scholarly journals Adsorption and anticorrosive behavior of aromatic epoxy monomers on carbon steel corrosion in acidic solution: computational studies and sustained experimental studies

RSC Advances ◽  
2019 ◽  
Vol 9 (26) ◽  
pp. 14782-14796 ◽  
Author(s):  
Omar Dagdag ◽  
Zaki Safi ◽  
Hamid Erramli ◽  
Omar Cherkaoui ◽  
Nuha Wazzan ◽  
...  
Keyword(s):  
Carbon Steel ◽  
Corrosion Inhibition ◽  
Acidic Solution ◽  
Experimental Studies ◽  
Steel Corrosion ◽  
Experimental Techniques ◽  
Computational Studies ◽  
Hcl Solution

Herein, the synthesis, characterization and corrosion inhibition effectiveness of two aromatic epoxy monomers (AEMs) in carbon steel corrosive dissolution in 1 M HCl solution was investigated using computational and experimental techniques.

scholarly journals Epoxy pre-polymers as new and effective materials for corrosion inhibition of carbon steel in acidic medium: Computational and experimental studies

2021 ◽  
Author(s):  
Omar Dagdag ◽  
Zaki Safi ◽  
Rachid Hsissou ◽  
Hamid Erramli ◽  
Mehdi El Bouchti ◽  
...  
Keyword(s):  
Carbon Steel ◽  
Corrosion Inhibition ◽  
Acidic Medium ◽  
Density Functional ◽  
Experimental Studies ◽  
Steel Corrosion ◽  
Attenuated Total Reflection ◽  
Computational Techniques ◽  
Functional Theory ◽  
Different Temperatures

Present study is designed for the synthesis, characterization and corrosion inhibition behavior of two diamine aromatic epoxy pre-polymers (DAEPs) namely, N1,N1,N2,N2-tetrakis (oxiran-2-ylmethyl) benzene-1,2-diamine (DAEP1) and 4-methyl-N1,N1,N2,N2-tetrakis (oxiran-2-ylmethyl) benzene-1,2-diamine (DAEP2) for carbon steel corrosion in acidic medium. Synthesized DAEPs were characterized using spectral (Nuclear magnetic resonance (1H NMR) and Fourier transform infrared-attenuated total reflection (FTIR-ATR)) techniques. Viscosity studies carried out at four different temperatures (20–80 °C) increase in temperature causes significant reduction in their viscosities. The anticorrosive properties of DAEPs differing in the nature of substituents, for carbon steel corrosion in 1 M HCl solution was evaluated using several experimental and computational techniques. Both experimental and computational studies showed that inhibitor (DAEP2) that contains electron releasing methyl (-CH3) showed higher protectiveness as compared to the inhibitor (DAEP1) without substituent (-H). Electrochemical results demonstrate that DAEPs act as reasonably good inhibitors for carbon steel in 1 M HCl medium and their effectiveness followed the sequence: DAEP2 (92.9%) > DAEP1 (91.7%). The PDP results show that the diamine aromatic epoxy pre-polymers molecules (DAEPs) act as mixed type inhibitors. Electrochemical study was also supported using scanning electron microscopy (SEM) method were significant improvement in the surface morphology of inhibited (by DAEPs) metallic specimens was obtained. Results derived from computational density functional theory (DFT) and molecular dynamics (MD) simulationsand studies were consistent with the experimental results derived from SEM, EIS and PDP electrochemical studies. Adsorption of the DAEPs obeyed the Langmuir adsorption isotherm model.

scholarly journals Experimental and surface morphological studies of corrosion inhibition on carbon steel in HCl solution using some new hydrazide derivatives

RSC Advances ◽  
2021 ◽  
Vol 11 (22) ◽  
pp. 13497-13512
Author(s):  
Abd El-Aziz S. Fouda ◽  
Samir A. Abd El-Maksoud ◽  
Elsherbiny H. El-Sayed ◽  
Hazem A. Elbaz ◽  
Ashraf S. Abousalem
Keyword(s):  
Carbon Steel ◽  
Hydrochloric Acid ◽  
Corrosion Inhibition ◽  
Inhibition Efficiency ◽  
Steel Corrosion ◽  
Inhibitory Effect ◽  
Inhibition Mechanism ◽  
Morphological Studies ◽  
Hcl Solution

The inhibitory effect of three newly synthesized hydrazide derivatives on carbon steel corrosion in hydrochloric acid showed better inhibition efficiency (97.5%) and their inhibition mechanism is presented.

