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RISS 인기검색어
- 검색키워드
- 저자 : Amir Hossein Mostafatabar (검색결과 2 건)
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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).
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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.
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