LB Films of Octadecanoyl Hydroxamic Acid as Barrier against Copper Corrosion

Faraj A. Al-Taher; Mukhtar M.  Shaglouf

doi:10.59743/jmset.v7i2.20

Authors

Faraj A. Al-Taher Chemical Engineering Department, Faculty of Engineering, Sirte University, Sirte, Libya.
Mukhtar M. Shaglouf Chemical Engineering Department, Faculty of Engineering, Sirte University, Sirte, Libya.

DOI:

https://doi.org/10.59743/jmset.v7i2.20

Keywords:

Monohydroxamic acid, LB films, Copper, Corrosion, EIS

Abstract

Free of ions of Octadecanoyl monohydroxamic acid (C₁₈N) and in the presence of Fe³⁺ ion multilayers were deposited on the copper surface as Langmuir-Blodgett (LB) films. Their inhibiting effect on copper corrosion was investigated in 0.1 M sodium sulfate solution by different techniques such as potentiodynamic polarization and by electrochemical impedance spectroscopy (EIS). As well as that, the copper surfaces were visualized using a Scanning electron microscope (SEM). The results showed that the highest inhibition efficiency (92%) was achieved by LB film of 5 monomolecular layers of C₁₈N/Fe³⁺. The LB films work as a cathodic inhibitor which inhibits the cathodic reaction.

The presence of Fe³⁺ ions significantly improves the inhibition efficiency through the formation of a more compact dense layer of C₁₈N/Fe³⁺ complex that blocks the flux of aggressive ions to the metal surface. The effect of immersion time on the inhibiting characteristics of LB films on the copper surfaces was studied.

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