Spilanthes acmella Leaves Extract for Corrosion Inhibition in Acid Medium

In the present study, the corrosion inhibition effect of Spilanthes acmella aqueous leaves extract (SA-LE) on mild steel was investigated in 1.0 M HCl solution at different temperature using weight loss, Tafel polarization, linear polarization resistance (LPR), and electrochemical impedance (EIS) measurements. Adsorption of inhibitor on the surface of the mild steel obeyed both Langmuir and Temkin adsorption isotherms. The thermodynamic and kinetic parameters were also calculated to determine the mechanism of corrosion inhibition. The inhibition efficiency was found to increase with an increase in the inhibitor concentration i.e., Spilanthes acmella aqueous leaves extract, however, the inhibition efficiency decreased with an increase in the temperature. The phytochemical constituents with functional groups including electronegative hetero atoms such as N, O, and S in the extract adsorbed on the metal surface are found responsible for the effective performance of the inhibitor, which was confirmed by Fourier-transform infrared spectroscopy (FT-IR) and ultraviolet–visible spectroscopic (UV-Vis) studies. Protective film formation against corrosion was confirmed by scanning electron microscopy (SEM), atomic force microscopy (AFM), and contact angle studies. The result shows that the leaves extract acts as corrosion inhibitor and is able to promote surface protection by blocking active sites on the metal.

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Anticorrosion Activity of 8-Quinoline Sulphonyl Chloride on Mild Steel in 1 M HCl Solution

Journal of Metallurgy ◽

10.1155/2016/8095206 ◽

2016 ◽

Vol 2016 ◽

pp. 1-9 ◽

Cited By ~ 4

Author(s):

R. Ganapathi Sundaram ◽

M. Sundaravadivelu

Keyword(s):

Mild Steel ◽

Surface Coverage ◽

Inhibition Efficiency ◽

Electrochemical Impedance ◽

Protective Film ◽

X Ray ◽

Langmuir Adsorption ◽

Linear Polarization Resistance ◽

Tafel Polarization ◽

Hcl Solution

An anticorrosion activity of 8-quinoline sulphonyl chloride (8-QSC) on mild steel in 1 M HCl solution was studied by weight loss (WL) method and electrochemical methods, namely, electrochemical impedance spectroscopy (EIS), Tafel polarization (TP), and linear polarization resistance (LPR). Results obtained from WL method, EIS, TP, and LPR, showed that 8-QSC is a good corrosion inhibitor for mild steel in 1 M HCl solution. The results indicated that the inhibition efficiency and extent of surface coverage were increased with increase in inhibitor concentration and decrease in the corrosion rate. This is due to the formation of protective film on the surface of mild steel. Adsorption of 8-QSC on the mild steel surface was found to obey the Langmuir adsorption isotherm. A Tafel plot indicates that the used inhibitor behaves predominantly as cathodic type. The surface morphology of the mild steel was studied by Scanning Electron Microscopy (SEM) and Energy Dispersive X-Ray (EDX) Spectroscopy techniques. All the methods give the same order of inhibition efficiencies.

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Evaluation of 2-Mercaptobenzimidazole Derivatives as Corrosion Inhibitors for Mild Steel in Hydrochloric Acid

Metals ◽

10.3390/met10030357 ◽

2020 ◽

Vol 10 (3) ◽

pp. 357 ◽

Cited By ~ 3

Author(s):

Hassane Lgaz ◽

Sheerin Masroor ◽

Maryam Chafiq ◽

Mohamed Damej ◽

Ameni Brahmia ◽

...

Keyword(s):

Mild Steel ◽

Corrosion Inhibition ◽

Inhibition Efficiency ◽

Electrochemical Impedance ◽

Electrochemical Techniques ◽

Protective Film ◽

Adsorption Model ◽

Electrochemical Tests ◽

Corrosion Inhibition Efficiency ◽

New Compounds

This research aimed to develop a better understanding of the corrosion inhibition of the mild steel in acidic medium by new organic molecules. For this purpose, two new compounds namely, 2,3-dihydrobenzo[4,5]imidazo[2,1-b]thiazole (2-BIT) and 3,4-dihydro-2H-benzo[4,5]imidazo[2,1-b]thiazole (3-BIT) were synthesized and evaluated for mild steel (MS) corrosion in HCl. Analyses were carried out using weight loss measurements, electrochemical techniques, and scanning electron microscope (SEM). The adsorption of inhibitors onto the steel surface follows the Langmuir adsorption model. Generally, results showed that the corrosion inhibition efficiency of the investigated molecules was found to increase with increased concentration of inhibitors. Electrochemical tests, i.e., electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization (PDP) techniques, showed that the addition of our investigated inhibitors decreases the dissolution of the metal and generally act as mixed-type inhibitors. In addition, the influence of temperature (from 303 to 333 K) on the corrosion inhibition was studied, and the results demonstrated that with an increase in temperature, the inhibition efficiency decrease. SEM results confirmed that the inhibition process is due to a protective film that prevents corrosion. Similarly, the results showed that the inhibitory efficiencies reach 93% at 5 × 10−3 M in the case of inhibitor 3-BIT. These results revealed that this compound could effectively control and reduce the corrosion rate of mild steel in the corrosion test solution.

