Calixarene molecule as an effective inhibitor of copper corrosion in 2.0 M H3PO4 and 0.5 M H2SO4 solutions

• N. M’Hanni¹, M. Galai¹, M. Ouakki², M. Ebn Touhami¹, E.H. Rifi¹ and Z. Asfari³

¹ Advanced Materials and Process Engineering, Faculty of Sciences, Ibn Tofaïl University, PO Box 133, 14000, Kenitra, Morocco
² Laboratory of Organic, Inorganic Chemistry, Electrochemistry and Environment, Faculty of Sciences, Ibn Tofaïl University, PO Box 133, 14000, Kenitra, Morocco
³ Laboratory of Molecular Engineering Applied to the Analysis, IPHC, UMR 7178 CNRS, University of Strasbourg, ECPM, 25 street Becquerel, 67087 Strasbourg Cedex 2, France

Abstract: The comparative study of the inhibition and adsorption properties of organic molecule Calixarene (Calix) as a corrosion inhibitor in 2.0 M phosphoric acid and 0.5 M sulfuric acid solutions was done using several methods such as polarization curves, electrochemical impedance spectroscopy (EIS) and scanning electron microscopy (SEM). The results of EIS and polarization measurements showed that the dissolution process of copper occurs under diffusion control. Potentiodynamic polarization curves indicated that the Calixarene behaves as cathodic-type inhibitor. The corrosion rates of copper and the inhibition efficiencies of the additive were calculated. The results obtained show that the calix could serve as an effective copper corrosion inhibitor in both media. However, the sulfuric acid medium shows better results compared to phosphoric acid. The inhibition mechanisms, estimated from the temperature dependence of inhibition efficiency as well as from kinetic and activation parameters, show that the additive operates according to a mixed inhibition mechanism. It is suggested that molecular as well as protonated organic species in the Calix contribute to the observed inhibiting action.

Keywords: electrochemical technique, calixarene, corrosion, copper, H3PO4, H2SO4

Int. J. Corros. Scale Inhib., 2021, 10, no. 3, 976-993
doi: 10.17675/2305-6894-2021-10-3-10

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