also investigated, and Table 1 summarizes the result. The electrolyte was 3.5 wt % NaCl solution. The https:// ensures that you are connecting to the All of the chemicals were of analytical reagent grade and used without further purification.

The EPPyN (Figure 6c), EPPyNG1 (Figure 6g), and EPPyNG3 (Figure 6i) showed the same trend.

Evidence of redox interactions between polypyrrole and Fe3O4 in polypyrroleFe3O4 composite films. The prepared graphene was re-dispersed in N-methyl pyrrolidone (NMP) for further use. In the case of protection efficiency, the highest PE value from EPPyNG2 (99.9%) described that PPyNG2 loading in the epoxy coating can provide superior inhibition corrosion performance.

Hosseini M.G., Sabouri M., Shahrabi T. Comparison of the corrosion protection of mild steel by polypyrrolephosphate and polypyrroletungstenate coatings. ; supervision, Z.C. Designing a dual-functional epoxy composite system with self-healing/barrier anti-corrosion performance using graphene oxide nano-scale platforms decorated with zinc doped-conductive polypyrrole nanoparticles with great environmental stability and non-toxicity. Therefore, PPy nanowires/graphene nanocomposite would be used as a promising anticorrosion pigment. Figure 5 shows the Tafel curves of the as prepared coatings immersion in corrosive solutions. Among the available ICPs, polypyrrole (PPy) is the most promising polymer due to its easy polymerization, mechanical stability, and better biocompatibility, as well as tunable electrical property [13]. 51563011 and 2170436). Parameters of Tafel polarization curve for coated Q235 substrates. Results of electrochemical impedance spectroscopy (EIS) for coated Q235 substrates. All of the electrochemical tests were conducted at room temperature. The bands at 1048 and 1321 cm1 were attributed to CH deformation vibrations and CN stretching vibrations, respectively [32]. Figure S3: Tafel curve of the bare mild steel electrode. In addition, the peaks that were centered at 1202 and 923 cm1 were assigned to the doping states of PPy [33]. Study on Enhancement Mechanism of Conductivity Induced by Graphene Oxide for Polypyrrole Nanocomposites. 3lpe The PPyN/graphene (PPyNG) nanocomposites were synthesized through in situ polymerization. Berdichevsky Y., Lo Y.H. EIS is a powerful tool for investigating the corrosion protection of the coatings [47]. Although EPPyNG3 possessed longer conjugation length, its excess graphene content might increase the defects due to influence of polypyrrole nanowires, and probably generated micro galvanic corrosion that showed the corrosion-promotion activity [53]. Yeh J.-M., Chin C.-P., Chang S. Enhanced corrosion protection coatings prepared from soluble electronically conductive polypyrrole-clay nanocomposite materials. Zhang Y., Shao Y., Zhang T., Meng G., Wang F. High corrosion protection of a polyaniline/organophilic montmorillonite coating for magnesium alloys. It could be observed that the Rpore of neat epoxy coating gradually decreased from 7.3 105 cm2 to a much lower value (1.3 104 cm2). Hao Y., Sani L.A., Ge T., Fang Q. Phytic acid doped polyaniline containing epoxy coatings for corrosion protection of Q235 carbon steel.

