Hydroxymethyl urea and 1,3-bis(hydroxymethyl) urea as corrosion inhibitors for steel in HCl solution |
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| Affiliation: | 1. Department of Chemical Engineering, Faculty of Engineering, Golestan University, Aliabad Katoul, Iran;2. Department of Surface Coatings and Corrosion, Institute for Color Science and Technology, P.O. Box 16765-654, Tehran, Iran;1. Department of Chemistry, Faculty of Sciences, University Dr Moulay Tahar, Saïda, Algeria;2. Laboratory of Catalysis and Corrosion of Materials, Faculty of Sciences, Chouaib Doukkali University, PO Box 20, M-24000 El Jadida, Morocco;3. Department of Biology, Faculty of Sciences, University Dr Moulay Tahar, Saïda, Algeria;4. Department of Chemistry, Faculty of Sciences, University of Tlemcen, Tlemcen, Algeria;5. Univ. Lille, CNRS, INRA, ENSCL, UMR 8207, - UMET - Unit of Materials and Transformations, F-59000 Lille, France;6. LC2AME-URAC 18, Faculty of Science, First Mohammed University, PO Box 717, M-60000 Oujda, Morocco |
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| Abstract: | The inhibition effect of two urea derivatives of hydroxymethyl urea (HMU) and 1,3-bis(hydroxymethyl) urea (BHMU) on the corrosion of cold rolled steel (CRS) in 1.0 M HCl solution was studied by weight loss, potentiodynamic polarization curves and electrochemical impedance spectroscopy (EIS), quantum chemical calculation and molecular dynamics (MD) simulation methods. Inhibition efficiency values of 20.0 mM HMU and BHMU are higher than 80% and 85% at 20–50 °C, respectively. The adsorption of each inhibitor on steel surface obeys Langmuir adsorption isotherm, and is mainly the chemical adsorption. Inhibition efficiency follows the order: BHMU > HMU. |
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| Keywords: | A Steel B Weight loss B EIS B Polarization B Modeling studies C Acid inhibition |
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