scholarly journals Effect of Serine and Methionine on Electrochemical Behavior of the Corrosion of Mild Steel in Aqueous Solutions

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
Mohamed N. Rahuma ◽  
Mohamed B. EL-Sabbah ◽  
Imperiyka M. Hamad
Keyword(s):  
Amino Acids ◽  
Mild Steel ◽  
Pitting Corrosion ◽  
Steel Surface ◽  
Inhibition Efficiency ◽  
Corrosion Behaviour ◽  
Physical Adsorption ◽  
Corrosion Current ◽  
Positive Direction ◽  
Mild Steel Surface

The pitting corrosion behaviour of mild steel in Na2HPO4 solutions contains chloride ion as an aggressive ion and serine and methionine as inhibitors were investigated using open-circuit potential (OCP), potentiodynamic polarization measurements, and pitting corrosion current measurements; both inhibitors shift the potential in the positive direction. The corrosion rate of the mild steel was measured in the absence and presence of the inhibitors, and the inhibition efficiency of the amino acids at a concentration of 0.02 M was calculated. The pitting corrosion current shows that increasing concentration of the inhibitor causes a decrease in pitting current density, and inhibition efficiency increases with increasing concentration of the inhibitors. The adsorption of these inhibitors on the mild steel surface obeys Langmuir isotherm, and the calculated adsorption free energy (ΔGads0) for the inhibitors on the mild steel in 0.1 M (Na2HPO4 + NaCl) solutions was found to be (−24.61, −29.34) kJ/mol for serine and methionine, respectively, which reveals strong physical adsorption of the amino acids molecules on the mild steel surface.

scholarly journals Kinetics and Thermodynamics Investigations on Corrosion Inhibiting Properties of Coffee Husks Extract on Mild Steel in Acidic Medium

2020 ◽  
Vol 3 (1) ◽  
Author(s):  
Nyirimbibi Daniela Kalisa ◽  
Theonestea Muhizi ◽  
Jean Jacques Yvesa Niyotwizera ◽  
Jean Baptistea Barutwanayo ◽  
Jean Boscoa Nkuranga
Keyword(s):  
Phenolic Compounds ◽  
Mild Steel ◽  
Acidic Medium ◽  
Steel Surface ◽  
Inhibition Efficiency ◽  
Physical Adsorption ◽  
Mild Steel Surface ◽  
Ionic Dissociation ◽  
Weight Loss Method ◽  
Loss Method

In this study, the use of green corrosion inhibitors extracted from coffee husks was investigated on mild steel materials in acidic medium. Phenolic compounds from coffee husks were extracted using acetone solvent, characterised and investigated for their corrosion inhibiting properties. The FTIR and 1H-NMR technique were carried out to characterise the present phenolic compounds extracted from purified coffee husks. The corrosion inhibition efficiency of phenolic compounds from coffee husks extract on mild steel in 1.0 M HCl was evaluated by using weight loss method. The obtained results showed that corrosion rates decreased with the increase of inhibitor concentration, temperature and immersion time. The  optimum inhibition efficiency of 86.5% at 25 ºC was obtained with a concentration of 400 mg/L (400 ppm) of coffee husks extract in two hours of experiment. The observed inhibition efficiency was attributed to the physical adsorption mechanism of phenolic compounds on mild steel surface through charged ion formation from protonation of lone pairs of oxygen in phenol or ionic dissociation of carboxylic acid functional group that formed a charged layer over mild steel surface. Furthermore, it was pointed out that the adsorption process obeyed the Langmuir adsorption  isotherm model at all investigated temperatures between 25 and 40 ºC. Keywords: Corrosion inhibitor, phenolic compounds, coffee husks extract, mild steel, adsorption

Electrochemical behaviour of acetyl G as corrosion inhibitor for mild steel in acid medium

2015 ◽  
Vol 44 (6) ◽  
pp. 371-378 ◽  
Author(s):  
Y. Sangeetha ◽  
S. Meenakshi ◽  
C. Sairam Sundaram
Keyword(s):  
Mild Steel ◽  
Corrosion Inhibitor ◽  
Acid Medium ◽  
Steel Surface ◽  
Inhibition Efficiency ◽  
Electrochemical Impedance ◽  
Electrochemical Behaviour ◽  
Green Inhibitor ◽  
Content Type ◽  
Mild Steel Surface

