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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.
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,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,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.
Improved performance of cerium conversion coatings on steel with zinc phosphate post-treatment
B. Ramezanzadeh,H. Vakili,R. Amini 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.30 No.-
The steel samples were pre-treated by cerium conversion layer. Then, zinc phosphate conversion coatingwas used as sealing agent for the cerium conversion layer to enhance its corrosion resistance. Thecorrosion performance and surface characteristics of the samples were characterized by electrochemicalimpedance spectroscopy, scanning electron microscope and X-ray photoelectron spectroscopy. Resultsrevealed that the post-treatment of the cerium conversion coating by phosphate coating significantlyincreased its corrosion resistance. A denser conversion layer with less cracks were precipitated on thesteel surface after post-treatment by zinc phosphate. The surface free energy was significantly increasedafter post-treatment by zinc phosphate.
Enhancement of silane coating protective performance by using a polydimethylsiloxane additive
M. Mahdavian,B. Ramezanzadeh,M. Akbarian,M. Ramezanzadeh,P. Kardar,E. Alibakhshi,S. Farashi 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.55 No.-
This work intends to study the effect of a polydimethylsiloxane additive on the protection performance of a hybrid silane coating on mild steel. Electrochemical impedance spectroscopy, polarization and electrochemical noise measurements and salt spray showed an increase in corrosion resistance of the silane coating in the presence of the additive. Silane films were examined by FTIR, water droplet contact angle, Vickers hardness and SEM. Results showed decrease in crosslinking density in the presence of the additive. Superior corrosion protection in the presence of additive was attributed to the enhanced hydrophobic character and flexibility of the coating.
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%).
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.
Mohammad Ebrahim Haji Naghi Tehrani,Mohammad Ramezanzadeh,Bahram Ramezanzadeh 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.95 No.-
For thefirst time, a metal-organicfilm with high anti-corrosion potency was constructed over the mildsteel surface using Malva sylvestris (M.S) and zinc cations (Zn2+). The mild steel panels were immersed inthe simulated seawater solution (3.5%wt. NaCl solution) containing different loadings of Zn:M.Sinhibitors. The electrochemical impedance spectroscopy (EIS) and open circuit potential (OCP)measurements were performed at a different time step up to 240 h. The potentiodynamic polarizationtest was carried out to determine the inhibitor's inhibition mechanisms. The synergistic inhibitionimpact of the Zn:M.S before and after immersion was analyzed by Ultraviolet-Visible (UV–vis)spectroscopy. The protectivefilm formed on the surface was studied by the Fourier transform infrared(FT-IR), Raman, grazing incidence X-ray diffraction (GIXRD), scanning electron microscopy-energydispersive spectroscopy (SEM-EDS), atomic force microscopy (AFM), and contact angle (CA) techniques. The EIS results evidenced that applying various ratios of Zn:M.S resulted in more than 98% corrosioninhibition efficiency (IE), which was stable up to 240 h. Meanwhile, the outstanding corrosion resistanceof 170 kV.cm2 in 300:700 ppm Zn:M.S was recorded.