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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,Bahram Ramezanzadeh,Morteza Ganjaee Sari,Mohammad Reza Saeb 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.82 No.-
Epoxy coating was reinforced with polyamidoamine dendrimer-reduced graphene oxide nanosheets(GO-PAMAM) to obtain a high-performance anti-corrosion system. The GO-PAMAM was characterized byX-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD) and UV–vis analysis. Results confirmedthat PAMAM molecules successfully grafted on the GO surface, resulting in the lamellae d-spacingincrement. Results of electrochemical impedance spectroscopy (EIS) and salt spray test evidenced that inthe presence of 0.2 wt.% GO-PAMAM the epoxy coating corrosion protection properties were effectivelyenhanced. It was found from the results that the PAMAM could enhance the GO particle dispersion in theepoxy through increasing the GO nanosheets interlayer space and surface hydrophilic nature reduction.
Mohammad Ramezanzadeh,Zahra Sanaei,Bahram Ramezanzadeh 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.62 No.-
The effect of steel surface treatment by an eco-friendly praseodymium (Pr) oxide nanofilm on the corrosion protection properties and cathodic delamination of a fusion-bonded epoxy coating (FBE) was studied. The results of AFM, FE-SEM and contact angle tests revealed that a crack free praseodymium oxide nanofilm uniformly covered the steel surface. Results of EIS and salt spray tests revealed that the steel surface treatment by Pr film significantly enhanced the FBE coating corrosion protection performance. Results of cathodic delamination test showed significant decrease in the FBE cathodic delamination rate. Results of pull-off test revealed the FBE/Steel interfacial adhesion bonds promotion.
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.
Reza Samiee,Bahram Ramezanzadeh,Mohammad Mahdavian,Eiman Alibakhshi,Ghasem Bahlakeh 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.78 No.-
In the current paper, the graphene oxide (GO) nano-sheets were benefited as a promising nano-carrier forPr3+ cations for corrosion inhibition. The optimal experimental condition for Pr3+ cations loading wasobtained. The thermodynamic and kinetic of adsorption process were studied in detail. According to theresults of ICP analysis, the highest adsorption capacity of GO was found in the initial pH of 7, 0.00319 g ofadsorbent dosage, 600 ppm of initial Pr3+ concentration, 30 min contact time and at the temperature of35 C. The loading and desorption efficiency of Pr3+ cations were characterized by series of techniquessuch as UV–vis, XPS, and HR-TEM. Adsorption of Pr3+ cations onto GO was simulated by quantummechanics calculations. Electrochemical analysis showed dual active-barrier protective functioning ofPr3+ loaded GO nano-sheets in the silane matrix. The formation of a protectivefilm was confirmed by theSEM images.
Nafise Parhizkar,Bahram Ramezanzadeh,Taghi Shahrabi 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.64 No.-
This paper aims at improving the cathodic disbonding, corrosion protection and adhesion properties of epoxy coating through steel substrate treatment by cerium nanofilm. For this purpose, the cerium film was modified by graphene oxide nanosheets, which are covalently functionalized with silane coupling agent. The performance of this coating was studied by electrochemical impedance spectroscopy, Pull-off adhesion and cathodic delamination tests and the morphology of the modified cerium film was investigated by field-emission scanning electron microscopy. Results revealed that modifying the cerium nanofilm led to the better adhesion strength, corrosion protection performance and lower cathodic delamination rate of epoxy coating.
Farzaneh Ozeiry,Mohammad Ramezanzadeh,Bahram Ramezanzadeh,Ghasem Bahlakeh 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.108 No.-
Here, to fabricate an epoxy coating (EP) possessing premier mechanical and thermal features, a nanocompositeof oxidized multiwall nano carbon tube/ ZIF-8 (O-MWCNT@ZIF-8) was prepared through a onestepfabrication approach of ZIF-8 on the O-MWCNT surface through two-different hydrothermal andco-precipitation methods, that are labeled as O-MWCNT-ZIF-8-H/EP and O-MWCNT-ZIF-8-CO/EP, respectively. After introducing the prepared nanocomposite into the epoxy resin, DMTA and tensile tests wereapplied on the prepared coatings to identify the interactions between the EP/Particles and investigate theresultant thermomechanical properties of the final composites. It was indicated that through the incorporationof 0.15 wt.% of the prepared nanoparticles into the EP matrix, a remarkable enhancement couldbe achieved on its thermomechanical properties. It is also worth noting that the storage modulus showeda rise of about 7.5% and 1.1% and tensile strength increased about 70% and 40%, while Tg reduced about12 C and 16 C in the case of O-MWCNT-ZIF-8-CO/EP and O-MWCNT-ZIF-8-H/EP samples, respectively,in comparison to the unmodified epoxy (Neat EP) sample. Moreover, the remaining weights of 75% and77% for O-MWCNT-ZIF-8 compared with 82% for O-MWCNT at 600 C evidenced the lower thermal stabilityof the ZIF-8 modified CNT.
Samaneh Saadatmandi,Morteza Asghari,Bahram Ramezanzadeh 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.75 No.-
In this study, graphene oxide nano-platforms were functionalized/reduced (rGO-His) by a greenreductant based on histamine. Additionally, the rGO-His was modified by zinc metal cations in two ways(I and II) and characterized by FT-IR, XRD, XPS, HR-TEM and FE-SEM. Then, by dynamic mechanicalthermal analysis (DMTA), tensile test and thermogravimetric analysis (TGA) the mechanical/thermalproperties of the epoxy composite coatingsfilled with rGO-His and rGO-His-Zn (I and II) were evaluated. Results of tensile and DMTA analyses proved significant increment in tensile strength, elongation atbreak, cross-linking density and thermal stability of the coating in the presence of rGO-His.
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.