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      Guar Gum as an Eco-Friendly Corrosion Inhibitor for Pure Aluminium in 1-M HCl Solution

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          Abstract

          Guar gum (GG) was investigated as a possible eco-friendly corrosion inhibitor for pure aluminium in a 1-M HCl solution at different temperatures and immersion times using gravimetric and electrochemical techniques. The results showed that GG was a good corrosion inhibitor for pure aluminium in the studied environment. The inhibition efficiency of GG increased with increasing inhibitor concentration and immersion time but decreased with increasing temperature. Polarisation measurements revealed that GG was a mixed type inhibitor with a higher influence on the cathodic reaction. The adsorption behaviour of the investigated inhibitor was found to obey the Temkin adsorption isotherm and the calculated values of the standard free adsorption energy indicate mixed-type adsorption, with the physical adsorption being more dominant. The associated activation energy ( E a ) and the heat of adsorption ( Q a ) supported the physical adsorption nature of the inhibitor. Fourier-transform infrared spectroscopy (FTIR) and Raman/SERS were used to explain the adsorption interaction between the inhibitor with the surface of the metal. The results suggested that most inhibition action of GG is due to its adsorption of the metal surface via H-bond formation.

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          Is the Free Energy Change of Adsorption Correctly Calculated?

          Yu Liu (2009)
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            Thermodynamic study of metal corrosion and inhibitor adsorption processes in mild steel/1-methyl-4[4′(-X)-styryl pyridinium iodides/hydrochloric acid systems

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              Interaction of Pb2+ with hydrous γ-Al2O3

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                Author and article information

                Journal
                Materials (Basel)
                Materials (Basel)
                materials
                Materials
                MDPI
                1996-1944
                16 August 2019
                August 2019
                : 12
                : 16
                : 2620
                Affiliations
                [1 ]Faculty of Foundry Engineering, AGH University of Science and Technology, Reymonta St. 23, 30-059 Krakow, Poland
                [2 ]Academic Centre for Materials and Nanotechnology, AGH University of Science and Technology, Mickiewicza St. 30, 30-049 Kraków, Poland
                Author notes
                [* ]Correspondence: gpalumbo@ 123456agh.edu.pl ; Tel.: +48-12-888-27-63
                Author information
                https://orcid.org/0000-0003-2184-5902
                Article
                materials-12-02620
                10.3390/ma12162620
                6720888
                31426447
                037e634f-645e-4a99-8eb1-2b0b277b033a
                © 2019 by the authors.

                Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license ( http://creativecommons.org/licenses/by/4.0/).

                History
                : 08 July 2019
                : 14 August 2019
                Categories
                Article

                corrosion inhibition,pure aluminium,guar gum,natural inhibitor,ftir,raman

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