Electrochemical and gravimetric measurements of inhibition of aluminum corrosion by poly (methacrylic acid) in H2SO4 solution and synergistic effect of iodide ions

Moses M. Solomon; Saviour A. Umoren

doi:10.1016/j.measurement.2015.08.029

Electrochemical and gravimetric measurements of inhibition of aluminum corrosion by poly (methacrylic acid) in H₂SO₄ solution and synergistic effect of iodide ions

Moses M. Solomon, Saviour A. Umoren

Research output: Journal Publication › Article › peer-review

50 Citations (Scopus)

Abstract

The corrosion inhibition of Al in 0.5 M H₂SO₄ solution by poly (methacrylic acid) (PMAA) alone and in combination with iodide ions was studied at 303-333 K using gravimetric, electrochemical impedance spectroscopy, potentiodynamic polarization, scanning electron microscopy and water contact angle measurements techniques. Results obtained show that PMAA moderately inhibited the dissolution of Al in the corrosive medium. Addition of Iodide ions synergistically upgrades the inhibition efficiency of PMAA to a maximum value of 82.6%. From polarization results, PMAA and PMAA + KI can be classified as mixed-type corrosion inhibitor. Thermodynamic parameters namely Gibbs free energy of adsorption, activation energy and enthalpy of activation revealed that the adsorption processes of PMAA and PMAA + KI are endothermic reactions mainly by a physisorption mechanism and followed El-Awady et al. thermodynamic-kinetic adsorption isotherm.

Original language	English
Pages (from-to)	104-116
Number of pages	13
Journal	Measurement: Journal of the International Measurement Confederation
Volume	76
DOIs	https://doi.org/10.1016/j.measurement.2015.08.029
Publication status	Published - 12 Dec 2015
Externally published	Yes

Keywords

Aluminum
Corrosion
Electrochemical impedance spectroscopy
Poly (methacrylic acid)
Scanning electron microscopy
Synergism

ASJC Scopus subject areas

Instrumentation
Electrical and Electronic Engineering

Access to Document

10.1016/j.measurement.2015.08.029

Cite this

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title = "Electrochemical and gravimetric measurements of inhibition of aluminum corrosion by poly (methacrylic acid) in H2SO4 solution and synergistic effect of iodide ions",

abstract = "The corrosion inhibition of Al in 0.5 M H2SO4 solution by poly (methacrylic acid) (PMAA) alone and in combination with iodide ions was studied at 303-333 K using gravimetric, electrochemical impedance spectroscopy, potentiodynamic polarization, scanning electron microscopy and water contact angle measurements techniques. Results obtained show that PMAA moderately inhibited the dissolution of Al in the corrosive medium. Addition of Iodide ions synergistically upgrades the inhibition efficiency of PMAA to a maximum value of 82.6%. From polarization results, PMAA and PMAA + KI can be classified as mixed-type corrosion inhibitor. Thermodynamic parameters namely Gibbs free energy of adsorption, activation energy and enthalpy of activation revealed that the adsorption processes of PMAA and PMAA + KI are endothermic reactions mainly by a physisorption mechanism and followed El-Awady et al. thermodynamic-kinetic adsorption isotherm.",

keywords = "Aluminum, Corrosion, Electrochemical impedance spectroscopy, Poly (methacrylic acid), Scanning electron microscopy, Synergism",

author = "Solomon, {Moses M.} and Umoren, {Saviour A.}",

year = "2015",

month = dec,

day = "12",

doi = "10.1016/j.measurement.2015.08.029",

language = "English",

volume = "76",

pages = "104--116",

journal = "Measurement: Journal of the International Measurement Confederation",

issn = "0263-2241",

publisher = "Elsevier B.V.",

}

Electrochemical and gravimetric measurements of inhibition of aluminum corrosion by poly (methacrylic acid) in H₂SO₄ solution and synergistic effect of iodide ions. / Solomon, Moses M.; Umoren, Saviour A.
In: Measurement: Journal of the International Measurement Confederation, Vol. 76, 12.12.2015, p. 104-116.

Research output: Journal Publication › Article › peer-review

TY - JOUR

T1 - Electrochemical and gravimetric measurements of inhibition of aluminum corrosion by poly (methacrylic acid) in H2SO4 solution and synergistic effect of iodide ions

AU - Solomon, Moses M.

AU - Umoren, Saviour A.

PY - 2015/12/12

Y1 - 2015/12/12

N2 - The corrosion inhibition of Al in 0.5 M H2SO4 solution by poly (methacrylic acid) (PMAA) alone and in combination with iodide ions was studied at 303-333 K using gravimetric, electrochemical impedance spectroscopy, potentiodynamic polarization, scanning electron microscopy and water contact angle measurements techniques. Results obtained show that PMAA moderately inhibited the dissolution of Al in the corrosive medium. Addition of Iodide ions synergistically upgrades the inhibition efficiency of PMAA to a maximum value of 82.6%. From polarization results, PMAA and PMAA + KI can be classified as mixed-type corrosion inhibitor. Thermodynamic parameters namely Gibbs free energy of adsorption, activation energy and enthalpy of activation revealed that the adsorption processes of PMAA and PMAA + KI are endothermic reactions mainly by a physisorption mechanism and followed El-Awady et al. thermodynamic-kinetic adsorption isotherm.

AB - The corrosion inhibition of Al in 0.5 M H2SO4 solution by poly (methacrylic acid) (PMAA) alone and in combination with iodide ions was studied at 303-333 K using gravimetric, electrochemical impedance spectroscopy, potentiodynamic polarization, scanning electron microscopy and water contact angle measurements techniques. Results obtained show that PMAA moderately inhibited the dissolution of Al in the corrosive medium. Addition of Iodide ions synergistically upgrades the inhibition efficiency of PMAA to a maximum value of 82.6%. From polarization results, PMAA and PMAA + KI can be classified as mixed-type corrosion inhibitor. Thermodynamic parameters namely Gibbs free energy of adsorption, activation energy and enthalpy of activation revealed that the adsorption processes of PMAA and PMAA + KI are endothermic reactions mainly by a physisorption mechanism and followed El-Awady et al. thermodynamic-kinetic adsorption isotherm.

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KW - Corrosion

KW - Electrochemical impedance spectroscopy

KW - Poly (methacrylic acid)

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KW - Synergism

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