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Ali Dehghani,Ghasem Bahlakeh,Bahram Ramezanzadeh,Mohammad Ramezanzadeh 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.84 No.-
In the present study, comprehensive research efforts were made to experimentally/theoretically examinethe corrosion protection capability of Laurus nobilis leaves extract for carbon steel in an acidic mediumcomposed of 1 M HCl. The experimental EIS results evidenced that upon steel exposure to a corrosiveelectrolyte containing 400 ppm L. nobilis leaves extract the maximum protection performance of 92% wasobtained after 2.5 h. The experiments of potentiodynamic polarization proposed a mixed-type anodic/cathodic anti-corrosion action along with small cathodic prevalence. The electronic features establishedby the DFT approach highlighted that the surface adsorption mechanism could be described by donor-acceptor interactions.
Ali Dehghani,Ghasem Bahlakeh,Bahram Ramezanzadeh,Amir Hossein Mostafatabar 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.88 No.-
In the present work, for thefirst time, a series of unique zinc-centered metal–organicfilms with highanti-corrosion potency was fabricated on the steel surface through the covalent/non-covalent bonding/interactions between the naturalflavonoid based-molecules (Quercetin) and Zn2+/Fe2+ metal-cations. Thevisualized steel surface micro-scale microstructure by FE-SEM proved that the Quercetin:Zn based metal–organicfilm covered the metallic surface significantly. Also, the elemental analysis of the protectedsurfaces via GIXRD, EDS, and mapping experiments illustrated that the metal–organic compoundssufficiently adsorbed. Tafel curves achievements depicted that the Quercetin:Zn based metal–organicfilmcould efficiently protect the iron surface via both O2 reduction/Fe oxidation mechanisms and theoutcomes indicated that in the presence of Quercetin (200 ppm):Zn (600 ppm) inhibitors the mostprotectivefilm against chloride solution was attained (97% efficiency) after 24 h of iron exposure. Additionally, the theoretically derived outcomes applying MC/MD modeling associated with DFTcalculations ascertained the interactions followed by adsorption of complexes over the M-Steel.
Mohammad Ramezanzadeh,Ghasem Bahlakeh,Zahra Sanaei,Bahram Ramezanzadeh 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.74 No.-
The effects of steel surface treatment by a novel nanofilm based on praseodymium oxide on theinterfacial adhesion, corrosion protection properties and cathodic delamination rate of a polyester-melamine coating were studied by combined experimental and theoretical molecular dynamics (MD)and quantum mechanics (QM) techniques. Field emission-scanning electron microscopy (FE-SEM),atomic force microscopy (AFM), and X-ray photoelectron spectroscopy (XPS) were employed tocharacterize the surface morphology and chemical composition of nanofilm. The results obtained fromelectrochemical impedance spectroscopy, cathodic delamination and pull-off tests demonstrated thesignificant improvement of steel/polymer interfacial adhesion, the decrease of coating disbonding rateand the increase of corrosion protection performance by the aid of steel surface decoration by nanofilm. Furthermore, the theoretical outcomes derived from atomistic MD simulations of metal/polymerinterface conducted in dry and wet environments further evidenced the strengthened coating adhesiononto surface-treated steel. It was also theoretically observed that the interfacial electrostatic interactionswere the major force in coating binding to untreated/treated steel substrate.
Mohammad Ramezanzadeh,Ghasem Bahlakeh,Bahram Ramezanzadeh,Mehran Rostami 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.72 No.-
Mild steel surface was chemically treated by Neodymium (Nd) oxide nanofilm to effectively reduce thecathodic delamination arte and increase the adhesion and corrosion prevention properties of fusionbondedepoxy (FBE). It was observed that the Ndfilm uniformly covered the steel surface and improvedthe surface free energy, roughness and work of adhesion. Results revealed that applying Nd layerexcellently promoted the interfacial metal/FBE adhesion (dry/wet), decreased the cathodic delaminationrate and enhanced the FBE coating protection function. Furthermore, theoretical simulations revealed thestronger adsorption of coating molecules on the neodymium oxide as compared with the iron oxides.
Mohammad Ramezanzadeh,Ghasem Bahlakeh,Bahram Ramezanzadeh,Zahra Sanaei 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.77 No.-
The inhibition of carbon steel corrosion in chloride solution containing Nettle leaves extract (NLE) andzinc nitrate (ZN) was investigated by electrochemical techniques. Theoretical studies based on moleculardynamics (MD) simulation and density functional theory (DFT) were performed to evaluate theadsorption process and the synergistic effects between NLE and ZN. Electrochemical analyses resultsconfirmed effective synergistic inhibition between organic inhibitors existed in NLE and zinc cations. 96%inhibition efficiency was obtained when 400 ppm NLE was combined with 400 ppm Zn(NO3)2. Thetheoretical results evidenced that all considered organic-inorganic inhibitors adhered to steel surface,reflecting their corrosion inhibition effect.