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Investigation of corrosion inhibition of C38 steel in 5.5 M H3PO4 solution using Ziziphus lotus oil extract: an application model

Anti-Corrosion Methods and Materials ◽

10.1108/acmm-02-2018-1901 ◽

2019 ◽

Vol 66 (1) ◽

pp. 121-126 ◽

Cited By ~ 1

Author(s):

Walid Belmaghraoui ◽

Aimad Mazkour ◽

Hicham Harhar ◽

Mourad Harir ◽

Souad El Hajjaji

Keyword(s):

Carbon Steel ◽

Corrosion Inhibition ◽

Inhibition Efficiency ◽

Electrochemical Impedance ◽

Electric Circuit ◽

Oil Composition ◽

Content Type ◽

Tafel Polarization ◽

Chemical Content ◽

Oil Extract

Purpose This study aims to investigate the corrosion inhibition effect of extracted oil from Ziziphus lotus fruit on corrosion of C38 carbon steel in 5.5 M H3PO4 solution using potentiodynamic polarization and impedance techniques. Design/methodology/approach Oil composition was determined using gas chromatography, and the results showed that oleic and palmitic acids present approximately 84.0 per cent of its total chemical content. Electrochemical impedance spectroscopy (EIS) data were analyzed by adapting it to a well-developed electric circuit model. The inhibition efficiency of Z. lotus oil was calculated and compared using Tafel polarization and EIS. Findings Accordingly, the oil extract was found to act as an anodic type inhibitor. Furthermore, inhibition efficiency of Z. lotus oil extract increase with oil concentrations and achieve approximately 70.5 per cent at 3 g/L solution of Z. lotus oil. Originality/value The results obtained from different tested methods were in line, and the oil was able to reduce significantly the kinetics of the corrosion process of C38 carbon steel.

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The Corrosion Inhibition Performance of Polyacrylic Acid with Potassium Sodium Tartrate and Zn2+ for Corrosion Control of Mild Steel in Aqueous Solution

International Letters of Chemistry Physics and Astronomy ◽

10.18052/www.scipress.com/ilcpa.61.137 ◽

2015 ◽

Vol 61 ◽

pp. 137-148 ◽

Cited By ~ 1

Author(s):

V. Dharmalingam ◽

P. Arockia Sahayaraj ◽

A. John Amalraj ◽

R. Shobana ◽

R. Mohan

Keyword(s):

Mild Steel ◽

Corrosion Inhibition ◽

Polyacrylic Acid ◽

Potentiodynamic Polarization ◽

Electrochemical Impedance ◽

Aqueous Environment ◽

Protective Film ◽

Sodium Tartrate ◽

Potassium Sodium ◽

Potassium Sodium Tartrate

The goal of studying corrosion process is to find means of minimizing corrosion or prevent it from occurring. The use of inhibitors is one of the most popular methods for corrosion protection. A protective film has been formed on the surface of the mild steel in a neutral aqueous environment using a synergistic mixture of an eco-friendly inhibitor viz., Potassium Sodium Tartrate (SPT) along with polyacrylic acid (PAA) and Zn2+ ions. The inhibiting effect of SPT, PAA and Zn2+ ions have been investigated by gravimetric studies, Potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). The investigations revealed that SPT acts as an excellent synergist in corrosion inhibition. Optimum concentrations of all the three components of the ternary formulation are established by gravimetric studies. Potentiodynamic polarization studies inferred that this mixture functions as a cathodic inhibitor. EIS studies of the metal/solution interface indicated that the surface film is highly protective against the corrosion of mild steel. Surface characterization techniques (FTIR, SEM, AFM) are also used to ascertain the nature of the protective film. The mechanical aspect of corrosion inhibition is proposed.

