The inhibition action of some organic polymers on the corrosion carbon steel in acidic media
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ORIGINAL PAPER
The inhibition action of some organic polymers on the corrosion carbon steel in acidic media Florina Branzoi1 · Adriana Băran1 · Aricov Ludmila1 · Elvira Alexandrescu2 Received: 1 April 2020 / Accepted: 3 June 2020 © Institute of Chemistry, Slovak Academy of Sciences 2020
Abstract Corrosion inhibition performance of three sodium polyacrylates polymers was analyzed for carbon steel type OLC 45 in 0.5 M H2SO4 solution. Effectiveness of this polymers were investigated by potentiostatic and potentiodynamic polarization methods, electrochemical impedance spectroscopy (EIS), Fourier transform infrared (FT-IR) spectroscopy, scanning electron microscopy (SEM) and metallurgical microscopy techniques. The polymers involved in this study are three sodium polyacrylates hydrophobically modified with linear and cyclododecyl and, respectively, dihexyl chain (NaPADD, NaPACDD and NaPADH). We assume that, these polymers prevent corrosion of metal electrodes by a protective process can be due to either the adsorption of inhibitor molecules building a protective film or achievement an insoluble complex. Results showed that these polymers accomplished a considerable inhibiting action on OLC 45 corrosion and act that a mixed corrosion inhibitors and it could be proved by the effects of polymers on the electrochemical properties of metal electrodes. The adsorption of the polymers on the electrodes surface obeys to the Langmuir isotherm model. The temperature influence on the corrosion behavior of the metal electrodes in 0.5M H2SO4 with and without the inhibitor at 800 ppm was analyzed in the temperature domain from 293 to 333 K. The negative value of thermodynamic parameter like Gibbs free energy of adsorption shows the spontaneity of adsorption process. The characterization by FT-IR and SEM confirms the adsorption of inhibitors and the formation of corrosion products on the working electrode surface. EIS and potentiodynamic polarization data were indicative its corrosion protection ability. The best inhibition of 97% gets at an inhibitor concentration of 800 ppm for NaPACDD. Keywords Organic inhibitor · Carbon steel · Electrochemical methods · FT-IR spectroscopy · SEM
Introduction The metallic materials are widely utilized in diverse industry applications, such as: chemical processing, petroleum production and refining, technological equipment and marine applications; this improved the exploration in corrosion protection in various aggressive media. Because corrosion is the real element in the degradation of industrial components, numerous tests have been realized to find techniques of * Florina Branzoi [email protected] * Adriana Băran [email protected] 1
Institute of Physical Chemistry, 202 Splaiul Independenţei, Bucharest, Romania
The National Institute for Research and Development in Chemistry and Petrochemistry, 202 Splaiul Independenţei, Bucharest, Romania
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diminishing corrosion and wear costs (Jones 1992; Sastri 2011; Popova et al. 2004; Migahed et al. 2018; Branzoi and Branzoi 2002). Protec
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