Roshanak Miraftab,Behzad Karimi,Ghasem Bahlakeh,Bahram Ramezanzadeh 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.53 No.-
The effects of surface modification of graphene oxide (GO) and graphene oxide quantum dot (GOQD) nanosheets by conductive polyaniline nanofibers on the interfacial interactions and mechanical properties of the epoxy composite were studied through complementary experimental and theoretical ab initio quantum mechanics approaches. The experimental results showed that functionalization of nanosheets with Pani remarkably improved the thermal stability and mechanical properties of the nanocomposites. The outcomes derived from DFT methods demonstrated that Pani chains adsorbed to GO surfaces via physisorption (i.e., H-bonding and p–p stacking) and chemisorption (i.e., proton transfer from polyaniline to GO) mechanisms.
Novel bi-functional RGO-HPSE-Zn@epoxy nanocomposite with superior corrosion protection potency
Amir Hossein Mostafatabar,Ghasem Bahlakeh,Bahram Ramezanzadeh 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.108 No.-
Recently, the employment of organic coatings (i.e. Epoxy resin (EP)), become common to provide immunityfor metals in corrosive environments. The lack of self-healing/active protection in EP, as well asshort-term barrier performance, inspired authors to provide superior barrier/self-healing protectionpotential for EP by designing a highly durable control-release system based on a novel compositemetal–organic polymeric matrix. Therefore, in this work, first, the graphene oxide nanosheets were synthesized(GO), then reduced and also functionalized by the extracted bio-compatible organic-based moleculesof Heracleum persicum seed (RGO-HPSE), and finally modified via zinc metal cations doping (RGOHPSE-Zn). The successful synthesis of nano-pigments was characterized, applying a variety of analyses. Further, the electrochemical approaches were employed for solution-phase investigation and demonstrated66% and 86% anti-corrosion capability for RGO-HPSE and RGO-HPSE-Zn, respectively. Afterward, 0.2 wt.% of nano-pigments were incorporated into the EP coating network to provide activeself-healing performance and enhance the barrier behavior of the EP coating. Applying EIS technique,the coatings were evaluated in two forms of scratched and intact. The 83,973 ohm.cm2 and 122,412ohm.cm2 of impedance values were achieved from the scratched RGO-HPSE/EP and RGO-HPSE-Zn/EPcoatings, respectively, while the maximum impedance values of scratched neat EP was recorded at35,673 ohm.cm2. The superior barrier performance of RGO-HPSE-Zn/EP intact coating was achievedthrough negligible descend of |Z|10mHz value during 10 weeks of immersion (1010.5 ohm.cm2 ? 1010.2ohm.cm2).
Zahra Sanaei,Mohammad Ramezanzadeh,Ghasem Bahlakeh,Bahram Ramezanzadeh 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.69 No.-
Rosa canina fruit extract was utilized for mild steel corrosion inhibition in 1 M HCl solution. The inhibitionefficiency of inhibitor was studied by electrochemical impedance spectroscopy (EIS) and potentiody-namic polarization test. Results revealed that R. canina fruit extract acted as a mixed type inhibitor andremarkably reduced the corrosion current density of mild steel from 110 mA/cm2 (0 ppm) to 44 mA/cm2(800 ppm). The maximum corrosion inhibition efficiency (about 86%) was obtained using 800 ppminhibitor. The inhibitor adsorption on the mild steel surface significantly increased the water contactangle (about 50%).
Niloufar Notghi Taheri,Bahram Ramezanzadeh,Mohammad Mahdavian,Ghasem Bahlakeh 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.63 No.-
In this study, the negatively charged graphene oxide (GO) nanosheets were modified with polyaniline (PAni) nanofibers and zinc cations through a layer-by-layer assembly method. The structure, morphology and thermal behavior of GO, GO-PAni and GO-PAni-Zn were characterized. The active corrosion inhibition performance of GO-PAni-Zn nanocomposite was demonstrated by electrochemical impedance spectroscopy (EIS) and polarization tests. The results confirmed high cation exchange capability and better anti-corrosion properties of GO-PAni-Zn sample than others. The theoretical outcomes derived from quantum mechanics computations revealed that inorganic zinc cations demonstrated electrostatic and cation-π interactions with emeraldine, implying the zinc propensity to bind to PAni Chains.
Ali Asghar Javidparvar,Reza Naderi,Bahram Ramezanzadeh,Ghasem Bahlakeh 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.72 No.-
Graphene oxide (GO) was used as a smart pH-sensitive carrier for delivery of green corrosion inhibitors tothe active corrosion sites of metal. Results demonstrated the physisorption and chemisorption of ceriumonto the GO surface. The open circuit potential, polarization test and electrochemical impedancespectroscopy measurements as well asfield-emission scanning electron microscopy and energydispersive spectroscopy were used to study the corrosion inhibition power of GO–Ce system. Resultsrevealed that as a result of cerium oxide/hydroxidefilm generation on the cathodic regions, the corrosionof mild steel was remarkably inhibited in the chloride solution.