5-Naphthylazo-8-hydroxyquinoline (5NA8HQ) as a novel corrosion inhibitor for mild steel in hydrochloric acid solution (original) (raw)

In situ synthesis, electrochemical, surface morphological, UV–visible, DFT and Monte Carlo simulations of novel 5-substituted-8-hydroxyquinoline for corrosion protection of carbon steel in a hydrochloric acid solution

Journal of Molecular Liquids, 2019

Two new organic compounds based on 8-hydroxyquinoline have been successfully synthesized, and characterized by FT-IR, 1H, 13 C NMR and Elemental analysis. The synthesized compounds namely tert-butyl((8hydroxyquinolin-5-yl)-methyl)-carbamate (BHQC) and Ethyl 3-(((8-hydroxyquinolin-5-yl)-methyl)-amino)-3-oxopropanoate (EHQP) are evaluated as corrosion inhibitors for carbon steel (CS) in 1 M HCl solution using electrochemical techniques, UV − visible and SEM at 298 K. Electrochemical measurements showed that these organic compounds are mixed type inhibitors. The adsorption of both inhibitors on the carbon steel surface followed Langmuir adsorption isotherm. Furthermore, DFT calculations and Monte Carlo simulation were performed to theoretically establish the relationship between molecular structure and inhibition efficiency.

Electrochemical and theoretical studies of adsorption and corrosion inhibition of ethyl 5-amino-1-( ( 8-hydroxyquinolin-5-yl ) methyl )-1 H-1 , 2 , 3-triazole-4-carboxylate on carbon steel in acidic solution

2017

The new derivative of 1, 2,3-triazole in basic 8-hydroxyquinoline namely ethyl 4-amino-1-((8-hydroxyquinolin-5-yl)methyl)-1H-1,2,3-triazole-5-carboxylate (EHTC) was synthesized and characterized by NMR spectroscopic. This compound was tested as corrosion inhibitor for carbon steel in a 1.0 M HCl solution using Gravimetric, potentiodynamic polarization curves and electrochemical impedance spectroscopy. Potentiodynamic polarization curves measurements showed that the investigated compound acts as mixte-type inhibitor. Its inhibition efficiency improved with concentration and reached a maximum 91 % at 10-3 M. In addition, the temperature effect on the in the inhibition efficiency of EHTC was also studied in the temperature range of 298-328 K. It is found that the inhibition efficiency decreases with temperature. Indeed, the adsorption of the studied inhibitor on the mild steel was well described by the Langmuir isotherm and the calculated ΔG * ads value showed that corrosion inhibition was controlled by a chemisorptions process. Quantum chemical calculations were used to correlate the inhibition ability of EHTC with its electronic structural parameters.

Corrosion Inhibition Effect of 5-Azidomethyl-8-Hydroxyquinoline on AISI 321 Stainless Steel in Phosphoric Acid Solution

International Journal of Electrochemical Science

In the present paper, 5-Azidomethyl-8-hydroxyquinoline (AMHQ), a synthesized molecule, has been evaluated as a corrosion inhibitor for AISI 321 stainless steel in 5.5 M phosphoric acid solution, using chemical and electrochemical methods such as, hydrogen gas evolution, potentiostatic tests, potentiodynamic polarization, and impedance measurements (EIS). The obtained results show that the inhibition ability is enhanced with increasing concentrations of AMHQ and decreased with temperature. Potentiodynamic polarization curves showed that the AMHQ was acting as a mixed type inhibitor, by adsorption on both anodic and cathodic sites of Alloy 321. EIS measurements revealed that the dissolution of Alloy 321 is controlled by a mechanism of pure activation. The AMHQ is adsorbed on Alloy 321 surface according to the Langmuir isotherm adsorption model and thermodynamic parameters of the adsorption were also determined. Functional density theory (DFT) was used to modelize the interactions between the molecular structure of AMHQ and stainless steel surface.

