scholarly journals Lepidagathis alopecuroides methanol extract as corrosion inhibitor for mild steel in HCl

2021 ◽  
Vol 32 (1) ◽  
pp. 22-27
Author(s):  
Gloria I. Ndukwe ◽  
Habibat F. Chahul ◽  
Godwin Oodo
Keyword(s):  
Weight Loss ◽  
Mild Steel ◽  
Corrosion Inhibitor ◽  
Plant Extract ◽  
Linear Polarization ◽  
Steel Surface ◽  
Inhibition Efficiency ◽  
Methanol Extract ◽  
Activation Parameters ◽  
Aerial Parts

Abstract We report on the preliminary phytochemical screening of the methanolic extract of the aerial parts of Lepidagathis alopecuroides and its evaluation as a potential corrosion inhibitor for mild steel in aerated 1.0 M HCl by weight loss and linear polarization measurements. Weight loss measurements were conducted at 303, 313, 323 and 333 K. The results showed that L. alopecuroides inhibited the corrosion of mild steel in the acid solution with inhibition efficiency increasing with increase in the concentrations of the plant extract but decreased with increase in temperature. Linear polarization plots showed the plant extract to inhibit both the dissolution of the steel at the anode and the hydrogen evolution reaction (HER) at the cathode making it a mixed inhibitor. Temkin adsorption isotherms best modeled the adsorption of L. alopecuroides extract on the steel surface. From the values of the evaluated kinetic activation parameters in the study, the mechanism of physisorption is proposed for the adsorption of the plant extract on the steel surface.

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.

Neem Leaf Extract as a Corrosion Inhibitor on Mild Steel in Acidic Solution

2018 ◽  
Vol 35 ◽  
pp. 208-220 ◽  
Author(s):  
Akindele Okewale ◽  
Felix Omoruwuo
Keyword(s):  
Weight Loss ◽  
Mild Steel ◽  
Corrosion Inhibitor ◽  
Leaf Extract ◽  
Steel Surface ◽  
Adsorption Mechanism ◽  
Mild Steel Surface ◽  
Freundlich Isotherms ◽  
Weight Loss Method ◽  
Neem Leaf Extract

The influence of neem leaf extract on corrosion inhibition of mild steel in 0.1 M HCl solution was studied using the weight loss method. Neem leaf extract which contains the double bond, carbonyl groups, and aromatic rings functional group as shown by the GCMS, phytochemical test, and FTIR analyses is one of the good natural plant extract that can be used as corrosion inhibitor. The weight loss on surface of mild steel at various inhibitor concentrations was determined. The highest inhibition efficiency of 93.24% was achieved using the neem leaf extract as corrosion inhibitor. Adsorption mechanism was investigated using Langmuir, Temkin, and Freundlich isotherms. Inhibitor adherence on the mild steel surface was spontaneous with the negative Gibb’s free energy value obtained. The mixed type adsorption mechanism (physisorption and chemisorption) is proposed for the inhibitor adsorption on mild steel surface. The inhibitor was adsorbed on the mild steel surface through adsorption of the phytochemical components on the surface of mild steel which protects the metal surface from corroding. The corrosion rate decreases from 0.001 to 0.0002MPY with increase in inhibitor concentrations and exposure time.

Musa Sapientum (Banana) Peels as Green Corrosion Inhibitor for Mild Steel

2019 ◽  
Vol 797 ◽  
pp. 230-239 ◽  
Author(s):  
Nor Roslina Rosli ◽  
Suriatie Mat Yusuf ◽  
Arina Sauki ◽  
Wan Muhamad Razlan Wan Razali
Keyword(s):  
Weight Loss ◽  
Mild Steel ◽  
Corrosion Inhibition ◽  
Steel Surface ◽  
Inhibition Efficiency ◽  
Steel Corrosion ◽  
Gas Chromatography Mass Spectrometry ◽  
Banana Peel ◽  
Musa Sapientum ◽  
Peel Extract

