Anti-corrosion performance of the synergistic properties of benzenecarbonitrile and 5-bromovanillin on 1018 carbon steel in HCl environment
No Thumbnail Available
Date
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Abstract
Description
The synergistic properties of the combined admixture of benzenecarbonitrile and 5-bromovanillin
(BNV) on the corrosion resistance of 1018 carbon steel in 1 M HCl was analysed with potentiodynamic
polarization technique, weight loss method, micro-analytical studies and ATF-FTIR spectroscopy.
Results obtained show the admixed organic compound was effective with optimal corrosion inhibition
values of 99.33% and 90.34% at 1.25% BNV concentration from both electrochemical methods due to
the effective inhibition action and passivation characteristics of the protonated inhibitor molecules in
the acid solution. Primary amines, stretch alkyl halides and C-H triple bond functional groups of the
molecules were observed to actively adsorb during the corrosion inhibition reaction from ATF-FTIR
spectroscopic analysis. Calculations from thermodynamic evaluation confirmed cationic adsorption
mechanism to be chemisorption obeying the Langmuir and Frumkin adsorption isotherm. Microanalytical
observations of the inhibited carbon steel morphology significantly contrast the unprotected
steel due to visible surface deterioration and presence of micro/macro-pits. The organic derivatives
showed mixed type inhibition reactions
Keywords
T Technology (General), TJ Mechanical engineering and machinery