Purpose – The purpose of this paper is to develop an eco-friendly corrosion inhibitor for mild steel in 1 M HCl. Design/methodology/approach – A pharmaceutical drug acetyl G was investigated for its corrosion inhibition efficiency using weight loss method, potentiodynamic polarisation and electrochemical impedance spectroscopy. Findings – The inhibition efficiency increased with increase in inhibitor concentration. Results from polarisation studies revealed mixed type of inhibition. Impedance studies, scanning electron microscopy and Fourier transform spectroscopy confirm the adsorption of inhibitor on the mild steel surface. Research limitations/implications – The drug acetyl G has sulphur and nitrogen atoms which effectively block the corrosion of mild steel and is non-toxic and has good inhibition efficiency. Practical implications – This method provides an excellent, non-toxic and cost-effective material as a corrosion inhibitor for mild steel in acid medium. Originality/value – Application of this drug as a corrosion inhibitor has not been reported yet in the literature. Replacing the organic inhibitors, this green inhibitor shows excellent inhibition efficiency. This is adsorbed excellently on the mild steel surface due to the presence of long chain and hetero atoms. Thus, the drug retards the corrosion reaction.

scholarly journals Experimental and theoretical study on the corrosion inhibitor potential of quinazoline derivative for mild steel in hydrochloric acid solution

2020 ◽  
Author(s):  
Fidelis Ebunta Abeng ◽  
Valentine Anadebe ◽  
Patience Yake Nkom ◽  
Enyinda Goodluck Kamalu ◽  
Kelechi J. Uwakwe
Keyword(s):  
Mild Steel ◽  
Corrosion Inhibition ◽  
Potentiodynamic Polarization ◽  
Metal Surfaces ◽  
Steel Surface ◽  
Physical Adsorption ◽  
Steel Corrosion ◽  
Quinazoline Derivative ◽  
Mild Steel Surface ◽  
Mild Steel Corrosion

Interaction of metal surfaces with organic molecules has a significant role in corrosion inhibition of metals and alloys. More clarification, from both experimental and computa­tional view is needed in describing the application of inhibitors for protection of metal surfaces. In this study, the surface adsorption and corrosion inhibition behavior of metol­azone, a quinazoline derivative, on mild steel in 0.02, 0.04, 0.06, and 0.08 M HCl solutions were investigated. Weight loss, potentiodynamic polarization and electrochemical impe­dance spectroscopy techniques were used. The optimum inhibition efficiencies of 75, 82 and 83 % were found by these three techniques at the optimum inhibitor concentration of 500 mg/L and 303 K. Scanning electron microscopy (SEM) was used to confirm adsorption of quinazoline derivative on the surface of the mild steel. Computational simulations were additionally used to give insights into the interaction between quinazoline inhibitor and mild steel surface. Thermodynamic parameters of mild steel corrosion showed that quinazoline derivative functions as an effective anti-corrosive agent that slows down corrosion process. Potentiodynamic polarization results revealed a mixed-type inhibitor, while the result of the adsorption study suggests that adsorption of the inhibitor on the mild steel surface obeys the physical adsorption mechanism and follows Langmuir adsorption isotherm model.  

scholarly journals Corrosion and Inhibitor on Material: Experimental and Computational Calculations

2020 ◽  
Vol 9 (4) ◽  
pp. 1373-1383
Keyword(s):  
Corrosion Rate ◽  
Mild Steel ◽  
Steel Surface ◽  
Adsorption Mechanism ◽  
Inhibition Efficiency ◽  
Protonated Form ◽  
Mild Steel Surface ◽  
Langmuir Adsorption ◽  
Computational Calculations ◽  
Comprehensive Study

