Corrosion inhibition of mild steel in 1 M HCl was investigated in the absence and presence of different concentrations of Caffeine. Weight loss, potentiodynamic polarization and electrochemical impedance spectroscopy techniques were employed. Impedance measurements showed that the double-layer capacitance decreased and charge-transfer resistance increased with increase in the inhibitor concentration and hence increasing in inhibition efficiency. Potentiodynamic polarization study showed that the inhibitor act as cathodic-type inhibitor. The inhibitor was adsorbed on the steel surface according to the Langmuir adsorption isotherm model and quantum calculation parameters (dipole moment, E_HOMO, E_LUMO and ΔE). It was concluded that the high corrosion inhibition efficiency of Caffeine was associated with its strong adsorption as a barrier film on the mild steel surface. E (%) values obtained from various methods used are in good agreement.

Title

Physical and Chemical News

Publisher

Best Edition

Publisher Country

Morocco

Indexing

Scopus

Impact Factor

None

Publication Type

Both (Printed and Online)

Volume

70

Year

2013

Pages

84-90