Colocid Dye - A Potential Corrosion Inhibitor for the Corrosion of Mild Steel in Acid Media

Vadivel Sivakumar,Kaithamalai Velumani,Subramaniam Rameshkumar

doi:10.1590/1980-5373-mr-2017-0167

Abstract

Corrosion inhibition nature of Colocid dye on the corrosion of mild steel in acid media was analyzed using weightloss and electrochemical methods. The results of electrochemical and weightloss studies indicated that Colocid acid could act as a potential inhibitor for mild steel in acid media. It has been observed that the inhibition efficiency increases with inhibitor concentration and the inhibition efficiency of Colocid acid dye for the corrosion of mild steel in 1.0 M HCl solution is larger than that in 0.5 M H2SO4 solution.Potentiodynamic polarization studies showed that the dye molecule is of mixed type inhibitor. The adsorption of the compound on the mild steel surface obeyed Langmuir adsorption isotherm. The potential of zero charge was measured to find corrosion inhibition mechanism in these media.

Highlights

The reaction of metals with their environment causes corrosion
The corrosion inhibition efficiency increased with inhibitor concentration in the acid media
The corrosion inhibition performance of Colocid dye on the corrosion of mild steel was compared in two acid media (1.0 M HCl and 0.5 M H2SO4) using weight loss and electrochemical methods

Summary

Introduction

The reaction of metals with their environment causes corrosion. The corrosion behavior of metal is due to its natural tendency to combine with chemical elements in their environment to return to its lowest energy state. The phenomenon corrosion is always linked with an environment. The corrosion behavior of a material cannot be described unless the environment in which the material is to be exposed is identified. The corrosivity or aggressiveness of an environment cannot be described unless the material that is to be exposed to that environment is identified[1]. The general relation existing among the rate of corrosion, the corrosivity of the environment, and the corrosion resistance of a material is[1]: corrosivity of the environment corrosion resis tan ce of the metal rate of corrosive attack (1)

Methods

Results

Conclusion