Pyrimidine-2-thione derivatives as corrosion inhibitors for mild steel in acidic environments

RSC Advances ◽  
2015 ◽  
Vol 5 (15) ◽  
pp. 11145-11162 ◽  
Author(s):  
N. Soltani ◽  
M. Behpour ◽  
E. E. Oguzie ◽  
M. Mahluji ◽  
M. A. Ghasemzadeh
Keyword(s):  
Mild Steel ◽  
Quantum Chemical Calculations ◽  
Quantum Chemical ◽  
Steel Surface ◽  
Corrosion Inhibitors ◽  
Mild Steel Surface ◽  
Acidic Environments

Quantum chemical calculations show that the area containing a S atom is a possible site for bonding with the mild steel surface.

scholarly journals Terephthalohydrazide and isophthalo- hydrazide as new corrosion inhibitors for mild steel in hydrochloric acid: Experimental and theoretical approaches

2021 ◽  
Vol 65 (1) ◽  
pp. 12-22
Author(s):  
Shaimaa B. Al-Baghdadi ◽  
Ahmed A. Al-Amiery ◽  
Tayser S. Gaaz ◽  
Abdul Amir H. Kadhum
Keyword(s):  
Mild Steel ◽  
Quantum Chemical ◽  
Steel Surface ◽  
Corrosion Inhibitors ◽  
Adsorption Mechanism ◽  
Optimum Concentration ◽  
Chemical Adsorption ◽  
Theoretical Approaches ◽  
Polar Groups ◽  
Organic Corrosion Inhibitors

Abstract Most organic corrosion inhibitors have polar groups through which the molecule can be adsorbed strongly or specifically on the metal surface. In this investigation, terephthalo- hydrazide and isophthalohydrazide were synthesized as corrosion inhibitors, and their corrosion-inhibiting properties on mild steel were evaluated in a corrosive environment by weight loss measurements. The results of corrosion experiments revealed that terephthalohydrazide and isophthalohydrazide as inhibitors controlled or reduced corrosion through adsorption mechanism and showed inhibitive efficiencies of 96.4 % and 97.2 %, respectively, at the optimum concentration of 0.5 mM. The surface morphology of the metal was evaluated by scanning electron microscopy. The terephthalohydrazide or isophthalohydrazide molecules were adsorbed on the mild steel surface, and the process of adsorption follows chemical adsorption. Quantum chemical calculations of the tested corrosion inhibitors were consistent with the experimental observations.

Experimental and DFT studies of 1-methylimidazolium trinitrophenoxide as modifier for corrosion inhibition of SDS for mild steel in hydrochloric acid

2018 ◽  
Vol 65 (1) ◽  
pp. 107-122 ◽  
Author(s):  
Ali Yousefi ◽  
Saeed Amir Aslanzadeh ◽  
Jafar Akbari
Keyword(s):  
Surface Tension ◽  
Ionic Liquid ◽  
Hydrochloric Acid ◽  
Mild Steel ◽  
Surface Properties ◽  
Quantum Chemical Calculations ◽  
Quantum Chemical ◽  
Steel Surface ◽  
Particle Sizes ◽  
Content Type

Purpose The purpose of this paper is to investigate the surface properties, particle sizes and corrosion inhibition performance of sodium dodecyl sulfate (SDS) in the presence of imidazolium-based ionic liquid as an additive. Up to now, different properties of alone surfactants and ionic liquids have been studied. However, few studies have been devoted to mixed ionic liquid and surfactant. The significance and novelty of this research is the investigation of 1-methylimidazolium trinitrophenoxide ([MIm][TNP]) as ionic liquid effects on SDS corrosion behavior. Design/methodology/approach The inhibition effect of [MIm][TNP], SDS and their mixtures on mild steel surface in 2 M hydrochloric acid (HCl) solution was examined by electrochemical impedance spectroscopy, potentiodynamic polarization (PDP), scanning electron microscopy (SEM), atomic force microscopy and quantum chemical calculations as well as dynamic light scattering (DLS) and surface tension measurements to discuss surface properties of studied solutions. Findings Based on the results, ionic liquid/SDS mixtures significantly indicated better inhibition properties than pure surfactant solution. PDP curves indicated that the studied compounds act as mixed-type of inhibitors. The critical micelle concentration, surface properties and particle sizes were investigated from the surface tension measurements and DLS results. Originality/value Adsorption of the inhibitors on the steel surface obeyed the Villamil adsorption model. SEM was used for surface analysis and verified the inhibition efficiency of mixed IL/SDS system. Quantum chemical calculations were performed using density functional theory, and a good relationship between experimental and theoretical data has been obtained.

