تحضير مركبات آزو- شف جديدة واستعالها كمثبطات لتآكل الفولاذ الكربوني في الوسط الحامضي

Synthesis of New Azo-Schiff Compounds and using as Inhibitors For the Carbon Steel Corrosion in acidic medium

A new aromatic Schiff base with azo linkage has been synthesized. The new compound (AS) was used as carbon steel corrosion inhibitor at low concentrations (0.005, 0.01, 0.02, 0.04 and 0.08 mM) with low concentration of tween 80 surfactant (0.01 gm/L). Potentiodynamic polarization studies showed that AS1 and AS2 has an excellent corrosion inhibition efficiency, 93.9% and 98.1% with 0.08 mM of inhibitors at (303 and 313) K respectively in 1 M H2SO4. Weight loss measurements gave supporting results when showed that the inhibition efficiency reached 97.6% and 97.05% in the presence of AS (0.08 mM). The adsorption process was found to obey Lanngmuir isotherm with ΔG values around -23.04 kJmol^-1, indicating the spontaneous formation of stable protection film  through a physisorption process. SEM and AFM analysis was used to confirm the inhibition by comparing the morphology of the corroded surface with the inhibited one.