Study of corrosion inhibitor of carbon steel in acidic medium usining aromatic Azo-Schiff base compound

Abstract EN

The aromatic Schiff base with azo linkage 4-(((3-((4-acetylphenyl) diazenyl )-2- hydroxynaphthalen-l-yl)methylene)amino)benzoic acid (CHAB) has been synthesized and characterized by FT-IR.

]H NMR and 13C NMR spectroscopic techniques.

The compound (CHAB) has been evaluated as corrosion Inhibitor for carbon steel at different concentrations (0.1, 0.5.

1 and 5 mM) and different temperatures (298-318K).

The corrosion inhibition efficiency was studied by Potentiodynamic polarization .

The effects of concentration and temperature on the inhibition efficiency were studied by Potentiodynamic polarization measurements, the results showed that increasing concentration of (CHAB) increases the inhibition efficiency while increasing the temperature decreases it, the highest corrosion inhibition efficiency.

94.77 % was recorded with 5 mM of CHAB at 298 K in 1 M HC1 .

The adsorption process was found to obey Langmuir isotherm, and the adsorption thermodynamic parameters were studied such us AG°ads .

AH°ads and AS°ads .