Synergistic effects of aminotris(methylene phosphonic acid) and Zn²⁺ on the carbon steel corrosion in acid media: An experimental and theoretical approach

• C. Mahmou¹, E.M. Bouissoui², F. Bouhlal², N. Labjar², I. Merimi³, S. Kaya⁴, B. El Ibrahimi⁵, M. Chellouli⁶, A. Dahrouch¹ and S. El Hajjaji¹

¹ LS3MN2E-CERNE2D, Faculty of Sciences, Mohammed V University in Rabat, Morocco 2LS3MN2E-CERNE2D, ENSAM, Mohammed V University in Rabat, Morocco
² LS3MN2E-CERNE2D, ENSAM, Mohammed V University in Rabat, Morocco
³ Laboratory of Applied Analytical Chemistry, Materials and Environment (LC2AME), Faculty of Sciences, University Mohammed First, Oujda, Morocco
⁴ Sivas Cumhuriyet University, Health Services Vocational School, Department of Pharmacy, 58140 Sivas, Turkey
⁵ Applied Chemistry-Physic Team, Faculty of Sciences, University of Ibn Zohr, P.O. Box 8106, Cité Dakhla, Agadir, Morocco
⁶ LMCVRS, Department of Chemistry, Faculty of Sciences and Technologies, Hassan II University of Casablanca, Morocco

Abstract: The corrosion of metals and alloys causes considerable material losses, both in direct and indirect ways, for industry and society every year. Each year, corrosion destroys an amount of steel equivalent to one quarter of annual global production. Across a variety of industries, corrosion results in equipment break down which leads to a major financial loss. While there are several methods to prevent and/or retard corrosion of metallic materials, the use of inhibitors is one of the most effective strategies to ensure the protection of these materials, in environments characterized by contact with aggressive acid media. This study utilized gravimetric analysis, polarization, EIS, adsorption, and computational methods to research the synergistic effects of aminotris(methylenephosphonic acid) (ATMP) and (Zn²⁺) on corrosion inhibition of carbon steel in hydrochloric acid. The study revealed that the efficiency of the inhibition varies depending on the ATMP/Zn²⁺ ratio. For 10^–2 M of ATMP and 10^–3 M of Zn²⁺, the maximum inhibition effect value is obtained. The effects of the synergism depend on both the temperature and ratio of ATMP/Zn²⁺. From the results observed in this study, the synergistic parameter was found to be greater than 1. To theoretically analyze the corrosion inhibition performances of studied compounds, DFT and Monte Carlo Simulation approaches are considered. It is important to note that the theoretical acquired data support the experimental observations.

Keywords: carbon steel, acid media, corrosion, adsorption, organic compounds, electrochemical techniques, synergism

Int. J. Corros. Scale Inhib., 2021, 10, no. 3, 1245-1281
doi: 10.17675/2305-6894-2021-10-3-24

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