Synergistic inhibition of carbon steel corrosion in 0.5 M HCl solution by indigo carmine and some cationic organic compounds: experimental and theoretical studies

RSC Advances ◽  
2016 ◽  
Vol 6 (27) ◽  
pp. 22250-22268 ◽  
Author(s):  
Z. Zhang ◽  
N. C. Tian ◽  
X. D. Huang ◽  
W. Shang ◽  
L. Wu
Keyword(s):  
Carbon Steel ◽  
Organic Compounds ◽  
Corrosion Inhibition ◽  
Indigo Carmine ◽  
Steel Corrosion ◽  
Theoretical Studies ◽  
Inhibition Effect ◽  
Synergistic Inhibition ◽  
Experimental And Theoretical Studies ◽  
Hcl Solution

The synergistic corrosion inhibition effect of indigo carmine and three kinds of cationic organic compounds on 1045 carbon steel (CS) in 0.5 M HCl solution is reported.

Towards a theoretical understanding of alkaloid-extract Cytisine derivatives of Retama monosperma (L.) Boiss. Seeds, as eco-friendly inhibitor for carbon steel corrosion in acidic 1M HCl solution

2020 ◽  
Vol 19 (05) ◽  
pp. 2050013
Author(s):  
K. Sadik ◽  
N. El Hamdani ◽  
M. E. Hachim ◽  
S. Byadi ◽  
I. Bahadur ◽  
...  
Keyword(s):  
Carbon Steel ◽  
Density Functional ◽  
Steel Surface ◽  
Acidic Solution ◽  
Steel Corrosion ◽  
Protonation Site ◽  
Theoretical Understanding ◽  
Aqueous Acidic Solution ◽  
Retama Monosperma ◽  
Hcl Solution

Because of their availability, lower cost, biodegradability, respect for health, environmental standards and their extremely high efficiency [Benmessaoud Left D, Zertoubi M, Irhzo A, Azzi M, Revue: Huiles et extraits de plantes comme inhibiteurs de corrosion pour différents métaux et alliages dans le milieu acide chlorhydrique, J Mater Environ Sci 4:855–866, 2013], the green corrosion inhibitors are currently the most sought after candidates. The ultimate aim of this work is to study the selectivity and reactivity of a series of three molecules, namely Cytisine, Dehydro-Cytisine and N-methyl Cytisine which are the major constituents of Retama monosperma seeds alkaloid extract (AERS) as eco-friendly inhibitors of corrosion of carbon steel in acidic medium HCl (1M), using the density functional theory (DFT) at B3LYP/aug-cc-pvdz levels. Indeed, this alkaloid extract AERS has proven experimentally its corrosion inhibitory power for carbon steel in 1 M HCl even at lower concentration (94.42% at 400[Formula: see text]mg/L). Besides, its adsorption on the steel surface in 1 M HCl solution followed Langmuir’s isotherm [El Hamdani N, Fdil R, Tourabi M, Jama C, Bentiss F, Alkaloids extract of Retama monosperma (L.) Boiss. seeds used as novel eco-friendly inhibitor for carbon steel corrosion in 1 M HCl solution: Electrochemical and surface studies, Appl Surf Sci 357:1294–1305, 2015, doi: 10.1016/j.apsusc.2015.09.159; El Hamdani N, Contribution a la valorisation des parties aériennes de Retama Monosperma, phytochimie, activités antimicrobiennes et propriétés anticorrosives, Universite Chouaib Doukkali Faculte des sciences El jadida, 2015]. Herein, the major aim of this work is to investigate the likelihood of the carbon steel corrosion being inhibited by the protonated species in the aqueous acidic solution. For this purpose, after proving that the most favorable protonation site for protonation was N9, we have evaluated the structural, global and local reactivity descriptors, partial atomic charge in terms of Natural bond orbital (NBO) of the three protonated inhibitors at the level of N9, which are the most stable in the aqueous acidic solution. NBO analysis and the thermodynamic properties such as entropy, enthalpy, heat capacity and Gibbs free energy were also done. In conclusion, it was observed that three protonated molecules showed a high propensity to adsorb to the mild steel surface with a priority of the molecule d-CytN9H+.

Corrosion Inhibition of N,N- diethylammonium O,O′- di (p-chlorophenyl) dithiophosphate for Carbon Steel in HCL Solution

2013 ◽  
Vol 781-784 ◽  
pp. 299-303
Author(s):  
Shu Lan Cai ◽  
Kang Quan Qiao ◽  
Fa Mei Feng
Keyword(s):  
Electrochemical Impedance Spectroscopy ◽  
Carbon Steel ◽  
Corrosion Inhibition ◽  
Mixed Type ◽  
Electrochemical Impedance ◽  
Equivalent Circuit Model ◽  
Inhibition Effect ◽  
Inhibition Process ◽  
Hcl Solution ◽  
Mixed Type Inhibitor

A new corrosion inhibior N,N-diethylammonium O,O-di (p-chlorophenyl) dithiophosphate (EDPDP) has been synthesized and its inhibition effect towards the corrosion of carbon steel in 1.0 molL-1 HCl solution at 25 °C has been investigated by potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) methods. The obtained results show that EDPDP is a excellent inhibitor and the inhibition efficiencies exceed 90 %. The polarization measurements reveal that EDPDP is a mixed type inhibitor and the equivalent circuit model of the corrosion inhibition process is obtained by the analysis of EIS data.

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