In this paper, we provide a comprehensive study of corrosion inhibition of mild steel in 1 M HCl solution at 313, 323, and 333 K using 4,4-Dimethyl oxazolidine-2-thione (DMOT) and its protonated form (DMOTH+ ) as inhibitors. Our results show that the corrosion rate of mild steel in 1 M HCl increases as the temperature increases while it decreases as the DMOT concentration increases. In contrast to the corrosion rate, the DMOT inhibition efficiency decreases with temperature and increases with increasing DMOT concentration. Both experimental and quantum chemical computational results reveal that the adsorption of DMOT and DMOTH+ on the mild steel surface is a mixed-type process having both physisorption and chemisorption. Moreover, the inhibitor adsorption on the mild steel surface was found to obey the Langmuir adsorption isotherm and the value of Gibbs energy of adsorption at the three studied temperatures is associated with an adsorption mechanism involving both physisorption and chemisorption processes. Heavy corrosion, cavities, and pitting of surfaces were observed in the absence of DMOT inhibitor, while much less corrosion was consistently observed in the presence of DMOT inhibitor

Adsorption and Inhibitive Properties of 1-phenylaminomethyl-benzimidazole on Corrosion of Mild Steel in Hydrochloric Acid

2014 ◽  
Vol 989-994 ◽  
pp. 536-539 ◽  
Author(s):  
Tie Jun Su ◽  
Ke Hua Li
Keyword(s):  
Hydrochloric Acid ◽  
Adsorption Isotherm ◽  
Mild Steel ◽  
Corrosion Inhibition ◽  
Potentiodynamic Polarization ◽  
Steel Surface ◽  
Inhibition Efficiency ◽  
Langmuir Adsorption Isotherm ◽  
Mild Steel Surface ◽  
Langmuir Adsorption

The corrosion inhibition of mild steel in 5.0 M HCl by 1–phenylaminomethyl-benzimidazo -le (PMB) was studied by gravimetric and potentiodynamic polarization methods. Inhibition efficiency of PMB increased with increase in the concentration of inhibitor and decreased with the increase in temperature. PMB acts as anodic-type inhibitor for mild steel. The adsorption of PMB on mild steel surface obeys the Langmuir adsorption isotherm.

scholarly journals Inhibition of Mild Steel Corrosion in Acidic Medium by Telfairia occidentalis Rind Extract

2018 ◽  
pp. 1-10
Author(s):  
Inemesit A. Akpan ◽  
Okon U. Abakedi ◽  
Mfon A. James
Keyword(s):  
Mild Steel ◽  
Steel Surface ◽  
Physical Adsorption ◽  
Steel Corrosion ◽  
Sulphuric Acid Solution ◽  
Green Inhibitor ◽  
Mild Steel Surface ◽  
Langmuir Adsorption ◽  
Telfairia Occidentalis ◽  
Mild Steel Corrosion

Telfairia occidentalis rind extract has been studied as a potential green inhibitor for mild steel corrosion in 1 M H2SO4 using weight loss and hydrogen evolution methods. The results of the investigation reveal that Telfairia occidentalis rind extract is a good inhibitor of mild steel corrosion in sulphuric acid solution. The inhibition efficiency increases with increase in rind extract concentration but decreases with increase in temperature. The calculated thermodynamic parameters reveal that the corrosion inhibition process was endothermic and spontaneous. Physical adsorption has been proposed for the adsorption of Telfairia occidentalis rind extract onto mild steel surface. The adsorption of the extract on mild steel surface obeys the Langmuir adsorption isotherm. 

Corrosion resistance of mild steel in sulphuric acid solution by Coreopsis tinctoria extract: electrochemical and surface studies

2018 ◽  
Vol 65 (4) ◽  
pp. 408-416 ◽  
Author(s):  
Kathirvel Kalaiselvi ◽  
Ill-Min Chung ◽  
Seung-Hyun Kim ◽  
Mayakrishnan Prabakaran
Keyword(s):  
Mild Steel ◽  
Plant Extract ◽  
Steel Surface ◽  
Inhibition Efficiency ◽  
Sulphuric Acid Solution ◽  
Content Type ◽  
Mild Steel Surface ◽  
Coreopsis Tinctoria ◽  
Maximum Inhibition ◽  
Raman Spectral

