Corrosion inhibition property of polyester–groundnut shell biodegradable composite

Palanisamy, Subramanian; Kiruthika, A.; Saranya, J.; Parameswari, K.; Chitra, S.

doi:10.1016/j.ecoenv.2015.08.014

Cited by 8 publications

(3 citation statements)

References 18 publications

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“…A traditional three-electrode cell assembly was utilized with the auxiliary electrode as platinum foil, saturated calomel electrode as reference and working electrode (mild steel specimen). Charge transfer resistance (R ct ) and double-layer capacitance (C dl ) from the impedance graphs were determined 15,16 . Polarisation measurement was conducted in the range of -200 mV to +200 mV to get a smooth polarisation curve and scan rate was fixed to 1mV/sec.…”

Section: Electrochemical Techniquesmentioning

confidence: 99%

CORROSION RESISTANCE OF Cissus quadrangularis EXTRACTS ON METAL IN AGGRESSIVE MEDIUM: GRAVIMETRIC AND SURFACE EXAMINATIONS

Anitha¹,

Chitra²

2019

RJC

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The corrosion resistance of Cissus quadrangularis in acid and ethanol medium have been investigated by diverse techniques. It has been noticed that as the concentration (2 to 12v/v %) of C. quadrangularis rises the efficiency of the inhibitor also increases. The maximum inhibition efficiencies of 89.45 % and 75.54 % were attained for acid and ethanol extracts respectively. The emergence of a protective layer on the mild steel surface was assessed by electrochemical impedance studies. The influence of the active ingredients in the extracts was examined by GC-MS analysis. The inhibitor adsorption ensued in the protective layer on the surface was analyzed using SEM and AFM.

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Section: Electrochemical Techniquesmentioning

confidence: 99%

CORROSION RESISTANCE OF Cissus quadrangularis EXTRACTS ON METAL IN AGGRESSIVE MEDIUM: GRAVIMETRIC AND SURFACE EXAMINATIONS

Anitha¹,

Chitra²

2019

RJC

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“…is the equilibrium constant of the adsorption process. The K value is related to the Gibbs free energy of adsorption, ΔG°a ds , according to the following equation (45) : K ads = (1/ 55.5) exp -∆G o ads / RT ……. (4) where 55.5 is the molar concentration of water in the bulk solution in mol L -1 , R is the universal gas constant and T is the absolute temperature.As shown in Fig.6 the plot of C/Ɵversus C for metal in the corrosive medium with different inhibitor concentrations, yields a straight line showing that the adsorption of the inhibitor is well described by the Langmuir isotherm.…”

Section: Adsorption Isothermsmentioning

confidence: 99%

Citrullus collocynthis Extract as Corrosion inhibitor for carbon low steel in Acid Medium using Weight Loss Method

2019

University of Thi-Qar Journal of Science

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corrosion inhibition of carbon low steel using methanol extract of the fruits of Citrullus collocynthis was studied using weight loss measurement at 303,323 and 333ºK. The inhibition efficiency increased with the increase in inhibitor concentration but decreased with temperature. The Langmuir adsorption isotherm was tested for their fit to the experimental data. The apparent activation energies ,entropies of the dissolution process and the free energies for the adsorption process were determined an discussed .All computed quantum chemical parameters are found to correlate well with experimental inhibition efficiency of inhibitor.

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“…The green inhibitors play a vital role in shielding the metal from corrosion because they are not only a rich source of naturally synthesized chemical compounds but they are eco-friendly in nature and can be prepared by simple methods at low cost. Hetero atoms such as S, N and O in plant extracts act as active centers for adsorption because of the availability of lone pair of electrons, thus forming a protective film on the surface of the metal, blocking an active surface site and minimizing the rate of corrosion (Sounthari et al , 2016). Inhibitors support the metal by maintaining a resistance against corrosion through various inhibition mechanisms.…”

Section: Introductionmentioning

confidence: 99%

Anti-corrosive potential ofCyperus rotundusas a viable corrosion inhibitor for mild steel in sulphuric acid

Anitha¹,

Unnisa²,

Hemapriya³

et al. 2020

PRT

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Purpose Over the past decade, plant extracts are ultimate green candidatures to substitute the expensive and noxious synthetic corrosion inhibitors. In this regard, this study aims to focus on evaluating anti-corrosion properties of green inhibitor Cyperus rotundus (C. rotundus), a perennial herb found throughout India. Design/methodology/approach The biocompatible components present in C. rotundus extract was analyzed by gas chromatography–mass spectroscopy analysis. The corrosion inhibitory effect of C. rotundus was assessed by impedance, polarization and surface morphometric study [atomic force microscopy (AFM)]. Density functional theory (DFT) study was carried using DFT/B3LYP, and basis set used for calculations was 6-31G (d, p) using Gaussian 03 program package. Findings Predominant components such as octadecanoicacid, ethylester, n-hexadecanoic acid, pentanoicacid-4-oxoethyl ester, cyclotrisiloxane, hexamethyl, cyclotetrasiloxane and octamethyl were identified from the extract of C. rotundus. Impedance study demonstrated that the addition of inhibitor reduces the double-layer capacitance and increases the charge transfer resistance. Furthermore, polarization studies indicated that the extract of C. rotundus acted as a mixed-type inhibitor with decrease in corrosion current density with increase in concentration. AFM study evinced the formation of inhibitor film on mild steel surface. The donor–acceptor interactions of active sites of predominant phytoconstituents were substantiated by computational analysis (DFT). Originality/value This paper deals with the inhibition effect of extract of C. rotundus on mild steel in 0.5M H2SO4. C. rotundus has a capability to adsorb on the metal surface, thus hindering corrosion.

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Corrosion inhibition property of polyester–groundnut shell biodegradable composite

Cited by 8 publications

References 18 publications

CORROSION RESISTANCE OF Cissus quadrangularis EXTRACTS ON METAL IN AGGRESSIVE MEDIUM: GRAVIMETRIC AND SURFACE EXAMINATIONS

CORROSION RESISTANCE OF Cissus quadrangularis EXTRACTS ON METAL IN AGGRESSIVE MEDIUM: GRAVIMETRIC AND SURFACE EXAMINATIONS

Citrullus collocynthis Extract as Corrosion inhibitor for carbon low steel in Acid Medium using Weight Loss Method

Anti-corrosive potential ofCyperus rotundusas a viable corrosion inhibitor for mild steel in sulphuric acid

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