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2017-09-05 - Colloque/Présentation - communication orale - Anglais - 1 page(s)

Nguyen Thuy Duong, To Thi Xuan Hang, Yoann Paint, Gervasi Julien , Gonon Maurice , Olivier Marie-Georges , "Corrosion inhibition of carbon steel by hydrotalcites modified with different organic inhibitors studied in chloride neutral solution" in EUROCORR2017, Pragues, République tchèque, 2017

  • Codes CREF : Enseignement des sciences de l'ingénieur (DI0132), Corrosion des matériaux (DI2114)
  • Unités de recherche UMONS : Science des Matériaux (F502)
  • Instituts UMONS : Institut de Recherche en Science et Ingénierie des Matériaux (Matériaux)
  • Centres UMONS : Ingénierie des matériaux (CRIM)

Abstract(s) :

(Anglais) Hydrotalcites intercalated with different organic corrosion inhibitors (2-benzothiazolythio-succinic acid (HT-BTSA), benzoate (HT-BZ), sebacate (HT-SB) respectively) were prepared by a coprecipitation method. The synthesized hydrotalcites have been characterized using infrared spectroscopy (FT-IR), X-ray diffraction (XRD), transmission electron microscopy (TEM) and zeta potential measurements. The inhibitor release from hydrotalcites in a chloride solution has been determined by UV-Vis spectroscopy and TOC analysis. The inhibitive action of conditioned hydrotalcites on carbon steel has been evaluated using electrochemical measurements and by SEM/EDX analysis. The results showed that the release of corrosion inhibitors from modified hydrotalcites depends on their structure and on the chemical functions of inhibitors. The nature of the interaction between hydrotalcite and the organic inhibitor and its strength modifies their zeta potential in aqueous solutions. The polarization curves have shown that HT-BTSA, HT-BZ and HT-SB behave as anodic corrosion inhibitors. Their inhibition efficiencies at a concentration of 3 g/l were 92 %, 81 % and 94 %, respectively. These efficiencies are higher than those measured for the organic inhibitors in chloride solutions highlighting a synergistic effect due to the combination of the nanoparticules and carboxylate inhibitors. The inhibition effect of modified hydrotalcite depends not only on the intercalated organic inhibitors but also on the capability of adsorption of the hydrotalcite structure on a steel surface. Out of the three synthesized hydrotalcites, HT-SB gives the highest corrosion efficiency. These modified hydrotalcites can be used as pretreatment or added in organic coatings to give self-healing properties.