Improved corrosion resistance of mild steel in acidic solution : 4-Di-2-(5-phenyloxazolyl)‎-benzene and 4,7-diphenyl-1,10-phenathroline compounds

Abstract EN

The present study is includes the appraisal of inhibitive performance of the 1,4-Di-2-(5-phenyloxazolyl)-benzene and 4,7-diphenyl-1,10-phenathroline compounds as inhibitors on the corrosion behavior of mild steel in 0.5 mol dm-3 hydrochloric acid de – aerated solution at 313.15K were investigated using potentiostatic polarization method .

Polarization curves indicate that both inhibitors were acting as mixed type inhibitors .

The measurements show that inhibition efficiencies increase with increase in inhibitor concentration .

This reveals that inhibitive actions of inhibitors were mainly due to adsorption on the mild steel surface and blocked the active sites .

Adsorption of the 1,4-Di-2-(5-phenyloxazolyl)-benzene and 4,7-diphenyl-1,10-phenathroline inhibitors follows Langmuir adsorption isotherm .

Thermodynamic parameters of adsorption " Kads , ΔGads " of studied inhibitors were calculated using Langmuir adsorption isotherm .

Differences in inhibition efficiency between the 1,4-Di-2-(5-phenyloxazolyl)-benzene and 4,7-diphenyl-1,10-phenathroline inhibitors are correlated with their chemical structures .

Furthermore , the mechanism of inhibition was discussed in the light of the chemical structure of the undertaken inhibitors.