Gnana kumar G., Kirubaharan C.J., Udhayakumar S., Ramachandran K., Karthikeyan C., Renganathan R., Nahm K.S. The SEM image (Figure 3a) revealed the uniform nanowire structure with an average diameter of about 50 nm and length of several micrometers. The electrochemical measurements were carried out to characterize the anticorrosive properties of blank epoxy, EPPyN and EPPyNG coatings using a CHI 660E electrochemical workstation (Chinstruments Co., Ltd., Shanghai, China) that was equipped with a conventional three-electrode cell with a saturated calomel electrode (SCE) as reference, a platinum counter electrode with 1 cm2 area, and a working electrode. PMC legacy view GJJ170680), National Natural Science Foundation of China (Contract No. Results of this study show that the durability of reinforced concrete (RC) structures with respect to corrosion could be enhanced by using ECR, especially in harsh climatic conditions. Schematic illustration of corrosion protection of the mild steel with (a) neat epoxy coating and (b) EPPyNG composite coating. ; project administration, J.Z. and Y.D. The calculated vcorr value of 8.9 105 mm/year for EPPyNG2 was about 100 times lower than that for blank epoxy coating. (Department of Chemical Engineering, College of Engineering, Infrastructure durability in harsh climate, https://doi.org/10.1108/IJBPA-12-2018-0099. The first semicircle at high frequency region and the second part at middle-low frequency region were due to the impedance of coating and corrosion reactions, respectively [48]. An overview of multifunctional epoxy nanocomposites. Kalendov A., Vesel D., Kohl M., Stejskal J. Federal government websites often end in .gov or .mil. Gharibi R., Yousefi M., Yeganeh H. Synthesis, characterization and assessment of poly(urethane-co-pyrrole)s derived from castor oil as anticorrosion coatings for stainless steel. Huang Y., Li H., Wang Z., Zhu M., Pei Z., Xue Q., Huang Y., Zhi C. Nanostructured Polypyrrole as a flexible electrode material of supercapacitor. If you think you should have access to this content, click to contact our support team. Bethesda, MD 20894, Web Policies The PPy nanowires/graphene nanocomposite coating exhibited improved anticorrosion performance in comparison with pure epoxy and epoxy/PPy nanowires samples. Effect of surface treatment of pigment particles with polypyrrole and polyaniline phosphate on their corrosion inhibiting properties in organic coatings. The blocks are subjected to Southern Exposure testing. ; methodology, P.X. Mohammadkhani R., Ramezanzadeh M., Saadatmandi S., Ramezanzadeh B. Sohail, M.G., Salih, M., Al Nuaimi, N. and Kahraman, R. (2019), "Corrosion performance of mild steel and epoxy coated rebar in concrete under simulated harsh environment", International Journal of Building Pathology and Adaptation, Vol. Polypyrrole nanowires/graphene (PPyNG) nanocomposites as anticorrosive fillers were prepared by in situ polymerization in order to improve the anticorrosion performance of waterborne epoxy coatings. Grundmeier G., Schmidt W., Stratmann M. Corrosion protection by organic coatings: Electrochemical mechanism and novel methods of investigation. Ammonium persulfate (APS), potassium permanganate (KMnO4), sulfuric acid (H2SO4), hydrogen peroxide (H2O2), N-methyl pyrrolidone (NMP), Sodium chloride (NaCl), and cetyltrimethylammonium bromide (CTAB) were obtained from Sinopharm Chemical Reagent Co., Ltd. (Shanghai, China). Kugler S., Kowalczyk K., Spychaj T. Influence of synthetic and bio-based amine curing agents on properties of solventless epoxy varnishes and coatings with carbon nanofillers. The dry coating thickness was around 37 m. Naveen M.H., Gurudatt N.G., Shim Y.-B. ); nc.moc.untsxj@6102oagief (F.G.); nc.moc.untsxj@7240fheh (H.H. International Journal of Building Pathology and Adaptation. Singu B.S., Yoon K.R. Zhong J., Gao S., Xue G., Wang B. ); moc.361@8211bewgnehz (W.Z. Pasquier A.D., Orsini F., Gozdz A.S., Tarascon J.M. The PPy nanowires/graphene nanocomposites (PPyNG) were synthesized through in situ chemical oxidative polymerization. For instance, especially, epoxy coatings have attracted many researchers due to their strong adhesion to substrates and excellent mechanical properties. Three weight concentrations of PPy nanowires additives had been prepared in order to achieve the optimal level of additives, and their anticorrosion properties are shown in Supplementary Materials, Figure S1 and Figure S2. The site is secure. about navigating our updated article layout. PPy with one-dimensional nanostructure, such as nanotube [24], nanorod [25], and nanowire [26], are used in various applications including sensors, supercapacitors and battery electrodes [13,27,28]. The corrosion performance of mild steel and ECR in concrete under a simulating splash zone environment is evaluated. The electroactive nature of PPy allows for it to oxidize the metal substrate, which results in the formation of a passive oxide layer at the interface between the PPy and underlying metal substrate [14]. A study on the anticorrosion performance of epoxy nanocomposite coatings containing epoxy-silane treated nano-silica on mild steel substrate. Visit emeraldpublishing.com/platformupdate to discover the latest news and updates, Answers to the most commonly asked questions here. When comparing to the FTIR spectra of PPyN, all peaks had also appeared in the PPyNG nanocomposites. However, from Figure 3d, the granular morphology of PPyNG3 was observed. The flake graphite powder (325 mesh) was purchased from Sigma-Aldrich Chemicals (Shanghai, China).

