Abstract
The performance of three selected amino acids, namely alanine (Ala), cysteine (Cys) and S-methyl cysteine (S-MCys) as safe corrosion inhibitors for iron in aerated stagnant 1.0 M HCl solutions was evaluated by Tafel polarization and impedance measurements. Results indicate that Ala acts mainly as a cathodic inhibitor, while Cys and S-MCys function as mixed-type inhibitors. Cys, which contains a mercapto group in its molecular structure, was the most effective among the inhibitors tested, while Ala was less effective than S-MCys. The low inhibition efficiency recorded for S-MCys compared with that of Cys was attributed to steric effects caused by the substituent methyl on the mercapto group. Electrochemical frequency modulation (EFM) technique and inductively coupled plasma atomic emission spectrometry (ICP-AES), were also applied to make accurate determination of corrosion rates. Validation of the Tafel extrapolation method for measuring corrosion rates was tested. Rates of corrosion rates (in {mu}m y{sup -1}) obtained from Tafel extrapolation method are in good agreement with those measured using EFM and ICP methods. Some theoretical studies, including molecular dynamics (MD) and density functional theory (DFT), were also employed to establish the correlation between the structure (molecular and electronic) of the three tested inhibitors and the inhibition efficiency.
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Amin, Mohammed A;
[1]
Materials and Corrosion Lab (MCL), Chemistry Department, Faculty of Science, Taif University, 888 Hawaiya (Saudi Arabia)], E-mail: maaismail@yahoo.com;
Khaled, K F;
[2]
Electrochemistry Research Laboratory, Chemistry Department, Faculty of Education, Ain Shams University, Roxy, Cairo (Egypt)];
Mohsen, Q;
[2]
Arida, H A;
[2]
Hot Laboratories Center, Atomic Energy Authority, 13759 Cairo (Egypt)]
- Chemistry Department, Faculty of Science, Ain Shams University, Abbassia, 11566 Cairo (Egypt)
- Materials and Corrosion Lab (MCL), Chemistry Department, Faculty of Science, Taif University, 888 Hawaiya (Saudi Arabia)
Citation Formats
Amin, Mohammed A, Materials and Corrosion Lab (MCL), Chemistry Department, Faculty of Science, Taif University, 888 Hawaiya (Saudi Arabia)], E-mail: maaismail@yahoo.com, Khaled, K F, Electrochemistry Research Laboratory, Chemistry Department, Faculty of Education, Ain Shams University, Roxy, Cairo (Egypt)], Mohsen, Q, Arida, H A, and Hot Laboratories Center, Atomic Energy Authority, 13759 Cairo (Egypt)].
A study of the inhibition of iron corrosion in HCl solutions by some amino acids.
United Kingdom: N. p.,
2010.
Web.
doi:10.1016/j.corsci.2010.01.019.
Amin, Mohammed A, Materials and Corrosion Lab (MCL), Chemistry Department, Faculty of Science, Taif University, 888 Hawaiya (Saudi Arabia)], E-mail: maaismail@yahoo.com, Khaled, K F, Electrochemistry Research Laboratory, Chemistry Department, Faculty of Education, Ain Shams University, Roxy, Cairo (Egypt)], Mohsen, Q, Arida, H A, & Hot Laboratories Center, Atomic Energy Authority, 13759 Cairo (Egypt)].
A study of the inhibition of iron corrosion in HCl solutions by some amino acids.
United Kingdom.
https://doi.org/10.1016/j.corsci.2010.01.019
Amin, Mohammed A, Materials and Corrosion Lab (MCL), Chemistry Department, Faculty of Science, Taif University, 888 Hawaiya (Saudi Arabia)], E-mail: maaismail@yahoo.com, Khaled, K F, Electrochemistry Research Laboratory, Chemistry Department, Faculty of Education, Ain Shams University, Roxy, Cairo (Egypt)], Mohsen, Q, Arida, H A, and Hot Laboratories Center, Atomic Energy Authority, 13759 Cairo (Egypt)].
2010.
"A study of the inhibition of iron corrosion in HCl solutions by some amino acids."
United Kingdom.
https://doi.org/10.1016/j.corsci.2010.01.019.