Indole-3-carbaldehyde and 2-methylindole as corrosion inhibitors of mild steel during pickling

2015 ◽  
Vol 44 (5) ◽  
pp. 322-329 ◽  
Author(s):  
Shabnam Ashhari ◽  
Ali Asghar Sarabi
Keyword(s):  
Mild Steel ◽  
Quantum Chemical Calculations ◽  
Metal Surface ◽  
Quantum Chemical ◽  
Corrosion Inhibitors ◽  
Inhibition Efficiency ◽  
Electrochemical Impedance ◽  
Contact Angles ◽  
Content Type ◽  
Hcl Solution

Purpose – This paper aims to investigate the corrosion inhibition effects of indole-3-carbaldehyde and 2-methylindole on mild steel in 1 M HCl solution. Design/methodology/approach – Indole-3-carbaldehyde and 2-methylindole as corrosion inhibitors of mild steel in 1 M HCl solution were investigated by polarisation and electrochemical impedance spectroscopy (EIS). Adsorption isotherm and mechanism were calculated. Quantum chemical calculations were used to find out a correlation between electronic structure of inhibitors and inhibition efficiency. Changes in the properties of metal surface in HCl solution in the presence of inhibitors were studied by contact angle measurements. Findings – Polarisation results revealed inhibitors could reduce cathodic and anodic reactions rates on metal surface. EIS analysis showed that inhibition efficiency of indoles increases by increasing the inhibitors’ concentration; maximum inhibition efficiency was 95 and 94 per cent in solutions containing 1 mM indole-3-carbaldehyde and 2-methylindole, respectively. Inhibitors’ adsorptions on metal surface were confirmed by analysing the exposed metals’ surface through contact angles measurements. The adsorption of inhibitors was found to follow Langmuir isotherm. Quantum chemical calculations showed that a more positively charged benzene ring in the structure of two indole-based inhibitors would lead to higher adsorption to metal. Originality/value – This research was carried out to understand the effects of two different functional groups (-C=O, -CH3) with different induction effects on the indole structure and on inhibition efficiency of corrosion inhibitors with the purpose of using these components in industrial application as acid wash solutions to etch and remove rusts from metal surfaces.

Novel Schiff-base molecules as efficient corrosion inhibitors for mild steel surface in 1 M HCl medium: experimental and theoretical approach

2016 ◽  
Vol 18 (27) ◽  
pp. 17898-17911 ◽  
Author(s):  
Sourav Kr. Saha ◽  
Alokdut Dutta ◽  
Pritam Ghosh ◽  
Dipankar Sukul ◽  
Priyabrata Banerjee
Keyword(s):  
Schiff Base ◽  
Mild Steel ◽  
Corrosion Inhibition ◽  
Theoretical Approach ◽  
Steel Surface ◽  
Corrosion Inhibitors ◽  
Functional Group ◽  
Mild Steel Surface ◽  
Hcl Medium

In order to evaluate the effect ofthe functional group present in the ligand backbone towards corrosion inhibition performances, three Schiff-base molecules were synthesized and used as corrosion inhibitors on mild steel in 1 M HCl medium.

Green Schiff's bases as corrosion inhibitors for mild steel in 1 M HCl solution: experimental and theoretical approach

RSC Advances ◽  
2016 ◽  
Vol 6 (104) ◽  
pp. 102076-102087 ◽  
Author(s):  
Neeraj Kumar Gupta ◽  
M. A. Quraishi ◽  
Chandrabhan Verma ◽  
A. K. Mukherjee
Keyword(s):  
Weight Loss ◽  
Mild Steel ◽  
Quantum Chemical Calculations ◽  
Corrosion Inhibition ◽  
Schiff Bases ◽  
Theoretical Approach ◽  
Quantum Chemical ◽  
Corrosion Inhibitors ◽  
Electrochemical Studies ◽  
Hcl Solution

Three cysteine based Schiff bases were synthesized and their corrosion inhibition properties on mild steel in 1 M HCl solution were evaluated using weight loss and electrochemical studies and quantum chemical calculations.

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