Dutta D., Ganda A.N.F., Chih J.-K., Huang C.-C., Tseng C.-J., Su C.-Y. The investigated coatings in this study consisted of the epoxy without the addition of filler as well as with the incorporation of PPy nanowires and PPy nanowires/graphene as the functional additives. Potentiodynamic polarization plots, impedance measurements, and fitted Rpore and Cc were used to study the anticorrosion performance of the coatings. FOIA Dubal D.P., Caban-Huertas Z., Holze R., Gomez-Romero P. Growth of polypyrrole nanostructures through reactive templates for energy storage applications. Liu S., Gu L., Zhao H., Chen J., Yu H. Corrosion Resistance of Graphene-Reinforced Waterborne Epoxy Coatings. Licensee MDPI, Basel, Switzerland. Furthermore, the higher ba/bc ratio of EPPyNG2 was observed, which revealed a reduction of the anodic dissolution [23]. The scanning electron microscopy (SEM) images of PPyN and PPyNG composites were obtained while using a Zeiss Sigma FE-SEM (Carl Zeiss AG, Geraniah, Germany). The radius of capacitive impedance loop in high-frequency domain diminished during the immersion, which implied declined corrosion protective properties for mild steel. Kalendov A., Vesel D., Kohl M., Stejskal J. Anticorrosion efficiency of zinc-filled epoxy coatings containing conducting polymers and pigments. It would not only result in economic losses, but also threaten the safety of industrial production. Armelin E., Pla R., Liesa F., Ramis X., Iribarren J.I., Alemn C. Corrosion protection with polyaniline and polypyrrole as anticorrosive additives for epoxy paint. Graphene has higher aspect ratio than clay platelet, which can simultaneously improve not only the barrier properties, but also several mechanical, functional, and thermal properties of epoxy coatings [21,22]. The characteristic polypyrrole peaks located at 1558 and 1478 cm1 were due to the asymmetric and symmetric ring-stretching modes, respectively [31]. Firstly, the PPy nanowires and PPyNG nanocomposites were completely dispersed in 10 mL of deionized water with a high-speed dispersion and then added into 30 g waterborne epoxy resin.

Ma Z., Chen P., Cheng W., Yan K., Pan L., Shi Y., Yu G. Highly Sensitive, Printable Nanostructured Conductive Polymer Wireless Sensor for Food Spoilage Detection. The electrochemical impedance spectroscopy (EIS), linear polarization resistance (LPR) and Tafel plot are performed to measure the polarization resistance and corrosion current densities of these rebars. The Q235 mild steels (C: 0.14%, Mn: 0.3%, S: 0.05%, P: 0.045%, and rest being Fe) with area of 42 mm 10 mm were purchased from Biuged Laboratory Instruments (Guangzhou) Co., Ltd. (Guangzhou, China). Open circuit potential (OCP) measurements, Tafel polarization curves, and electrochemical impedance spectroscopy (EIS) using an electrochemical workstation evaluated the anticorrosion properties of the waterborne epoxy/PPyNG coatings (EPPyNG). In a typical process, 0.31 mL pyrrole monomer and 0.91 g CTAB were added in a mixture of 125 mL 0.2 M hydrochloric acid and graphene-NMP dispersion and stirred for 2 h at ambient temperature, and then cooled to 05 C. A significantly positive shift Ecorr of 565 mV was obtained for the composites coating with PPyN, confirming that EPPyN engaged in redox reactions, resulting in the formation of metal oxide passive layer [20,42]. Figure 1 shows the preparation process for the fabrication of waterborne epoxy/PPyNG coatings (EPPyNG) coating materials. [29]. The bare mild steels or mild steels with coatings were sealed while using sealant (paraffin: Rosin = 1:1) and Teflon to leave 1 cm2 area opening to the electrolytic solution. Subsequently, 30 wt % H2O2 was added to decompose the insoluble manganese dioxide. The new PMC design is here! Electrochemical behaviour of LiMn2O4PPy composite cathodes in the 4-V region. The prepared epoxy coatings that were loaded with PPy nanowires, PPyNG1, PPyNG2, and PPyNG3 were denoted as EPPyN, EPPyNG1, EPPyNG2 and EPPyNG3, respectively. The ratio was 0.1304, 0.1328, 0.1427, and 0.1515 for PPy, PPyNG1, PPyNG2, and PPyNG3, respectively, which suggested that the conjugation length increased with further incorporation of the graphene. Jiang S., Liu Z., Jiang D., Cheng H., Han J., Han S. Graphene as a nanotemplating auxiliary on the polypyrrole pigment for anticorrosion coatings. 657-678. https://doi.org/10.1108/IJBPA-12-2018-0099, Copyright 2019, Emerald Publishing Limited. The .gov means its official. sharing sensitive information, make sure youre on a federal It was worth noting that the CN stretching vibrations peak of PPyNG nanocomposites had been downshifted to 1310 cm1, which was probably due to the interactions between graphene layers and aromatic polypyrrole rings [34]. The result of the SEM images indicated that the morphology of PPy nanowires was affected by the higher content graphene. The surface treatment of pigment with PPy is found to be beneficial to the anticorrosion and mechanical properties of the epoxy paint [18]. The impedance modulus dramatically decreased after 15 days and then progressively reduced with the increasing immersion time for all studied coatings, probably owing to the penetration of water and movement of ions through the coatings [50]. Many researchers have investigated polymer composites incorporating various functional fillers [5], such as montmorillonite [6], carbon nanotubes [7], graphene [8], and intrinsically conducting polymers (ICPs) [9], to overcome this problem. Lei Y., Qiu Z., Liu J., Li D., Tan N., Liu T., Zhang Y., Chang X., Gu Y., Yin Y. The following are available online at https://www.mdpi.com/2073-4360/11/12/1998/s1, Figure S1: t Water absorption of epoxy/polypyrrole nanowires coatings filled with 0%, 0.3%, 0.5% and 0.7% polypyrrole nanowires., Figure S2: Tafel curves of mild steel with coatings of epoxy/polypyrrole nanowires coatings filled with 0%, 0.3%, 0.5% and 0.7% polypyrrole nanowires in 3.5% sodium chloride solution after 20 days. Martin-Gallego M., Verdejo R., Lopez-Manchado M.A., Sangermano M. Epoxy-Graphene UV-cured nanocomposites. ); moc.361@pxyranidro (P.X. EIS is observed to be a suitable tool to detect the defects in epoxy coatings. Lei W., He P., Wang Y., Zhang S., Dong F., Liu H. Soft template interfacial growth of novel ultralong polypyrrole nanowires for electrochemical energy storage. Arefinia R., Shojaei A., Shariatpanahi H., Neshati J. Anticorrosion properties of smart coating based on polyaniline nanoparticles/epoxy-ester system. For the convenience discussion, the present nanocomposite referred to as PPyNG, and nanocomposite coating corresponded to the epoxy/PPyNG coating. Hence, the anti-corrosion performance of the EPPyNG nanocomposite coatings was significantly improved.