@misc{etde_21332886,
title = {A study of the inhibition of iron corrosion in HCl solutions by some amino acids}
author = {Amin, Mohammed A, Materials and Corrosion Lab (MCL), Chemistry Department, Faculty of Science, Taif University, 888 Hawaiya (Saudi Arabia)], E-mail: maaismail@yahoo.com, Khaled, K F, Electrochemistry Research Laboratory, Chemistry Department, Faculty of Education, Ain Shams University, Roxy, Cairo (Egypt)], Mohsen, Q, Arida, H A, and Hot Laboratories Center, Atomic Energy Authority, 13759 Cairo (Egypt)]}
abstractNote = {The performance of three selected amino acids, namely alanine (Ala), cysteine (Cys) and S-methyl cysteine (S-MCys) as safe corrosion inhibitors for iron in aerated stagnant 1.0 M HCl solutions was evaluated by Tafel polarization and impedance measurements. Results indicate that Ala acts mainly as a cathodic inhibitor, while Cys and S-MCys function as mixed-type inhibitors. Cys, which contains a mercapto group in its molecular structure, was the most effective among the inhibitors tested, while Ala was less effective than S-MCys. The low inhibition efficiency recorded for S-MCys compared with that of Cys was attributed to steric effects caused by the substituent methyl on the mercapto group. Electrochemical frequency modulation (EFM) technique and inductively coupled plasma atomic emission spectrometry (ICP-AES), were also applied to make accurate determination of corrosion rates. Validation of the Tafel extrapolation method for measuring corrosion rates was tested. Rates of corrosion rates (in {mu}m y{sup -1}) obtained from Tafel extrapolation method are in good agreement with those measured using EFM and ICP methods. Some theoretical studies, including molecular dynamics (MD) and density functional theory (DFT), were also employed to establish the correlation between the structure (molecular and electronic) of the three tested inhibitors and the inhibition efficiency. Adsorption via hydrogen bonding was discussed here based on some theoretical studies. Experimental and theoretical results were in good agreement.}
doi = {10.1016/j.corsci.2010.01.019}
journal = []
issue = {5}
volume = {52}
place = {United Kingdom}
year = {2010}
month = {May}
}
title = {A study of the inhibition of iron corrosion in HCl solutions by some amino acids}
author = {Amin, Mohammed A, Materials and Corrosion Lab (MCL), Chemistry Department, Faculty of Science, Taif University, 888 Hawaiya (Saudi Arabia)], E-mail: maaismail@yahoo.com, Khaled, K F, Electrochemistry Research Laboratory, Chemistry Department, Faculty of Education, Ain Shams University, Roxy, Cairo (Egypt)], Mohsen, Q, Arida, H A, and Hot Laboratories Center, Atomic Energy Authority, 13759 Cairo (Egypt)]}
abstractNote = {The performance of three selected amino acids, namely alanine (Ala), cysteine (Cys) and S-methyl cysteine (S-MCys) as safe corrosion inhibitors for iron in aerated stagnant 1.0 M HCl solutions was evaluated by Tafel polarization and impedance measurements. Results indicate that Ala acts mainly as a cathodic inhibitor, while Cys and S-MCys function as mixed-type inhibitors. Cys, which contains a mercapto group in its molecular structure, was the most effective among the inhibitors tested, while Ala was less effective than S-MCys. The low inhibition efficiency recorded for S-MCys compared with that of Cys was attributed to steric effects caused by the substituent methyl on the mercapto group. Electrochemical frequency modulation (EFM) technique and inductively coupled plasma atomic emission spectrometry (ICP-AES), were also applied to make accurate determination of corrosion rates. Validation of the Tafel extrapolation method for measuring corrosion rates was tested. Rates of corrosion rates (in {mu}m y{sup -1}) obtained from Tafel extrapolation method are in good agreement with those measured using EFM and ICP methods. Some theoretical studies, including molecular dynamics (MD) and density functional theory (DFT), were also employed to establish the correlation between the structure (molecular and electronic) of the three tested inhibitors and the inhibition efficiency. Adsorption via hydrogen bonding was discussed here based on some theoretical studies. Experimental and theoretical results were in good agreement.}
doi = {10.1016/j.corsci.2010.01.019}
journal = []
issue = {5}
volume = {52}
place = {United Kingdom}
year = {2010}
month = {May}
}