Abstract

Hamida Edan Salman¹, Asim A. Balakit²and Ali Ahmed Abdulridha¹

DOI : http://dx.doi.org/10.13005/ojc/340532

A new aromatic Schiff base with azo linkage (AS) has been synthesized and characterized by FT-IR, ¹H NMR and ¹³C NMR spectroscopic techniques. The new compound (AS) has been evaluated as carbon steel corrosion inhibitor at different concentrations (0.005, 0.01, 0.02, 0.04 and 0.08 mM) and different temperatures (303 – 333 K). The corrosion inhibition efficiency was studied by potentiodynamic polarization and weight loss measurements. The effects of concentration and temperature on the inhibition efficiency were studied by potentiodynamic polarization studies, the results showed that increasing concentration of AS increases the inhibition efficiency while increasing the temperature decreases it, the highest corrosion inhibition efficiency, 93.9% was recorded with 0.08 mM of AS at 313 K in 1 M H₂SO₄. Weight loss measurements showed that the inhibition efficiency reached 97.1% in the presence of AS (0.08 mM) at 313 K. The adsorption process was found to obey Langmuir isotherm, and the adsorption thermodynamic parameters were studied. Scanning electron microscope (SEM) was used to confirm the results.

Azo; Carbon Steel; Corrosion Inhibitors; Organic Inhibitors; Schiff base

[ View HTML Full Text]