Sathiyapriya, T and Rathika, G (2019) In depth analysis of anti corrosion behaviour of eco friendly gum exudate for mild steel in sulphuric acid medium. Journal of Adhesion Science and Technology. pp. 1-19. ISSN 1568-5616

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Abstract

The current research work was keen to examine the corrosion
inhibition efficiency of mild steel (MS) in presence of aqueous
extract of Araucaria heterophylla Gum (AHG) in 1 M H2SO4
medium. The phytoconstituents of the AHG were interpreted by
GC-MS and corrosion inhibition efficiency was deduced using
other techniques like weight loss method, potentiodynamic polarization, electrochemical impedance spectroscopy (EIS). Adsorption
of inhibitor molecules on the mild steel surface was supported by
Density Functional Theory (DFT) studies, Scanning Electron
Microscopy (SEM) and Atomic Force Microscopy (AFM). It is seen
from the results that the inhibitor exhibits optimum efficiency of
78.57% at 0.05% v/v on mild steel specimen in 1 M H2SO4
medium at room temperature. Tafel polarizations clearly show
that the aqueous extract of AHG acts as a mixed type inhibitor.
The change in the EIS parameters in presence of inhibitor is investigative of the protective layer formation of the mild steel surface.
The adsorption is found to obey Langmuir adsorption isotherm.
Thermodynamic and activation parameters for the corrosion
inhibition process supported the physical adsorption mechanism

Item Type: Article
Uncontrolled Keywords: GC-MS; Tafel polarization; electrochemical impedance; DFT; surface morphology
Divisions: PSG College of Arts and Science > Department of Chemistry
Depositing User: Mr Team Mosys
Date Deposited: 16 Aug 2022 09:21
Last Modified: 16 Aug 2022 09:21
URI: http://ir.psgcas.ac.in/id/eprint/1472

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