Abstract
The inhibition effect of grieseofulvin against the mild steel corrosion in 1 M HCl solution has been investigated by potentiodynamic polarization measurements, electrochemical impedance spectroscopy (EIS) and quantum chemical methods. It was found thatgrieseofulvin acts as a good mild steel corrosion inhibitor in the acid solution at temperature ranging from 298-328 K. The potentiodynamic polarization study reveals that grieseofulvin acts as mixed type inhibitor. The adsorption of grieseofulvin on mild steel follows the Langmuir adsorption isotherm. Scanning electron microscopy equipped with energy dispersive spectroscopy (SEM-EDS) studies established that grieseofulvin formed a protective layer on the surface of mild steel.
Highlights
Mild steel corrosion inhibition is a matter of theoretical as well as practical importance which is an engineering material widely used in process industries, boilers, oil and gas, water pipelines, cooling water systems and refining and extraction etc. several acidic solutions are widely used in many industrial process such as acid cleaning, acid pickling, oil well acidizing and acid descaling.[1,2,3]
The aim of the present study is to investigate the mild steel corrosion behaviour in 1 M HCl in the presence and absence of antifungal drug namely, Grieseofulvin which is the commercial name of 7-chloro-2',4,6-trimethoxy-6'methyl-3H,4'H-spiro[1-benzofuran-2,1'-cyclohex[2]ene]3,4'-dione.[11]
Impedance analysis shows that grieseofulvin reducing the rate of charge transfer process by forming protective layer on the mild steel surface
Summary
Mild steel corrosion inhibition is a matter of theoretical as well as practical importance which is an engineering material widely used in process industries, boilers, oil and gas, water pipelines, cooling water systems and refining and extraction etc. several acidic solutions are widely used in many industrial process such as acid cleaning, acid pickling, oil well acidizing and acid descaling.[1,2,3] These process generally leads to serious metallic corrosion. Mild steel corrosion inhibition is a matter of theoretical as well as practical importance which is an engineering material widely used in process industries, boilers, oil and gas, water pipelines, cooling water systems and refining and extraction etc. Use of an inhibitors is the sensible and most effective approach to protect the metal from corrosion.[4] Electronic characteristics and molecular structure of inhibitors molecules are the main factors in establishing the adsorption capability of inhibitors on metal surfaces.[5] The greater efficiency of these inhibitors is associated to the presence of various polar elements such as N, O, S and P in the organic molecules as well as pi electrons.[6,7,8] The presence of such hetero atoms with lone pair(s) of electrons and electrons in the molecular structure increase the adsorption ability of inhibitor molecules on the metal surface.[9] The inhibitive effect of some antibacterial drugs namely cloxacillin, amoxicillin, ampicillin and flucloxacillin was studied. The corrosion inhibition mechanism of these drugs was attributed to blocking the metal surface by the formation of protective film.[10]
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