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Corrosion Inhibition of Mild Steel in Acidic Media by N-[(3,4-Dimethoxyphenyl)Methyleneamino]-4-Hydroxy-Benzamide

Journal of Bio- and Tribo-Corrosion ◽

10.1007/s40735-020-00439-7 ◽

2020 ◽

Vol 7 (1) ◽

Author(s):

Kashmitha Muthamma ◽

Preethi Kumari ◽

M. Lavanya ◽

Suma A. Rao

Keyword(s):

Dft Calculations ◽

Mild Steel ◽

Corrosion Inhibition ◽

Density Functional ◽

Surface Characterization ◽

Inhibition Efficiency ◽

Electrochemical Impedance ◽

Corrosion Behaviour ◽

Low Carbon ◽

Acid Media

Abstract Mild steel (a low carbon steel) is an affordable engineering material used for many purposes in various environments including mild acidic environment with some precautions. The corrosion behaviour of mild steel (MS) in 0.5 M H2SO4 and 0.5 M HCl, in the temperature range (303–323 K) without and with the inhibitor N-[(3,4-dimethoxyphenyl) methyleneamino]-4-hydroxy-benzamide (DMHB), was investigated using Potentiodynamic polarization and Electrochemical impedance spectroscopy (EIS) techniques supplementing with surface characterization study using scanning electron microscope (SEM) and atomic force spectroscopy (AFM). Experimental observations were found to be in agreement with Density functional theory (DFT) calculations. The inhibition efficiency increases with increase in DMHB concentration and showed maximum inhibition efficiency of 86% in 0.5 M H2SO4 and 81% in 0.5 M HCl, respectively, at concentration of 3 × 10─3 M at 303 K. The inhibition efficiency of DMHB obtained relatively at its lower concentration (3 × 10─3 M) compared to other reported related compounds confirms its potential towards corrosion inhibition. The variation in the kinetic and thermodynamic parameters indicated physisorption of DMHB on MS and its mixed type inhibitive action followed Langmuir’s isotherm model. DFT calculations go along with the experimental results, signifying the potential corrosion inhibition behaviour of DMHB for MS in both the acid media.

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Mitigation of Mild Steel Corrosion in Acidic Solution Using Inhibitor

E-Journal of Chemistry ◽

10.1155/2011/894041 ◽

2011 ◽

Vol 8 (s1) ◽

pp. S53-S60 ◽

Cited By ~ 1

Author(s):

M. Vishnudevan

Keyword(s):

Mild Steel ◽

Sodium Benzoate ◽

Inhibition Efficiency ◽

Acidic Solution ◽

Electrochemical Impedance ◽

Steel Corrosion ◽

Trisodium Citrate ◽

Tafel Polarization ◽

Mild Steel Corrosion ◽

Maximum Inhibition

The inhibition efficiency of mild steel corrosion in HCl acidic solution containing various concentrations of mixed inhibitors were evaluated by conducting Tafel polarization and electrochemical impedance studies. The mixed inhibitors used in this present investigation were trisodium citrate and sodium benzoate. In this present investigation 0.01 N to 0.1 N concentrations of HCl was used at 30°C. Sodium benzoate present in the mixed inhibitive system enhanced the inhibition efficiency through chemisorptions. The maximum inhibition efficiency ( 95.4%) was obtained for the mixed inhibitive system containing 0.05 M citrate and 0.5 M benzoate in 0.1 N HCl.

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Synergistic Effect of Thiourea-Zn2+ and L-Phenylalanine on the Inhibition of Corrosion of Mild Steel in Acid Medium

Science & Technology Journal ◽

10.22232/stj.2019.07.02.09 ◽

2019 ◽

Vol 7 (2) ◽

pp. 72-77

Author(s):

M.B. Geetha ◽

◽

J. Sathish ◽

S. Rajendran ◽

◽

...

Keyword(s):

Synergistic Effect ◽

Mild Steel ◽

Acid Medium ◽

Corrosion Inhibition ◽

Metal Surface ◽

Inhibition Efficiency ◽

Protective Film ◽

Surface Smoothness ◽

Polarization Study ◽

Corrosion Inhibition Efficiency

The formulation consisting of 100 ppm Thiourea, 25 ppm Zn2+ and 250 ppm of L-Phenylalanine has 95% corrosion inhibition efficiency with a synergistic effect among Thiourea, L-Phenylalanine and Zn2+ ions. Polarization study shows that this formulation as a mixed inhibitor. FTIR spectra exposed the presence of Fe2+-Thiourea, Fe2+-L-Phenylalanine complex and Zn(OH)2 in protective film. AFM study confirmed the metal surface smoothness following engrossed in the inhibitor and the presence of formed protective film on the metal surface.