The inhibition efficiency of Musa sapientum (banana) peel extracts at different concentrations and temperatures on mild steel corrosion in acidic solution of 1 M hydrochloric acid (HCl) were investigated by using weight loss method. The banana peel extract concentrations were tested from 300 to 500 ppm at temperature range between 25°C to 60°C. The performance of banana peel extract as an inhibitor was found compatible in the tested solution. The corrosion rates, which were calculated from the weight loss data, showed that the inhibition efficiency of the extract increased from 86.9% to 89.0% as the concentration of banana peel extract increased from 300 ppm to 500 ppm. It was also observed that the inhibition efficiency decreased as the temperature was increased from 25°C to 60°C. Characterization of the peel extract by using gas chromatography-mass spectrometry (GC-MS) has detected the presence of bioactive compounds which are responsible for the corrosion inhibition and adsorption properties on mild steel surface. Eleven major compounds have been identified as having corrosion inhibition properties. FTIR analysis confirmed the presence of functional groups of alcohols, alkanes, carbonyls, aromatics, ethers, and esters that can prevent corrosion by adsorption on steel surface.

scholarly journals Corrosion Inhibition of Bark Extract of Euphorbia royleana on Mild Steel in 1M HCl

2019 ◽  
Vol 40 ◽  
pp. 25-29
Author(s):  
Bishal Thapa ◽  
Dipak Kumar Gupta ◽  
Amar Prasad Yadav
Keyword(s):  
Weight Loss ◽  
Mild Steel ◽  
Corrosion Inhibitor ◽  
Inhibition Efficiency ◽  
Bark Extract ◽  
Potential Measurement ◽  
Maximum Inhibition ◽  
Weight Loss Method ◽  
Loss Method ◽  
Loss Experiment

The bark extract of Euphorbia royleana as a green corrosion inhibitor was studied in 1M HCl using weight-loss method and potential measurement. The results show that the bark extract of Euphorbia royleana is an effective anti-corrosion inhibitor of mild steel in acidic media. The corrosion rate decreases with the time of immersion. Weight loss experiment shows that the loss in weight decreases with the time of immersion and inhibition efficiency increases with the concentration of extract. It was observed that maximum inhibition efficiency is 99.60% in 100% concentration of extract. Potential measurement study shows that bark extracts act as a mixed type of inhibitor i.e. inhibits both anodically as well as cathodically. 

scholarly journals Investigation ofCitrus aurantiifoliaLeaves Extract as Corrosion Inhibitor for Mild Steel in 1 M HCL

2009 ◽  
Vol 6 (3) ◽  
pp. 785-795 ◽  
Author(s):  
R. Saratha ◽  
S. V. Priya ◽  
P. Thilagavathy
Keyword(s):  
Mild Steel ◽  
Plant Extract ◽  
Mixed Type ◽  
Steel Surface ◽  
Inhibition Efficiency ◽  
Stable Complex ◽  
Electrochemical Studies ◽  
Inhibitive Action ◽  
Citrus Aurantiifolia ◽  
Mixed Type Inhibitor

The inhibition efficiency of acid extract of leaves ofCitrus aurantiifolia[CAL] plant on the corrosion of mild steel in 1 M HCl was investigated by weight loss measurements and electrochemical studies. The corrosion rate of mild steel and the inhibition efficiencies of the extract were calculated. The results obtained show that the extract could serve as an effective inhibitor for the corrosion of mild steel in HCl media. Inhibition was found to increase with increasing concentration of the plant extract. The inhibitive action of plant extract is discussed on the basis of adsorption of stable complex at the mild steel surface. Theoretical fitting of different isotherms, Langmuir, Temkin, Freundlich, Frumkin, Flory-Huggins and the kinetic thermodynamic model, were tested to clarify the nature of adsorption. Polarisation curves revealed that this inhibitor act as a mixed type inhibitor and the inhibition efficiency of up to 97.91% can be obtained. The surface analysis study confirms the corrosion of mild steel and its inhibition by the inhibitor CAL.

