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Hemapriya, V.,Prabakaran, M.,Parameswari, K.,Chitra, S.,Kim, S.H.,Chung, I.M. Korean Society of Industrial and Engineering Chemi 2016 Journal of industrial and engineering chemistry Vol.40 No.-
<P>The influence of two benzofused heterocyclic compounds, namely 2-phenylquinazolin-4(3H)-one(PQO) and 2-phenyl-4H-benzo[d]oxazin-4-one(POO) in controlling mild steel corrosion in 1 M H2SO4 solution was investigated using gravimetric and electrochemical methods. The experimental results revealed that both the inhibitors inhibit corrosion and their inhibition efficiency follows the order PQO > POO. A mixed mode of inhibition from polarization and a charge transfer mechanism from impedance study in the absence and presence of inhibitors were found. The passive film formed on the mild steel surface was characterized using SEM-EDX. Quantum chemical parameters derived using DFT performed at B3LYP/6-31G(d, p) level were used to correlate the molecular structure. (C) 2016 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.</P>
Venkatesan Hemapriya,Mayakrishnan Prabakaran,Kandasamy Parameswari,Subramaniyan Chitra,김승현,정일민 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.40 No.-
The influence of two benzofused heterocyclic compounds, namely 2-phenylquinazolin-4(3H)-one(PQO)and 2-phenyl-4H-benzo[d]oxazin-4-one(POO) in controlling mild steel corrosion in 1 M H2SO4 solutionwas investigated using gravimetric and electrochemical methods. The experimental results revealedthat both the inhibitors inhibit corrosion and their inhibition efficiency follows the order PQO > POO. Amixed mode of inhibition from polarization and a charge transfer mechanism from impedance study inthe absence and presence of inhibitors were found. The passive film formed on the mild steel surface wascharacterized using SEM-EDX. Quantum chemical parameters derived using DFT performed at B3LYP/6-31G(d, p) level were used to correlate the molecular structure.
Chung, Ill-Min,Hemapriya, Venkatesan,Ponnusamy, Kanchana,Arunadevi, Natarajan,Chitra, Subramanian,Chi, Hee-Youn,Kim, Seung-Hyun,Prabakaran, Mayakrishnan The Korean Electrochemical Society 2018 Journal of electrochemical science and technology Vol.9 No.3
The impact of methanol extract of Chaenomeles sinensis (C. sinensis) leaves on acid corrosion of low carbon steel was assessed by gravimetric and electrochemical methods. Phytochemical characterization by total phenolic content (TPC), and total flavonoids content (TFC) of the extract was performed. The TPC and TFC concentrations were identified as 193.50 and 40.55 mg/g. Efficiency increased remarkably in the presence of inhibitor and found as concentration dependent. A maximum inhibition efficiency of 93.19% was achieved using 2000 ppm of the C. sinensis inhibitor. Impedance and surface morphology analysis by SEM and AFM revealed that the anticorrosive activity results from the protective film of phytochemical components of C. sinensis extract adsorbed on the metal surface.
Prabakaran, M.,Kim, S.H.,Hemapriya, V.,Chung, I.M. Korean Society of Industrial and Engineering Chemi 2016 Journal of industrial and engineering chemistry Vol.37 No.-
<P>The total phenolic and flavonoid compounds present in Cryptostegia grandiflora leaf extract were analyzed. The results confirmed that the extract contains the Myricetin 3582.22(mu g/g) and Rutin 45.62(mu g/g) as major components. C. grandiflora extract was evaluated for its anti-corrosion property on mild steel in 1 M H2SO4. A maximum inhibition efficiency of 87.54% was achieved by using 500 ppm of the inhibitor. Polarization studies indicate that the extract acts as a mixed inhibitor. The formation of productive layer on mild steel by inhibitor was confirmed by SEM-EDS and AFM. The extract is adsorbed on the mild steel according to Temkin adsorption isotherm. (C) 2016 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.</P>
Mayakrishnan Prabakaran,정일민,김승현,Venkatesan Hemapriya 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.37 No.-
The total phenolic and flavonoid compounds present in Cryptostegia grandiflora leaf extract wereanalyzed. The results confirmed that the extract contains the Myricetin 3582.22(mg/g) and Rutin45.62(mg/g) as major components. C. grandiflora extract was evaluated for its anti-corrosion property onmild steel in 1 M H2SO4. A maximum inhibition efficiency of 87.54% was achieved by using 500 ppmof the inhibitor. Polarization studies indicate that the extract acts as a mixed inhibitor. The formation ofproductive layer on mild steel by inhibitor was confirmed by SEM-EDS and AFM. The extract is adsorbedon the mild steel according to Temkin adsorption isotherm.
