Experimental and theoretical study of [N-substituted] p-aminoazobenzene (cas 12-11-3) derivatives as corrosion inhibitors for mild steel in sulfuric acid solution

Add time:07/21/2019    Source:sciencedirect.com

[N-substituted] p-aminoazobenzene (cas 12-11-3) 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.

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