Abstract
In this study, corrosion inhibiting properties of amino pentadecylphenols (APPs) derived from Cashew Nut Shell Liquid (CNSL) on mild steel in aerated 0.10 M HCl at 303 K were studied using Electrochemical Impedance Spectroscopy (EIS) and potentiodynamic polarization measurements. Both methods indicated the potential of a mixture of amino pentadecyphenols to serve as a corrosion inhibitor in mild steel in 0.10 M HCl. Corrosion inhibition efficiencies were observed to increase with increase in the inhibitor concentration, with maximum corrosion inhibition of about 98% at inhibitor concentration of 600 ppm. The adsorption of the inhibitor on mild steel surface was found to obey Temkin adsorption isotherm, signifying physical adsorption of the inhibitor molecules on mild steel surface.
Highlights
Mild steel substances are the most widely used group of materials in construction and industrial applications
In an effort to synthesize poly(APP-co-EGDMA) [6], we recently reported modification of Cashw Nut Shell Liquid (CNSL) to form a mixture of amino pentadecylphenols (APPs), i.e. 5-pentadecyl-2,4-diaminophenol and 3-pentadecyl-2,4,6-triaminophenol
This indicates adsorption of the inhibitor molecules on the mild steel surface, a result which is in agreement with findings reported elsewhere [7]
Summary
Mild steel substances are the most widely used group of materials in construction and industrial applications. The usefulness of these materials is challenged by corrosion, an electrochemical reaction that results into gradual destruction of metallic substrates through anodic dissolution [1]. The use of corrosion inhibitors to modify the environment in which a metallic substrate is used, especially in piping and storage systems, is considered to be the most versatile, practical and economical [2]. A corrosion inhibitor is a chemical substance that is added in small concentration to the corrosive media. The concentration of the inhibitor should be small which does not alter physical characteristics of the media, it should be sufficient to reduce significantly the rate of metal corrosion [3]
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