New Compounds Derived from Nitrophenol Synthesis, Structural investigation and anticorrision Properties

Abstract

A new azo compound [2-((4-hydroxy-3-(E)-(2-hydroxy-5-nitrophenyl)diazenyl)benzaldeyde and the azo schiff derivative [2-((4-hydroxy-3-((E)-(2-hydroxy-5-nitrophenyl)diazenyl)benzylidene)amino)-4-nitrophenol (Azo-S) has been synthesized. ¹³C-NMR, ¹H-NMR, FT-IR, Mass apectroscopy and Uv-Visibl analysis was used to characterized new compounds. The new synthesized compound Azo-S was utilized to inhibit mild steel (MS) corrosion at little concentrations (0.001-0.006) M. Weight loss measurements studies in 1 M HCl and at 298 K  showed that Azo-S has a good corrosion inhibition efficiency, 75%  at 0.002 M of inhibitors.It was found that adsorption methods follow Lanngmuir isotherm with ΔG values around -23.8 kJ/mol, this confirms that a stable protective film is formed for the mild steel spontaneously during physical adsorption.