Effect of Tryptophan on the corrosion behavior of low alloy steel in sulfamic acid
| Autor: | S.M. Abd El Wahaab, Hesham T. M. Abdel-Fatah, Aliaa A. M. Hassan, S.M. Rashwan |
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| Rok vydání: | 2016 |
| Předmět: |
Chemistry(all)
General Chemical Engineering Inorganic chemistry Alloy steel EFM 02 engineering and technology Activation energy engineering.material Corrosion inhibition 010402 general chemistry Electrochemistry 01 natural sciences Corrosion lcsh:Chemistry chemistry.chemical_compound Adsorption Sulfamic acid GeneralLiterature_REFERENCE(e.g. dictionaries encyclopedias glossaries) ComputingMilieux_MISCELLANEOUS EIS Acid cleaning General Chemistry 021001 nanoscience & nanotechnology 0104 chemical sciences Dielectric spectroscopy lcsh:QD1-999 chemistry Chemical Engineering(all) engineering Amino acids Gravimetric analysis 0210 nano-technology |
| Zdroj: | Arabian Journal of Chemistry, Vol 9, Iss S2, Pp S1069-S1076 (2016) |
| ISSN: | 1878-5352 |
| DOI: | 10.1016/j.arabjc.2011.11.012 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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