scholarly journals The Inhibitive Effect of Gnetum africanum, Gongronema latifolium and Chromolena odaratum Extracts on Corrosion of Stainless Steel in 1 M HCl and H2SO4 Solutions

2016 ◽  
Vol 66 ◽  
pp. 25-37
Author(s):  
Osita Obiukwu ◽  
Ignatius Opara ◽  
Chukwuemeka Asoluka
Keyword(s):  
Weight Loss ◽  
Stainless Steel ◽  
Corrosion Rate ◽  
Corrosion Inhibitor ◽  
Plant Extract ◽  
Inhibition Efficiency ◽  
Gongronema Latifolium

Extract of various plants; Okazi leaf (Gnetum africanum), Utazi leaf (Gongronema latifolium) and Elizabeth leaf (Chromolena odaratum) was investigated as corrosion inhibitor of stainless steel in 1M HCL and H2SO4 using conventional weight loss. Results were obtained at intervals of 24, 48, 72 and 96 hours respectively. The corrosion rate and inhibition efficiency were calculated. The results revealed that all the plant extract act as inhibitors in the acid environments while Elizabeth leaf (Chromolena odaratum) proved to be better corrosion inhibitor than Okazi plant (Gnetumafricanum) and Utazi plant (Gongronemalatifolium) extract as it recorded the highest inhibition efficiency of 90.95% in 1M HCL for 20 ml concentration.

Experimental and theoretical studies of hydralazine hydrochloride as corrosion inhibitor for mild steel in HCl acid medium

2015 ◽  
Vol 63 (1) ◽  
pp. 47-55 ◽  
Author(s):  
B.M. Prasanna ◽  
B.M. Praveen ◽  
Narayana Hebbar ◽  
T.V. Venkatesha
Keyword(s):  
Weight Loss ◽  
Adsorption Isotherm ◽  
Mild Steel ◽  
Corrosion Inhibitor ◽  
Active Sites ◽  
Inhibition Efficiency ◽  
Content Type ◽  
Inhibition Effect ◽  
Different Temperatures ◽  
Hydralazine Hydrochloride

Purpose – The purpose of this paper is to investigate the inhibition effect of hydralazine hydrochloride as a corrosion inhibitor for mild steel in 1M HCl. The inhibition effect was studied at different temperatures, ranging from 303 to 333°K. Design/methodology/approach – The inhibition efficiency of hydralazine hydrochloride was analyzed using weight loss, Tafel polarization, electrochemical impedance spectroscopy and surface morphology methods. The effect of temperature on the corrosion behavior of mild steel in 1M HCl was studied and discussed using an adsorption isotherm and activation parameters. Findings – Weight loss, polarization and impedance showed that the inhibition efficiency increases with an increase in the concentration of hydralazine hydrochloride for mild steel in 1M HCl. The inhibitive action may be attributed to the adsorption of the inhibitor molecule on the active sites of the metal surface by the Langmuir adsorption isotherm. Polarization curves indicated that hydralazine hydrochloride acts as a mixed-type inhibitor. Scanning electron microscopy was performed on inhibited and uninhibited mild steel samples to characterize the surface. Thermodynamic parameter indicated that the adsorption of hydralazine hydrochloride is a spontaneous process and the adsorption occurs chemically. Originality/value – The inhibition effect of hydralazine hydrochloride for mild steel has been investigated at different temperatures, ranging from 303 to 333°K. Hydralazine hydrochloride was a good inhibitor at a higher temperature.

scholarly journals Effect of N-(6-aminobenzo[d]thiazol-2-yl)benzamide and 2,6-diamino-benzothiazole as Corrosion Inhibitor in acid medium