Purpose The purpose of this paper is to investigate the inhibitive performance of Coreopsis tinctoria (C. tinctoria) plant extract for the corrosion of mild steel in 0.5 M H2SO4. Design/methodology/approach The inhibition efficiency was studied by weight loss, electrochemical measurements and the surface analysis was done by Raman, scanning electron microscopy/energy-dispersive X-ray spectroscopy (SEM-EDS) and atomic absorption spectroscopy (AAS) analysis. Findings Maximum inhibition efficiency of C. tinctoria in 0.5 M H2SO4 on mild steel is 80.62 per cent (500 ppm) at 303 ± 1K. The adsorption of the C. tinctoria on the mild steel surface in 0.5 M H2SO4 was found to obey Langmuir adsorption isotherm. Temperature studies were carried out and the significant parameters, such as change in enthalpy (ΔH°), change in entropy (ΔS°) and change in free energy (ΔG°ads) and heat of adsorption (Qads), were calculated. The productive layer formed on the mild steel surface in 0.5 M H2SO4 were confirmed by the Raman spectral analysis. Originality/value This paper provides information on the inhibitive properties of C. tinctoria plant extract which is found to be a good corrosion inhibitor for mild steel in 0.5 M H2SO4.

scholarly journals Inhibition Effect of Hydrazine-Derived Coumarin on a Mild Steel Surface in Hydrochloric acid

2020 ◽  
Vol 37 (3−4) ◽  
Author(s):  
Fanar G. Hashim ◽  
Taghried A. Salman ◽  
Shaimaa B. Al-Baghdadi ◽  
Tayser Gaaz ◽  
Ahmed Al-Amiery
Keyword(s):  
Hydrochloric Acid ◽  
Mild Steel ◽  
Density Functional ◽  
Steel Surface ◽  
Inhibition Efficiency ◽  
Protective Layer ◽  
Sem Analysis ◽  
Mild Steel Surface ◽  
Acid Environment ◽  
Increasing Temperature

In this work, economy novel hydrazine-derived coumarin 4-(6-methylcoumarin)acetohydrazide (MCA) were synthesized, characterized, and tested as an inhibitor for the corrosion of a surface of mild steel in an acidic environment through weight loss and Scanning electron microscopy (SEM) techniques. Results showed that the synthesized inhibitor can inhibit the corrosion of mild steel surface in a 1 M hydrochloric acid environment. The corrosion inhibition efficiency of MCA increases with increasing MCA concentration and decreases with increasing temperature. SEM analysis showed the formation of a film as a protective layer from MCA molecules on the surface of mild steel. Adsorption of the MCA molecules on the mild steel surface in the presence of hydrochloric acid environment was obeyed Langmuir isotherm. The density functional theory (DFT) calculations were used to study the relationship between molecular structure and inhibition efficiency and they found in good agreement.

scholarly journals Inhibition of Mild Steel Corrosion in Sulphuric Acid Using Esomeprazole and the Effect of Iodide Ion Addition

2013 ◽  
Vol 2013 ◽  
pp. 1-10 ◽  
Author(s):  
G. Karthik ◽  
M. Sundaravadivelu
Keyword(s):  
Mild Steel ◽  
Steel Surface ◽  
Inhibition Efficiency ◽  
Electrochemical Impedance ◽  
Steel Corrosion ◽  
Effect Of Temperature ◽  
Mild Steel Surface ◽  
Iodide Ions ◽  
Adsorption Processes ◽  
Pharmaceutically Active Compound

The inhibition of the corrosion of mild steel in 1 M H2SO4 solution by the pharmaceutically active compound esomeprazole (ESP) has been investigated by using weight loss, potentiodynamic polarization, and electrochemical impedance spectroscopy measurements. The effect of temperature on the corrosion behavior with the addition of different concentrations of ESP was studied in the temperature range of 30–60°C. Results obtained revealed that the inhibition efficiency increased with the increase in concentration of the inhibitor but decreased with the increase in temperature. The addition of KI increased the inhibition of ESP to a considerable extent. The experimental results suggest that the presence of iodide ions in the solution stabilized the adsorption of the ESP molecule on the mild steel surface, thereby improving the inhibition efficiency. Polarization curves indicated that the ESP belonged to a mixed-type inhibitor. Adsorption of the inhibitor on the mild steel surface is found to obey the Langmuir adsorption isotherm. Some thermodynamic functions of dissolution and adsorption processes were also determined. Surface analysis via scanning electron microscope (SEM) and atomic force microscope (AFM) shows a significant improvement in the surface morphology of the mild steel plate.

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