The synergistic effect of polyacrylamide and iodide ions on the corrosion inhibition of mild steel in H2SO4

S. A. Umoren; E. E. Ebenso

doi:10.1016/j.matchemphys.2007.06.018

The synergistic effect of polyacrylamide and iodide ions on the corrosion inhibition of mild steel in H₂SO₄

S. A. Umoren^*
, E. E. Ebenso

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

182 Scopus citations

Abstract

The corrosion inhibition of mild steel in 1 M H₂SO₄ using polyacrylamide (PA) in the presence of iodide ions was studied at 30-60 °C using weight loss and hydrogen evolution methods. Results obtained showed that inhibition efficiency increased with increase in concentration of PA and decreased with increase in temperature. The inhibition efficiency of PA synergistically increased on addition of KI. The adsorption of PA alone and in combination with iodide ions on the metal surface is found to obey Freundlich, Temkin and Flory-Huggins adsorption isotherms at all temperatures studied. Phenomenon of physical adsorption is proposed from the values of E_a and Δ G_ads^° obtained. Synergism parameter evaluated is found to be greater than unity for all concentrations of PA indicating that the enhanced inhibition efficiency of PA caused by addition of iodide ion is only due to synergism. Adsorption of PA and (PA + KI) on to mild steel surface is spontaneous.

Original language	English
Pages (from-to)	387-393
Number of pages	7
Journal	Materials Chemistry and Physics
Volume	106
Issue number	2-3
DOIs	https://doi.org/10.1016/j.matchemphys.2007.06.018
State	Published - 25 Dec 2007
Externally published	Yes

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

SDG 7 Affordable and Clean Energy

Keywords

Adsorption isotherms
Corrosion
Iodide ions
Mild steel
Polyacrylamide
Synergistic effect

ASJC Scopus subject areas

General Materials Science
Condensed Matter Physics

Access to Document

10.1016/j.matchemphys.2007.06.018

Cite this

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title = "The synergistic effect of polyacrylamide and iodide ions on the corrosion inhibition of mild steel in H2SO4",

abstract = "The corrosion inhibition of mild steel in 1 M H2SO4 using polyacrylamide (PA) in the presence of iodide ions was studied at 30-60 °C using weight loss and hydrogen evolution methods. Results obtained showed that inhibition efficiency increased with increase in concentration of PA and decreased with increase in temperature. The inhibition efficiency of PA synergistically increased on addition of KI. The adsorption of PA alone and in combination with iodide ions on the metal surface is found to obey Freundlich, Temkin and Flory-Huggins adsorption isotherms at all temperatures studied. Phenomenon of physical adsorption is proposed from the values of Ea and Δ Gads° obtained. Synergism parameter evaluated is found to be greater than unity for all concentrations of PA indicating that the enhanced inhibition efficiency of PA caused by addition of iodide ion is only due to synergism. Adsorption of PA and (PA + KI) on to mild steel surface is spontaneous.",

keywords = "Adsorption isotherms, Corrosion, Iodide ions, Mild steel, Polyacrylamide, Synergistic effect",

author = "Umoren, \{S. A.\} and Ebenso, \{E. E.\}",

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TY - JOUR

T1 - The synergistic effect of polyacrylamide and iodide ions on the corrosion inhibition of mild steel in H2SO4

AU - Umoren, S. A.

AU - Ebenso, E. E.

PY - 2007/12/25

Y1 - 2007/12/25

N2 - The corrosion inhibition of mild steel in 1 M H2SO4 using polyacrylamide (PA) in the presence of iodide ions was studied at 30-60 °C using weight loss and hydrogen evolution methods. Results obtained showed that inhibition efficiency increased with increase in concentration of PA and decreased with increase in temperature. The inhibition efficiency of PA synergistically increased on addition of KI. The adsorption of PA alone and in combination with iodide ions on the metal surface is found to obey Freundlich, Temkin and Flory-Huggins adsorption isotherms at all temperatures studied. Phenomenon of physical adsorption is proposed from the values of Ea and Δ Gads° obtained. Synergism parameter evaluated is found to be greater than unity for all concentrations of PA indicating that the enhanced inhibition efficiency of PA caused by addition of iodide ion is only due to synergism. Adsorption of PA and (PA + KI) on to mild steel surface is spontaneous.

AB - The corrosion inhibition of mild steel in 1 M H2SO4 using polyacrylamide (PA) in the presence of iodide ions was studied at 30-60 °C using weight loss and hydrogen evolution methods. Results obtained showed that inhibition efficiency increased with increase in concentration of PA and decreased with increase in temperature. The inhibition efficiency of PA synergistically increased on addition of KI. The adsorption of PA alone and in combination with iodide ions on the metal surface is found to obey Freundlich, Temkin and Flory-Huggins adsorption isotherms at all temperatures studied. Phenomenon of physical adsorption is proposed from the values of Ea and Δ Gads° obtained. Synergism parameter evaluated is found to be greater than unity for all concentrations of PA indicating that the enhanced inhibition efficiency of PA caused by addition of iodide ion is only due to synergism. Adsorption of PA and (PA + KI) on to mild steel surface is spontaneous.

KW - Adsorption isotherms

KW - Corrosion

KW - Iodide ions

KW - Mild steel

KW - Polyacrylamide

KW - Synergistic effect

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DO - 10.1016/j.matchemphys.2007.06.018

M3 - Article

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SN - 0254-0584

VL - 106

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JO - Materials Chemistry and Physics

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