Inhibitive effect of chloroquine towards corrosion of mild steel in hydrochloric acid solution

Springer Netherlands, 2012

"Corrosion inhibition of mild steel (MS) by chloroquine (CQ) in 1 M HCl was investigated using weight loss, polarization, electrochemical impedance spectroscopy (EIS) and quantum chemical techniques. The inhibitor showed 99 % inhibition efficiency at concentration of 3.1 9 10-4 M. Polarization studies showed that CQ is a mixed-type inhibitor. Adsorption of inhibitor molecules on the MS surface showed Langmuir adsorption isotherm. Thermodynamic parameters led to the conclusion that adsorption is predominantly chemisorption. Quantum chemical calculations were carried out to investigate the corrosion-inhibiting property of CQ. Various parameters such as energy of the highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO), softness of molecule, Mullikan charges on various atoms and number of electrons transferred from inhibitor molecule to metal were calculated and correlated with the inhibiting property of CQ."

An experimental-coupled empirical investigation on the corrosion inhibitory action of 7-alkyl-8-Hydroxyquinolines on C35E steel in HCl electrolyte

Journal of Molecular Liquids, 2020

This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.

2-Amino-1-(4-aminophenyl)-1H-pyrrolo(2,3-b)quinoxaline-3-carbonitrile as an efficient inhibitor for the corrosion of C38 steel in hydrochloric acid solution

International Journal of Electrochemical Science, 2020

The inhibiting properties of 2-Amino-1-(4-aminophenyl)-1H-pyrrolo(2,3-b)quinoxaline-3-carbonitrile (AHPQC) were examined of C38 steel corrosion in molar hydrochloric acid using electrochemical techniques. Impedance data displayed the AHPQC inhibits C38 steel corrosion becoming the adsorbate at metal/electrolyte interfaces. Polarization study indicated that AHPQC is an anodic-cathodic inhibitor. The inhibition efficiencies of AHPQC calculated by both methods reaches 91%. The Langmuir adsorption isotherm was observed for the AHPQC adsorption and its adsorption is realized by physical adsorption; due to the protonated forms of the AHPQC molecule in acid medium. XPS technique was used to discuss the mechanism for the adsorption process of the AHPQC molecule.

Experimental and empirical assessment of two new 8-hydroxyquinoline analogs as effective corrosion inhibitor for C22E steel in 1 M HCl

Journal of Molecular Liquids, 2020

This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.

Study of Kinetics and Inhibition Efficiency by Isoquinoline-5-Carboxaldehyde for Carbon Steel Corrosion in HCl

Journal of Southwest Jiaotong University, 2020

In this paper, a study of kinetics and inhibition efficiency by isoquinoline-5-carboxaldehyde of carbon steel corrosion in hydrochloric acid is conducted. The method of weight loss and hydrogen gas evolution was used with various inhibitor concentrations ranging from 150-450 parts per million with several temperatures from 40-60°C. Our results showed that increasing inhibitor concentrations and temperature led to an increase in the inhibition efficiency; this indicates both the adsorption of a film layer on a metal surface and the efficacy of the inhibitor by the attendance of oxygen and nitrogen atoms that have an active part in the adsorption process. In this study entropy, activation, and enthalpy energy were calculated.

Study A Corrosion Inhibitor Of 1-Isoquinolinyl Phenyl Ketone For Mild Steel In Acidic Medium As Hcl Acid

Journal of physics, 2019

In this research, a study was "1-isoquinolinyl phenyl ketone" as a corrosion inhibitor with concentrations (100 ,125 150 and 200 ppm) for mild steel in acidic media as HCl acid at temperatures (25 ,35 and 45 C) by using the polarization and weight loss methods. The results showed that the inhibitor is good kind especially in high concentrations for inhibitor, where inhibition efficiency increased with increasing of inhibitor concentrations and temperatures, the inhibitor is mixed type revealed, presence nitrogen and oxygen atoms in structure of inhibitor its influential role in adsorption process and formation film layer on metal. Thus study effect inhibitor concentration on thermodynamics kinetic parameters E a , ΔH, ΔS, and ΔG ads and adsorption is chemical kind.