The corrosion rate, vcorr (mm/year) was obtained from Equation (1) [44]: where the molecular weight (M) is 55.85 g/mol for Q235, Icorr is the corrosion current density (A/cm2), n is 2 for the oxidation of steel, and the density () is 7.85 g/cm3 for Q235, 3270 is a constant. Learn more The broad band at 30003500 cm1 arose from NH stretching vibrations [30]. Up to now, there has been no report on using PPy nanowire as additive for waterborne anticorrosion coatings. Ding J., Zhao H., Xu B., Zhao X., Su S., Yu H. Superanticorrosive Graphene Nanosheets through Deposition of Boron Nitride Nanodots. (a) Rpore and (b) Cc values with immersion in 3.5 wt % NaCl solution. Therefore, the EPPyNG3 (1.6 106 cm2) displayed worse anticorrosive property when compared with EPPyNG2. Loading PPy can also enhance the corrosion inhibiting properties of zinc-filled epoxy coatings [16,17]. Synthesis, Structural, and Morphological Characterizations of Reduced Graphene Oxide-Supported Polypyrrole Anode Catalysts for Improved Microbial Fuel Cell Performances. ; writingoriginal draft preparation, J.Z. This research was funded by Natural Science Foundation of Jiangxi Education Department (Contract No. In this paper, the PPy nanowires (PPyN) were prepared by a soft template method. The passivation effect of the PPy nanowires contributed to the effective inhibiting corrosive effect. ; resources, W.Z. However, even these coatings fail over prolonged exposure in corrosive media [4]. Smart release corrosion inhibitor pigments based on organic ion-exchange resins. It might be ascribed to the fact that the strong interfacial interaction between PPy and graphene induced more electrons that were delocalized either in the pyrrole units or in the benzene ring units of graphene [35,37]. and H.H. The higher barrier properties of nanocomposite coating and passivation effect of polypyrrole nanowires were beneficial in corrosion protection. Navarchian A.H., Joulazadeh M., Karimi F. Investigation of corrosion protection performance of epoxy coatings modified by polyaniline/clay nanocomposites on steel surfaces. 100 g graphite (1 wt % equiv., 325 mesh) was then added in batches under stirring at 35 C for 2 h. The black flakes were filtered through a 200-mesh sieve and poured into 2 L of ice water after reaction. Williams G., Geary S., McMurray H.N. Integration with montmorillonite and graphene turns out to be an effective method for avoiding aggregations and improve dispersion of PPy in the polymer matrix, which contributes to a great corrosion protection enhancement [6,19,20]. Despite these advantages, the aggregation tendency of PPy particles is a major restriction of the processing and application of epoxy/PPy coating. By addition of PPyNG, the Ecorr dramatically increased to 537 mV with 1 wt % graphene and 482 mV with 2 wt % graphene. Fabrication of graphene oxide/polypyrrole nanowire composite for high performance supercapacitor electrodes. Revisiting graphenepolymer nanocomposite for enhancing anticorrosion performance: A new insight into interface chemistry and diffusion model. The isolated graphene nanosheets could also be seen due to increasing concentration of graphene nanosheets. Nguyen Thi T., Dinh Thi Mai T., Pham Thi N., Nguyen Thu P., Vu Thi Hai V., Ngo Quang M. Enhanced Anti-Corrosion Protection of Carbon Steel with Silica-Polypyrrole-Dodecyl Sulfate Incorporated into Epoxy Coating. NPRP 7-410-2-169. The mild steel that was coated with EPPyNG2 exhibited a Rp value of 5.6 106 cm2, which was higher than that of bare mild steel, neat epoxy, EPPyN, EPPyNG1, and EPPyNG3 coated ones. Before A precooled aqueous solution of 10 mL 0.2 M HCl containing 4 mmol APS was added into above solution in batches. The potential of EPPyNG3 coating dropped sharply to 0.70 V after immersion 20 days, revealing that excess graphene was detrimental to the anticorrosion property [40]. Nyquist and Bode plots of the coatings: (a,b) blank, (c,d) EPPyN, (e,f) EPPyNG1, (g,h) EPPyN2, and (i,j) EPPyNG3. The OCP value tended to decrease with the immersion time for all of the studied coatings. Rp is the polarization resistance calculated by the slope of the polarization curve at the Ecorr according to the SternGeary Equation (2) [45]: Here, ba and bc are the anodic and cathodic Tafel slopes, Icorr is the corrosion current density. Figure S4. The 0.5% additive based on the total formulation was finally determined.

