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مهندسی خوردگی 2025, 15(1): 74-74 |
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Evaluating the Corrosion Protection Behavior of Cysteine Amino-Acid on the St12 Steel in the Neutral Chloride Media. مهندسی خوردگی 2025; 15 (1) :74-74
URL: http://journal.ica.ir/article-1-247-en.html
URL: http://journal.ica.ir/article-1-247-en.html
Abstract: (1 Views)
In this study, evaluating the inhibitive mechanism of L-Cysteine through comparing its performance
with the N-Acetyl-L-Cysteine compound on the mild steel in the sodium chloride medium is the main
object. In this investigation, electrochemical impedance spectroscopy technique was used for
electrochemical studying and corrosion protection evaluation in the absence and presence of L-Cysteine
and N-Acetyl-L-Cysteine compounds. Also, surface studies using scanning electron microscopy was
used to study the samples immersed in the L-Cysteine-containing solution. Results showed that LCysteine
form an effective adsorbed layer on the steel surface due to the presence of amine and thiol
groups. However, N-Acetyl-L-Cysteine showed insufficient inhibition and even more, increase the
corrosion rate of steel. According to the results, inhibition efficiency was about 61 percent in the present
of L-Cysteine. The impedance resistance increase from 900 ohm.cm2 to 2300 ohm.cm2 in the presence
of L-cysteine after 6 h immersion. The valuable results about the corrosion control potential of LCysteine
as an amino acid in the neutral medium is proposed in the present investigation. It seems that,
by removing amine group presented in the L-cysteine structure and its deactivation in the form of NAcetyl-
L-Cysteine, the compound could not show any acceptable anti-corrosion performance for mild
steel.
with the N-Acetyl-L-Cysteine compound on the mild steel in the sodium chloride medium is the main
object. In this investigation, electrochemical impedance spectroscopy technique was used for
electrochemical studying and corrosion protection evaluation in the absence and presence of L-Cysteine
and N-Acetyl-L-Cysteine compounds. Also, surface studies using scanning electron microscopy was
used to study the samples immersed in the L-Cysteine-containing solution. Results showed that LCysteine
form an effective adsorbed layer on the steel surface due to the presence of amine and thiol
groups. However, N-Acetyl-L-Cysteine showed insufficient inhibition and even more, increase the
corrosion rate of steel. According to the results, inhibition efficiency was about 61 percent in the present
of L-Cysteine. The impedance resistance increase from 900 ohm.cm2 to 2300 ohm.cm2 in the presence
of L-cysteine after 6 h immersion. The valuable results about the corrosion control potential of LCysteine
as an amino acid in the neutral medium is proposed in the present investigation. It seems that,
by removing amine group presented in the L-cysteine structure and its deactivation in the form of NAcetyl-
L-Cysteine, the compound could not show any acceptable anti-corrosion performance for mild
steel.
Type of Study: Research |
Subject:
General
Received: 2026/01/27 | Accepted: 2025/06/15 | Published: 2025/06/15
Received: 2026/01/27 | Accepted: 2025/06/15 | Published: 2025/06/15
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