An electrochemical evaluation of synthesized coumarin-Azo dyes as potential corrosion inhibitors for mild steel in 1 M HCl medium
Document Type
Article
Publication Date
12-1-2020
Abstract
The anti corrosion properties of mild steel were studied in 1.0 M HCl medium with azo-coumarin dyes inhibitor by electrochemical impedance and potentiodynamic polarization measurements. The azo-coumarin dyes 8-10 were synthesized by coupling reaction between diazonium salt of aniline derivatives with 4-hydroxycoumarin under basic condition. The result showed that inhibition efficiency was found to increase (shown average IE > 80%), with increasing the concentration of azocoumarin dyes, and their adsorption over mild steel surface found to obey Langmuir adsorption isotherm. Furthermore, the Langmuir adsorption isotherm parameters made evident that corrosion inhibition proceeds through physisorption mode of interaction. After corrosion evaluation, mild steel's surface morphology was screened via SEM - EDX analysis which showed an improved surface in the presence of azo-coumarin dye derivatives.
Keywords
Corrosion inhibitor, Azo-coumarin dyes, Mild steel, Electrochemical impedance
Divisions
Science,CHEMISTRY
Publication Title
International Journal of Electrochemical Science
Volume
15
Issue
12
Publisher
Electrochemical Science Group
Publisher Location
BORIVOJA STEVANOVICA 25-7, BELGRADE, 11000, SERBIA