Corrosion inhibition and adsorption behavior of Murraya koenigii extract for corrosion control of aluminum in hydrochloric acid medium

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3 Citations (Scopus)

Abstract

The corrosion behavior of aluminum in the hydrochloric acid medium of pH 3 was studied using Tafel polarization and electrochemical impedance spectroscopy techniques in the presence or the absence of the Murraya koenigii (commonly known as curry) leaves extract at 303 K to 323 K. The concentration of the inhibitor used was in a range of 0.05–0.4 gL−1. The inhibition efficiency was found to increase with increasing the inhibitor concentration and decreasing temperature. Polarization data showed that the curry leaves extract (CLE) acted as anodic type of inhibitor at lower concentrations of the inhibitor and as mixed type at higher concentrations of the inhibitor. The maximal inhibition efficiency of 91.79% was obtained with the CLE at its optimum concentration of 0.4 gL−1. Adsorption of the CLE was found to obey the Langmuir adsorption isotherm and underwent both physisorption and chemisorption process. The kinetic and thermodynamic parameters were calculated and discussed in detail. The results obtained by both methods were in good agreement with each other. The protective film formed on the surface of aluminum by the adsorption of inhibitor molecules present in the CLE in the hydrochloric acid medium of pH 3 was confirmed by the scanning electron microscopy and energy-dispersive X-ray spectroscopy. So, the CLE emerged as a potential, cost-effective and eco-friendly natural inhibitor for the corrosion control of aluminum in the hydrochloric acid medium.

Original languageEnglish
Pages (from-to)475-485
Number of pages11
JournalSurface Engineering and Applied Electrochemistry
Volume53
Issue number5
DOIs
Publication statusPublished - 01-09-2017

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Hydrochloric Acid
hydrochloric acid
Hydrochloric acid
Aluminum
inhibitors
corrosion
leaves
Corrosion
aluminum
Adsorption
adsorption
Polarization
Physisorption
Protective coatings
Corrosion inhibitors
Chemisorption
Electrochemical impedance spectroscopy
Adsorption isotherms
Thermodynamics
Scanning electron microscopy

All Science Journal Classification (ASJC) codes

  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Industrial and Manufacturing Engineering

Cite this

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title = "Corrosion inhibition and adsorption behavior of Murraya koenigii extract for corrosion control of aluminum in hydrochloric acid medium",
abstract = "The corrosion behavior of aluminum in the hydrochloric acid medium of pH 3 was studied using Tafel polarization and electrochemical impedance spectroscopy techniques in the presence or the absence of the Murraya koenigii (commonly known as curry) leaves extract at 303 K to 323 K. The concentration of the inhibitor used was in a range of 0.05–0.4 gL−1. The inhibition efficiency was found to increase with increasing the inhibitor concentration and decreasing temperature. Polarization data showed that the curry leaves extract (CLE) acted as anodic type of inhibitor at lower concentrations of the inhibitor and as mixed type at higher concentrations of the inhibitor. The maximal inhibition efficiency of 91.79{\%} was obtained with the CLE at its optimum concentration of 0.4 gL−1. Adsorption of the CLE was found to obey the Langmuir adsorption isotherm and underwent both physisorption and chemisorption process. The kinetic and thermodynamic parameters were calculated and discussed in detail. The results obtained by both methods were in good agreement with each other. The protective film formed on the surface of aluminum by the adsorption of inhibitor molecules present in the CLE in the hydrochloric acid medium of pH 3 was confirmed by the scanning electron microscopy and energy-dispersive X-ray spectroscopy. So, the CLE emerged as a potential, cost-effective and eco-friendly natural inhibitor for the corrosion control of aluminum in the hydrochloric acid medium.",
author = "Pushpanjali and Rao, {Suma A.} and Padmalatha Rao",
year = "2017",
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AU - Rao, Suma A.

AU - Rao, Padmalatha

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Y1 - 2017/9/1

N2 - The corrosion behavior of aluminum in the hydrochloric acid medium of pH 3 was studied using Tafel polarization and electrochemical impedance spectroscopy techniques in the presence or the absence of the Murraya koenigii (commonly known as curry) leaves extract at 303 K to 323 K. The concentration of the inhibitor used was in a range of 0.05–0.4 gL−1. The inhibition efficiency was found to increase with increasing the inhibitor concentration and decreasing temperature. Polarization data showed that the curry leaves extract (CLE) acted as anodic type of inhibitor at lower concentrations of the inhibitor and as mixed type at higher concentrations of the inhibitor. The maximal inhibition efficiency of 91.79% was obtained with the CLE at its optimum concentration of 0.4 gL−1. Adsorption of the CLE was found to obey the Langmuir adsorption isotherm and underwent both physisorption and chemisorption process. The kinetic and thermodynamic parameters were calculated and discussed in detail. The results obtained by both methods were in good agreement with each other. The protective film formed on the surface of aluminum by the adsorption of inhibitor molecules present in the CLE in the hydrochloric acid medium of pH 3 was confirmed by the scanning electron microscopy and energy-dispersive X-ray spectroscopy. So, the CLE emerged as a potential, cost-effective and eco-friendly natural inhibitor for the corrosion control of aluminum in the hydrochloric acid medium.

AB - The corrosion behavior of aluminum in the hydrochloric acid medium of pH 3 was studied using Tafel polarization and electrochemical impedance spectroscopy techniques in the presence or the absence of the Murraya koenigii (commonly known as curry) leaves extract at 303 K to 323 K. The concentration of the inhibitor used was in a range of 0.05–0.4 gL−1. The inhibition efficiency was found to increase with increasing the inhibitor concentration and decreasing temperature. Polarization data showed that the curry leaves extract (CLE) acted as anodic type of inhibitor at lower concentrations of the inhibitor and as mixed type at higher concentrations of the inhibitor. The maximal inhibition efficiency of 91.79% was obtained with the CLE at its optimum concentration of 0.4 gL−1. Adsorption of the CLE was found to obey the Langmuir adsorption isotherm and underwent both physisorption and chemisorption process. The kinetic and thermodynamic parameters were calculated and discussed in detail. The results obtained by both methods were in good agreement with each other. The protective film formed on the surface of aluminum by the adsorption of inhibitor molecules present in the CLE in the hydrochloric acid medium of pH 3 was confirmed by the scanning electron microscopy and energy-dispersive X-ray spectroscopy. So, the CLE emerged as a potential, cost-effective and eco-friendly natural inhibitor for the corrosion control of aluminum in the hydrochloric acid medium.

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