CORROSION INHIBITION SCREENING OF BROMOSALEN AND BROMOSALEN-MN(II) COMPLEX BY A WEIGHT LOSS METHOD

Abstract

A Schiff base ligand namely Bis(5-bromosalicyaldehyde)ethylenediamine (BromosalEn) derived from 5-bromosalicylaldehyde and ethylenediamine undergo further insertion with Mn(II) were synthesized, characterized and evaluated as corrosion inhibitor for mild steel in 1 M HCl solution using weight loss method. The results suggest that the BromosalEn behaves as a tetradentate ligand coordinate through azomethine nitrogen and phenolic oxygen, produces a tetrahedral geometry for Mn(II) complexes (BromosalEn-Mn(II)). Acidic media playing a crucial role in the corrosion of metal such as vehicles, houses and bridges or on outdoor monuments. In continuation of the research, the synthesized compounds were tested for anti-corrosion activity where they showed an appreciable corrosion inhibition efficiency against the corrosion of mild steel in 1 M HCl solution at 40 °C. It has been found that BromosalEn-Mn(II) shows a greater corrosion inhibition efficiency than BromosalEn. As the concentration of studied inhibitors increases, the corrosion inhibition efficiency of the prepared compounds also increase. This study demonstrated that corrosion inhibitors for metals and alloys can preserve the quality and life of metals from corrosion. In this context, there is an important action to study the effective and easiest ways to produce a high quality of corrosion inhibitor that will reduce the problem of metal corrosion especially in the industry and is aiming to form various compounds for corrosion inhibitors.