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Anti-corrosive effect of Cassia alata leaves extract on Mild steel in 1.0N Hydrochloric acid

JOURNAL OF ADVANCES IN CHEMISTRY ◽

10.24297/jac.v2i2.897 ◽

2006 ◽

Vol 2 (2) ◽

pp. 82-90

Author(s):

Petchiammal A.p ◽

P.Deepa Rani ◽

S.Seetha Laks ◽

S. Selvaraj

Keyword(s):

Mild Steel ◽

Corrosion Inhibition ◽

Inhibition Efficiency ◽

Spectroscopic Studies ◽

Protective Film ◽

Cassia Alata ◽

Langmuir Adsorption ◽

Corrosive Effect ◽

Ft Ir ◽

Corrosion Inhibition Efficiency

The inhibition effect of Cassia alata leaves extract on corrosion of mild steel in 1N HCl was investigated through mass loss measurements with various time and temperature. The observed result indicated that the corrosion inhibition efﬁciency and degree of surface coverage were increased with increase of inhibitor concentration and temperature. The thermodynamic parameters (Ea, ∆Hads, ∆Gads, ∆Sads) were evaluated for corrosion inhibition process which suggests that the adsorption is endothermic, spontaneous and chemisorptions and also the inhibitor follows Langmuir adsorption isotherm. The protective ﬁlm formed on metal surface was analyzed using spectroscopic studies viz, UV, FT-IR and EDX techniques.

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Corrosion Inhibition of Mild Steel in Acid Solution by 3,4,5-Trimethoxyphenyl-2-imidazolines

E-Journal of Chemistry ◽

10.1155/2011/439234 ◽

2011 ◽

Vol 8 (2) ◽

pp. 671-679 ◽

Cited By ~ 2

Author(s):

D. Nalini ◽

R. Rajalakshmi ◽

S. Subhashini

Keyword(s):

Mild Steel ◽

Corrosion Inhibition ◽

Mixed Mode ◽

Anodic Polarization ◽

Inhibition Efficiency ◽

Electrochemical Impedance ◽

Langmuir Adsorption Isotherm ◽

Sem Images ◽

Acid Media ◽

Langmuir Adsorption

A heterocyclic imidazoline, 3,4,5-trimethoxyphenyl-2-imidazolines (TMP2I) was tested for its corrosion inhibition in 0.5 M H2SO4and 1 M HCl using weight loss, Tafel polarisation and electrochemical impedance techniques. The results show that the inhibition efficiency increases with the increase in concentration of TMP2I and the higher efficiency of about 98% is obtained in both the acid media at 20 ppm. The adsorption of TMP2I obeys Langmuir adsorption isotherm and occurs spontaneously. Cathodic and anodic polarization curves of mild steel in the presence of different concentrations of TMP2I at 300C reveal that it is a mixed type of inhibitor. Electrochemical impedance studies reveal that the system follows mixed mode of inhibition. The surface morphology of the mild steel specimens was evaluated using SEM images

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Mild steel protection with tannic and polyaspartic acid in cooling systems

Anti-Corrosion Methods and Materials ◽

10.1108/acmm-04-2019-2105 ◽

2019 ◽

Vol 66 (5) ◽

pp. 583-594

Author(s):

Esma Sezer ◽

İpek Öztürk

Keyword(s):

Mild Steel ◽

Corrosion Inhibition ◽

Inhibition Efficiency ◽

Electrochemical Impedance ◽

Electrochemical Techniques ◽

Inhibition Mechanism ◽

Polyaspartic Acid ◽

Cooling Systems ◽

Environmental Aspect ◽

Content Type

Purpose Tannic acid (TA) is one of the green corrosion inhibitors for mild steel; its anti-corrosive performance in alkaline water on mild steel when it is used together with polyaspartic acid (PASA) still has not been investigated. The purpose of this study is to develop an effective, biodegradable and environment-friendly novel corrosion inhibitor based on TA and PASA as an alternative to the conventional inorganic inhibitors for mild steel in decarbonised water, which is common in cooling systems. Design/methodology/approach Corrosion inhibition mechanism is investigated by electrochemical techniques such as polarisation measurements and electrochemical impedance spectroscopy, and results were evaluated to determine the optimum inhibitor concentration for industrial applications. Additionally, practice-like conditions are carried out in pilot plant studies to simulate the conditions in cooling systems. Thus, the efficiencies of the inhibitors are evaluated through both weight loss and linear polarisation resistance measurements. Moreover, the corrosion product is characterised by scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM-EDX) and Fourier-transform infrared spectroscopy (FTIR) analysis. Findings TA shows high inhibition efficiency especially towards pitting corrosion for mild steel in decarbonised water. PASA addition in the cooling systems improves the inhibition efficiency of TA, and at lower concentrations of TA + PASA, it is possible to obtained better inhibition efficiency than TA alone at higher inhibitor amounts, which is essential in economic and environmental aspect. Originality/value A blended inhibitor program including TA and PASA with suggested concentrations in this work can be used as an environmental friendly treatment concept for the mild steel corrosion inhibition at cooling systems.

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