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Experimental and computational chemical studies on the cationic furanylnicotinamidines as novel corrosion inhibitors in aqueous solutions

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Chinese Journal of Chemical Engineering 2020年第2期28卷 477-491页

作者： Abdelaziz S.Fouda mohamed A.Ismail rabab m.abou-shahba Walaa A.Husien Esraa S.EL-Habab Ashraf S.abousalem Department of Chemistry Faculty of ScienceEl-Mansoura UniversityEl-Mansoura 35516Egypt Department of Chemistry Faculty of ScienceAl-Azhar UniversityEgypt Quality Control Laboratory Operation DepartmentJOTUNEgypt

The corrosion inhibition action of three newly synthesized furanylnicotinamidine derivatives namely: 6-[5-{4(dimethylamino)phenyl}furan-2-yl]nicotinamidine(mA-1256), 6-[5-(4-chlorophenyl)furan-2-yl]nicotinamidine(mA-1266), and 6-[5-{4-(dimethylamino)phenyl}furan-2-yl]nicotinonitrile(mA-1250) on carbon steel(C-steel) was investigated in 1.0 mol·L-1 HCl solution by weight loss(WL), potentiodynamic polarization(PP), electrochemical impedance spectroscopy(EIS), and electrochemical frequency modulation(EFm)techniques. morphological analysis was performed on the uninhibited and inhibited C-steel using atomic force microscope(AFm) and Infrared Spectroscopy(ATR-IR) methods. The effect of temperature was studied and discussed. Inspection of experimental results revealed that the inhibition efficiency(IE) increases with the incremental addition of inhibitors and with elevating the temperature of the acid media. The adsorption of furanylnicotinamidine derivatives on C-steel follows Temkin’s isotherm. PP studies indicated that the investigated compounds act as mixed-type inhibitors and showed that p-dimethylaminophenyl furanylnicotinamidine derivative(mA-1256) was the most efficient inhibitor among the other studied derivatives with IE reached(95%)at 21 × 10-6 mol·L-1. mA-1266 is highly soluble in aqueous solution and has non-toxicity profile with LC50 N 37 mg·L-1. Thus, mA-1266 can be a promising green corrosion inhibitor candidate with IE N 91% at 21× 10-6 mol·L-1. The experiments were coupled with computational chemical theories such as quantum chemical and molecular dynamic methods. The experimental results were in good agreement with the computational outputs.

关键词： Acid corrosion C-steel Furanylnicotinamidines Green inhibitor Computational chemical methods

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Evaluation of Some Insulated Greases Prepared from Rubber and Bitumen Thickeners

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International Journal of Organic Chemistry 2013年第1期3卷 71-80页

作者： Amaly mohamed Hassan Azza mahmoud mazrouaa mona Ali Youssif rabab mohamed abou shahba maha Ali Youssif Egyption Petroleum Research Institute Cairo Egypt. Faculty of Science Al-Azhar University Cairo Egypt.

The wax gel grease (S0) was prepared from a mixture of 2.3:1 base oil blend (base oil grade 260/290, transformer oil), and microcrystalline wax in the presence of 0.1% - 2% of polyoxyethylene sorption nano-palmitate as antioxidant and 2,2 methylene bis (4-methyle-6-tertiary butyl phenol) as anticorrosion. It was found that the prepared Wax gel grease has inconvenient physico-chemical and dielectric properties, so in order to improve its physico-chemical properties (viscosity, penetration, dropping point and water resistance) and dielectric Properties (dielectric constant, dielectric loss and volume resistivity), Butyl rubber, isoprene rubber and bitumen were added separately as thickening agents to the prepared wax gel in certain proportion at certain frequency range 1 - 1000 KHz at 35°C. The best dielectric properties were achieved by adding butyl rubber to the prepared wax gel.

关键词： Wax Gel Butyl Rubber Grease Isoprene Rubber Grease Bitumen Grease and Dielectric Properties

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Effect of Catharanthus roseus (Vince rosea) and Turmeric (Curcuma longa) Extracts as Green Corrosion Inhibitors for mild Steel in 1 m HCl

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materials Sciences and Applications 2016年第10期7卷 654-671页

作者： rabab mohamed abou shahba Abd El-Aziz El-Sayed Fouda Azza El-Sayed El-Shenawy Amina Salah mohamed Osman Department of Chemistry Faculty of Science El-Azhar University Nasr city Egypt Department of Chemistry Faculty of Science El-Mansoura University El-Mansoura Egypt

The corrosion inhibition of mild steel by Catharanthus roseus (Vince rosea) and Turmeric (Curcuma longa) extracts as green inhibitors in 1 m HCl solutions has been investigated by using potentiodynamic polarization, electrochemical impedance spectroscopy (EIS), hydrogen evolution measurements and scanning electron microscope (SEm) techniques. Results obtained show that these investigated compounds are good inhibitors and act as mixed type inhibitors. The inhibition efficiencies increase with increasing inhibitor concentration. The SEm results show the formation of protective film on the mild steel surface in the presence of Catharanthus roseus and Turmeric extracts. The results obtained from different tested techniques are in good agreement.

关键词： Catharanthus roseus Extract Turmeric Extracts mild Steel

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