The corrosion current density (Icorr), corrosion potential (Ecorr), anodic Tafel slope (ba), and cathodic Tafel slope (bc) were estimated from the Tafel extrapolation of anodic and cathodic lines to the point of intersection. Scanning electron microscopy (SEM) images of the (a) PPyN, (b)PPyNG1, (c)PPyNG2, and (d) PPyNG3. in an ice-water bath. After that, the PPyNG nanocomposites were incorporated into waterborne epoxy coatings to study their anticorrosion performance for mild steel. Layered Graphene Oxide Nanostructures with Sandwiched Conducting Polymers as Supercapacitor Electrodes. Figure 8 shows the time-dependent behavior of Rpore and Cc on the basis of the above fitting models. Knife-peel test was performed to assess the adhesion between epoxy and underlying steel after two years of exposure. The EPPyNG2 coating had better barrier properties when compared to neat epoxy, because the well dispersed PPyNG could fill the structural and pinhole porosity of neat epoxy and then inhibited the water penetration. The conjugation length of EPPyNG2 was longer than those of EPPyN and EPPyNG1, which resulted in electrons easier delocalization and in favor of the formation of passivation layers [51,52]. In this study, the PPy nanowires were synthesized while using CTAB as soft template, and combined with graphene nanosheets by in situ oxidation polymerization. The impedance modulus at low frequency (|Z|0.01Hz) was used as a semi-quantitative standard of coatings protective performance for the Bode patterns [49], as summarized in Table 2. The Effect of Conducting Polyaniline/Graphene Nanosheet Content on the Corrosion Behavior of Zinc-Rich Epoxy Primers in 3.5% NaCl Solution. Metal corrosion is a disturbing phenomenon in which chemical or electrochemical reactions damage metal materials. You may be able to access teaching notes by logging in via your Emerald profile. Enhanced performance of lithium sulfur battery with self-assembly polypyrrole nanotube film as the functional interlayer. However, the coating with excess graphene (EPPyNG3) exhibited lower Ecorr than EPPyNG2, probably because larger fraction of graphene affected the growth of PPy nanowires and induced the defects in PPyNG3 composites [38], which was in agreement with the results of SEM.

The purpose of this paper is to present the results of a two-year long study carried out in order to evaluate the corrosion performance of mild steel bare bars (BB) and epoxy-coated rebar (ECR) in concrete under a simulated harsh environment of chlorides. The statements made herein are solely the responsibility of the authors and do not necessarily reflect the opinions of the Sponsor. (a,b) Equivalent electrical circuits of the coatings. The electrochemical impedance spectroscopy (EIS) measurements were collected in the frequency range of 100 kHz to 0.01 Hz while using an alternating current signal with the amplitude of 5 mV.

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