Journal
ARABIAN JOURNAL OF CHEMISTRY
Volume 9, Issue -, Pages S1069-S1076Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.arabjc.2011.11.012
Keywords
Corrosion inhibition; Acid cleaning; Sulfamic acid; Amino acids; EIS; EFM
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Sulfamic acid is widely used in various industrial acid cleaning applications. In the present work, the inhibition effect of Tryptophan (Tryp) on the corrosion of low alloy steel in sulfamic acid solutions at four different temperatures was studied. The investigations involved electrochemical methods (electrochemical impedance spectroscopy; EIS and the new technique electrochemical frequency modulation; EFM) as well as gravimetric measurements. The inhibition efficiency and the apparent activation energy have been calculated in the presence and in the absence of Tryp. It is most probable that the inhibition property of Tryp was due to the electrostatic adsorption of the protonated form of Tryp on the steel surface. Adsorption of the inhibitor molecule, onto the steel surface followed the Temkin adsorption isotherm. The thermodynamic parameters of adsorption were determined and discussed. All of the obtained data from the three techniques were in close agreement, which confirmed that EFM technique can be used efficiently for monitoring the corrosion inhibition under the studied conditions. (C) 2011 Production and hosting by Elsevier B.V. on behalf of King Saud University.
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