2016 ◽  
Vol 12 (12) ◽  
pp. 4593-4613
Author(s):  
Rekha. S ◽  
Kannan. K ◽  
Gnanavel. S
Keyword(s):  
Weight Loss ◽  
Mild Steel ◽  
Corrosion Inhibitor ◽  
Acid Medium ◽  
Potentiodynamic Polarization ◽  
Inhibition Efficiency ◽  
Free Energy Of Adsorption ◽  
Weight Loss Method ◽  
Ft Ir ◽  
Loss Method

2-amino-6-nitrobenzothiazole(ANBT) was used as an inhibitor for the corrosion of mild steel in acid medium since the inhibition efficiency was low for that compound, 2,6-diaminobenzothiazole (DABT) and N-(6-aminobenzo [d] thiazol-2-y1) benzamide(ABTB) was synthesized,  and characterized by FT-IR, H1NMR, and C13NMR.The synthesized compound was tested as a corrosion inhibitor for mild steel in 1N HCl solution using weight loss, Potentiodynamic polarization, and AC impedance techniques. The inhibition efficiency was studied at the different time, temperature and acid concentration by weight loss method. The values of activation energy and free energy of adsorption of these compounds were also calculated, which reveals that the inhibitor was adsorbed on the mild steel by physisorption mechanism. Adsorption obeys Langmuir and Temkin adsorption isotherms. The results obtained by weight loss method revealed that the compound performed as a better inhibitor for mild steel in 1N HCl. Potentiodynamic polarization studies showed that the inhibitor acts as a mixed type inhibitor.AC impedance studies revealed that the corrosion process was controlled by charge transfer process. Surface analysis was studied using SEM and FT-IR.

The Action Mechanisms of BIMGCS12-3 as Corrosion Inhibitor of Mild Steel for Vitriolic Acid Pickling

2011 ◽  
Vol 337 ◽  
pp. 785-788
Author(s):  
Yong Ming Sun
Keyword(s):  
Weight Loss ◽  
Mild Steel ◽  
Corrosion Inhibitor ◽  
Mixed Type ◽  
Steel Surface ◽  
Ammonium Bromide ◽  
Morphological Examination ◽  
Acid Pickling ◽  
Action Mechanisms ◽  
Mixed Type Inhibitor

Propanediyl-α, ω-bis-(N-dodecyl benzimidazole ammonium bromide), (abbreviated as BIMGCS12-3), was tested as inhibitor for the corrosion of mild steel in 1M H2SO4. It was found by weight loss technique that prepared inhibitor adsorbed on mild steel surface forming a protecting film. Polarization curves show that BIMGCS12-3 acts as mixed type inhibitor. Moreover, surface morphological examination has been carried out by SEM.

scholarly journals Synergistic effect on inhibiton efficiency of coconut husk fibre essence in controlling corrosion of mild steel in neutral medium

2015 ◽  
Vol 49 (3) ◽  
pp. 185-188
Author(s):  
A Sankar ◽  
S Ananth Kumar ◽  
S Rameshkumar
Keyword(s):  
Weight Loss ◽  
Mild Steel ◽  
Steel Surface ◽  
Inhibition Efficiency ◽  
Electrochemical Impedance ◽  
Neutral Medium ◽  
Well Water ◽  
Inhibitor Concentration ◽  
Coconut Husk ◽  
Tank Water

The corrosion inhibition nature of coconut husk essence for the corrosion of mild steel in tank water (neutral medium) was investigated using weight loss, electrochemical impedance and Potentiodynamic Polarization methods. The results revealed that coconut husk essence acts as a corrosion inhibitor in well water. The inhibition efficiency increased with an increase in inhibitor concentration. The inhibition is attributed to adsorption of the inhibitor on the steel surface. DOI: http://dx.doi.org/10.3329/bjsir.v49i3.22133 Bangladesh J. Sci. Ind. Res. 49(3), 185-188, 2014

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