The inhibition action of tyrosine on the corrosion of low chromium steel in 7 wt percent sulfamic acid

Purpose - The purpose of this paper is to carry out laboratory studies of the inhibition effect of tyrosine (Tyr) on the corrosion of low chromium alloy steel (ASTM A213 grade T22) in 7 wt percent sulfamic acid solutions.Design methodology approach - The corrosion inhibitive effect of Tyr was invest...

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Bibliographic Details
Published in:Anti-corrosion methods and materials 2012-01, Vol.59 (1), p.23-31
Main Author: Tawfik M. Abdel-Fatah, Hesham
Format: Article
Language:English
Subjects:
Adsorption
Alloy steels
Amino acids
Analytical methods
Causality
Chromium
Chromium base alloys
Chromium steel
Chromium steels
Corrosion
Corrosion effects
Corrosion inhibitors
Corrosion rate
Electrochemical impedance spectroscopy
Electrochemistry
Electrodes
Experiments
Frequency modulation
Inhibition
Inhibitors
Software
Steel
Steels
Studies
Sulfamic acid
Surface chemistry
Temperature
Tyrosine
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Summary:Purpose - The purpose of this paper is to carry out laboratory studies of the inhibition effect of tyrosine (Tyr) on the corrosion of low chromium alloy steel (ASTM A213 grade T22) in 7 wt percent sulfamic acid solutions.Design methodology approach - The corrosion inhibitive effect of Tyr was investigated using electrochemical impedance spectroscopy (EIS) and the new technique electrochemical frequency modulation (EFM).Findings - It was found that the inhibition efficiency increased with increasing inhibitor concentration, while a decrease was detected with the rise of temperature and stirring speed. The corrosion inhibition is due to physical adsorption of Tyr on the steel surface. Adsorption of the inhibitor molecule, onto the steel surface follows the Temkin's adsorption isotherm.Originality value - The obtained results from both methods (EIS and EFM) at different experimental conditions were in high agreement and almost similar. This is an indication that the EFM technique can be used efficiently for monitoring the corrosion inhibition under the studied conditions.
ISSN:0003-5599
1758-4221
DOI:10.1108/00035591211190517