Reaction of poly(methyl methacrylate / maleic anhydride) with phenylhydazine and 4- aminobenzoic acid and their use as mild steel (St-37) corrosion inhibitor

Document Type : Research Article


Malek-ashtar University of Technology


the present study aimed at providing the copolymers of methyl methacrylate / maleic anhydride and the reaction of these copolymers with phenylhydrazine and 4- aminobenzoic acid, and in the following, they were used as the corrosion inhibitor of low carbon steel. The chemical structure of copolymers was identified by spectroscopy of FT-IR and H-NMR, also titration and viscosity test. The increase in the amount of thermal resistance in comparison with synthesized copolymers compared to PMMA, was investigated by thermal analysis of TGA, DTG and DSC; the results indicated that the thermal resistance of (MMA-MA) compared to PMMA and the thermal resistance of P (MMA-MA) / PhH and P (MMA-MA) / ABA in comparison with the (MMA-MA) has increased. In the following, via electrochemical potentiodynamic polarization tests, EDX and FE-SEM, the effectiveness and inhibition capability of copolymers in hydrochloric acid of 0/5 mol was investigated. Finally, it was proven that copolymers are corrosion inhibitors of synthetic type and have created a protective film on the steel sample and protect against the direct attack of acids on the metal surface. The results indicated that the maximum efficiency related to the inhibitor P (MMA-MA) / ABA that decreased around 93 percent of corrosion process


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