<i>Aster koraiensis</i> as nontoxic corrosion inhibitor for mild steel in sulfuric acid
Prabakaran, Mayakrishnan,Kim, Seung-Hyun,Mugila, Nithiyanandham,Hemapriya, Venkatesan,Parameswari, Kandasamy,Chitra, Subramanian,Chung, Ill-Min Elsevier 2017 Journal of industrial and engineering chemistry Vol.52 No.-
<P><B>Abstract</B></P> <P>Inhibition efficiency of <I>Aster koraiensis</I> leaf extract toward corrosion of mild steel in 1M H<SUB>2</SUB>SO<SUB>4</SUB> solution was investigated using weight loss, electrochemical, FT-IR, SEM, and EDX methods The individual phenolic compounds present in <I>A. koraiensis</I> extract were identified. Maximum efficiency of 90.53% was achieved at 2000ppm of the extract. The corrosion kinetic parameters determined from the polarization curves indicated that the extract acted as a mixed-type inhibitor. Adsorption of the inhibitor on the mild steel surface obeyed the Langmuir isotherm. SEM investigations confirmed the formation of inhibition layer unto the metal surface by compounds present in the extract.</P> <P><B>Highlights</B></P> <P> <UL> <LI> <I>Aster koraiensis</I> extract is a very eco-friendly corrosion inhibitor for mild steel. </LI> <LI> Adsorption of inhibitor by mild steel in 1M H<SUB>2</SUB>SO<SUB>4</SUB> obeys Langmuir isotherm model. </LI> <LI> SEM and EDX examination confirm adsorption of inhibitor unto metal surface. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Prabakaran, Mayakrishnan,Kim, Seung-Hyun,Hemapriya, Venkatesan,Chung, Ill-Min Springer-Verlag 2016 Research on chemical intermediates Vol.42 No.4
<P>A Tragia plukenetii (T. plukenetii) plant extract for use as a low-cost and efficient corrosion inhibitor for mild steel (MS) in 1 M HCl medium has been studied using various methods involving weight loss calculation, electrochemical impedance spectroscopy, and Tafel polarization. The maximum corrosion inhibition efficiency was found to be 88 % at 500 ppm. It was found that the T. plukenetii extract's inhibition efficiency increased with the inhibitor concentration. The polarization measurement showed that the T. plukenetii plant extract acts as good mixed-type inhibitor. Thermodynamic investigations showed the change in enthalpy, entropy, and free energy. The adsorption mechanism of the extract was investigated using UV-Visible, FT-IR, Raman spectroscopy, and wide-angle X-ray diffraction studies. The inhibitor solution, investigated on the basis of the atomic absorption spectra for MS, revealed decreased dissolution of Fe in the presence of the plant extract. Surface analysis of the metal with and without the plant extract was carried out by using scanning electron microscopy and energy-dispersive X-ray spectroscopy.</P>
Prabakaran, Mayakrishnan,Kim, Seung-Hyun,Sasireka, Asokan,Hemapriya, Venkatesan,Chung, Ill-Min The Royal Society of Chemistry 2017 NEW JOURNAL OF CHEMISTRY Vol.41 No.10
<▼1><▼1><P>β-Sitosterol has an inhibiting effect on the corrosion of mild steel.</P></▼1><▼2><P>β-Sitosterol has an inhibiting effect on the corrosion of mild steel. We investigated this effect in a H2SO4 solution using β-sitosterol-3-O-β-d-glucoside (β-sitosterol) isolated from rice hulls. Proton nuclear magnetic resonance, UV-visible spectroscopy, FT-IR spectroscopy, weight loss measurements, electrochemical studies, and atomic absorption spectroscopy were used to examine the inhibition of β-sitosterol on mild steel corrosion in a 1 M H2SO4 solution. The effect of temperature on the corrosion behavior of mild steel was examined in the range of 303–333 ± 1 K. The inhibition efficiency increased with increasing inhibitor concentration and decreased with increasing temperature. Electrochemical studies indicated that isolated β-sitosterol acted as a good corrosion inhibitor. The surface morphologies of the mild steel specimens were analyzed by scanning electron microscopy. The maximum inhibition efficiency of β-sitosterol (500 ppm) was 95%. The surface morphology was identified using scanning electron microscopy/energy-dispersive X-ray spectroscopy (SEM-EDS), and atomic force microscopy (AFM).</P></▼2></▼1>
Basha Nusrath Unnisa, Chan,Nirmala Devi, Gowraraju,Hemapriya, Venkatesan,Chitra, Subramanian,Chung, Ill-Min,Kim, Seung-Hyun,Prabakaran, Mayakrishnan Elsevier 2018 Construction & building materials Vol.165 No.-
<P><B>Abstract</B></P> <P>As a motto of framing the strategies to minimise the deterioration in steel reinforced concrete structures as well as the fact that the work carried out with polymers are rare and scanty, polyesters namely Poly (Glycerol azealate) (PGAZ) and 4-(1-(4-methoxy phenyl) cyclo hexyl)phenyl 9-oxodecanoate (MPOD) were synthesised and evaluated for rebar corrosion in simulated concrete pore solution (SCP) for the first time at selected concentrations of 10, 100, 1000 ppm levels with an aid of electrochemical impedance and potentiodynamic polarisation techniques. Nyquist plots favoured increased R<SUB>ct</SUB> values suggesting the formation of barrier. Tafel plots represented cathodic inhibition. The experimental datas were best fitted with Langmuir adsorption isotherm facilitating monolayer adsorption. Both the methods employed were in good agreement with each other favouring maximum inhibition efficiency of 71.81% for MPOD and minimum of 57.64% for PGAZ primarily due the difference in aromatic sites as revealed in mechanism.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Effect of polymers at minimum concentrations were evaluated. </LI> <LI> Regression co-efficient close to unity intended best fit with Langmuir adsorption. </LI> <LI> Cathodic inhibition was projected from polarisation technique. </LI> <LI> Increase in R<SUB>ct</SUB> values increased inhibition efficiency. </LI> <LI> Proposed mechanism favoured higher inhibition for aromatic than aliphatic moieties. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>