In this study, to examine synergistic effect of various combinations of the following polymers: PSO-1 (an oligomer phosphinosuccinic in neutralized state) and PMA-M1 (mixture by weight ratio 1/1 from 2-phosphonobutane-1-2, 4 tricarboxilic acid with polymaleic acid) were investigated as corrosion inhibitors for carbon steel of type OL 37, OLC 45 and for copper and brass. Using the microwaves energy, new polymers with antiscaling and anticorrosive properties were synthesized in microwaves field. These new polymers were obtained by radical polymerization of acrylic and/or acrylsulfonate water-soluble monomers in presence of microwaves field chain transfer agents, under the action of peroxidic initiators. The inhibitive properties of these organic compounds were analyzed by electrochemical measurements, FT-IR spectroscopy and by scanning electron microscopy (SEM) of the electrode surface. Also, a variety of short-time corrosion tests on laboratory scale were used to determine the performance and application parameters under different environmental conditions. The metallographic micrographies and scanning electron microscopy made before and after the potentiodynamic polarizations pointed out the evolution of the corrosion process.

The inhibition activity analysis of the organic compounds was made by assuming that, the mechanism of inhibition by organic molecules is chemisorption and that the energetic of the corrosion process per se is unaffected by the addition of substituients on the parent compound. We presume that, these organic compounds inhibit corrosion of these materials by a protective mechanism, forming insoluble complexes and repairing the porous oxide layer. The addition of these new organic polymers offers protection by forming an adsorption organic barrier film at the electrode surface. The corrosion parameters obtained from polarization curves and from EIS spectra are in good concordance and point out the inhibitory action of these new organic polymers.

The addition of the organic inhibitors led in all the cases to inhibition of the corrosion rate. The organic compounds used are adsorbed on the electrode surface according to a Langmuir isotherm. The inhibition process was attributed to the formation of the adsorbed film on the metal surface that protects the metal against corrosive agents. The EIS measurements have confirmed this protection and pointed out the formation of adsorption layers on the electrode surface

The negative value of thermodynamic parameter like Gibbs free energy of adsorption indicates the spontaneity of adsorption process. Moreover, characterization utilizing FT-IR confirms the adsorption of inhibitors and the constitution of corrosion products on the materials surface. EIS and potentiodynamic polarization results demonstrate its corrosion protection capacity