Synthesis, Cyclic Voltammetric, Electrochemical, and Gravimetric Corrosion Inhibition Investigations of Schiff Base Derived from 5,5-Dimethyl-1,3-cyclohexanedione and 2-Aminophenol on Mild Steel in 1 M HCl and 0.5 M H2SO4

Ragi Kooliyat,Sini Varghese Cheruvathur,Binsi M Paulson,Vinod P Raphael,Joby Thomas Kakkassery

doi:10.1155/2019/1094148

Ragi Kooliyat, Sini Varghese Cheruvathur + Show 3 more

Open Access

https://doi.org/10.1155/2019/1094148

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Abstract

Schiff base 2,2’-(5,5-dimethylcyclohexane-1,3-diylidene)bis(azan-1-yl-1-ylidene) diphenol (DmChDp) was synthesized and characterized using spectroscopic methods (IR, UV, NMR, and Mass) and cyclic voltammetric (CV) studies. The corrosion inhibition potency of (DmChDp) on mild steel (MS) in 1M HCl and 0.5M H2SO4was investigated. The corrosion monitoring techniques employed for this purpose are gravimetric and electrochemical methods (EIS and potentiodynamic polarization studies). The study reveals that the Schiff base, DmChDp, acts as excellent corrosion inhibitor on mild steel in 1M HCl. DmChDp obeys Langmuir adsorption isotherm both in 1M HCl and 0.5M H2SO4on MS. Polarization studies show that DmChDp behaves as a mixed type inhibitor in both media. Scanning electron microscopic analysis established the protective nature of DmChDp on mild steel surface. The impact of temperature on the corrosion of MS was also evaluated using gravimetric method.

Highlights

Mild steel is used very commonly in industries because of its good weldability due to low carbon content as well as optimum mechanical properties at a cheaper cost [1,2,3,4]
The present paper explores the corrosion inhibition capacity of 2,2’-(5,5-dimethylcyclohexane-1,3-diylidene)bis(azan1-yl-1-ylidene)diphenol (DmChDp) on mild steel in 1M HCl and 0.5M H2SO4 using gravimetric and electrochemical studies
The cyclic voltammogram of DmChDp was recorded in the potential range 1.0 V/s to -2.0 V/s at a scan rate of 0.10 V/s (Figure 2(a))

Summary

Introduction

Mild steel is used very commonly in industries because of its good weldability due to low carbon content as well as optimum mechanical properties at a cheaper cost [1,2,3,4]. They undergo acid attack and get corroded. Benign organic inhibitors containing N, S, and/or O in the conjugated systems replace such toxic inhibitors They inhibit the corrosion by adsorbing on metal surface forming a protective layer and thereby retard dissolution of metal in aggressive solutions [10,11,12,13]. The present paper explores the corrosion inhibition capacity of 2,2’-(5,5-dimethylcyclohexane-1,3-diylidene)bis(azan1-yl-1-ylidene)diphenol (DmChDp) on mild steel in 1M HCl and 0.5M H2SO4 using gravimetric and electrochemical studies

Materials and Methods

Results and Discussion

Weight Loss Measurements

Electrochemical Studies

Conclusions