Experimental and theoretical study of [N-substituted] p-aminoazobenzene derivatives as corrosion inhibitors for mild steel in sulfuric acid solution

• [N-substituted] p-aminoazobenzene derivatives were prepared as corrosion inhibitors.
• Corrosion inhibitors were tested for mild steel in 1 M H2SO4 solution.
• Weight loss measurements achieved in absence and presence of inhibitors.
• Theoretical approach was studied adsorption process of corrosion inhibitors.

[N-substituted] p-aminoazobenzene derivatives (1), (2), (3), (4) and (5) were prepared and investigated as corrosion inhibitors for mild steel in 1 M H2SO4 solution by weight loss measurements. It has been observed that the corrosion rate decreases, inhibition efficiencies increase and surface coverage degree increases with increasing inhibitor concentration. Inhibition efficiencies for prepared compounds were ordered: (1) > (2) > (5) > (4) > (3) with the highest inhibiting efficiency of 63% for 10−3 M. The values of ΔGadso are showing physisorption effect for all prepared compounds. Semiempirical molecular orbital calculations for (1), (2), (3), (4) and (5) could be used as a useful tool to obtain information for explaining the nature of interaction between the metal surface and the organic molecule as a corrosion inhibitor.

In this work, [N-substituted] p-aminoazobenzene derivatives were prepared and investigated as corrosion inhibitor for mild steel in 1 M H2SO4 solution by weight loss measurements. Semiempirical molecular orbital calculations were carried out for prepared compounds as molecular models and gave useful information to explain the interaction between the surface of metal and the organic molecules as corrosion inhibitors.Figure optionsDownload as PowerPoint slide