ELECTROCHEMICAL STUDY OF FeS DISSOLUTION IN ACID SOLUTIONS IN THE PRESENCE OF BENZOTHIAZOLIC COMPOUNDS

The corrosion and inhibition behaviour of iron monosulfide (FeS) in 0.1M HCl solution in the absence and the presence of 2-(cyclohexylaminomercapto)-benzothiazole (CMB) and 2-mercaptobenzothiazole (MBT) was investigated using electrochemical measurements such as: Tafel polarization (TP) and electrochemical impedance spectroscopy (EIS). The morphology of FeS surface was examinated using scanning electron microscopy (SEM) analysis. The inhibition efficiency (IE %) increased with benzothiazolic compounds concentration and the experimental results suggest that the presence of CMB and MBT in the solution increases the surface coverage (theta) and therefore, indicate the adsorption of organic compounds. The adsorption of CMB compound on the metal surface obeys Temkin's adsorption isotherm. SEM images showed the evidence modification of FeS surfaces morphology corroded in presence of the inhibitors.