Abstract
In this work, an expedient and good yielding prepared tactic for production of polythiazoles offered through treatment of bis-hydrazonoyl halides with bis (hydrazinecarbothioamide). The description scheme for the final polymers is proposed and discussed. Organic substances of the final products were clarified by spectral data. The prepared polythiazoles compounds were examined as corrosion inhibitors for M-steel in 2.0 N HCl solutions. The corrosion inhibition performance was determined by electrochemical techniques including open circuit potential (OCP), electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization (PDP) measurements. The obtained outcomes showed that such two polymer inhibitors could effectively inhibit the corrosion of M-steel of in the studied media, especially at their low concentrations; the inhibition capacity was increased from 55.8% in the presence of 10 ppm–98.8% in the presence of 100 ppm. Moreover, para-substituted polymer showed higher inhibition capacity than the corresponding meta-substituted polymer. SEM observations demonstrated the formation of a protective inhibitor layer on the M-steel surface. Additionally, the adsorption of the polymer molecules on the surface of M-steel was found to obey the Langmuir isotherm model.
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•Two Novel polythiazoles compounds have been synthesized.•The description scheme for the final polymers is proposed and discussed.•The prepared polythiazoles were examined as corrosion inhibitors for steel in HCl.•The adsorption model obeys to the Langmuir isotherm.•SEM analysis indicates the formation of a protective inhibitor film on the metal surface.