Layered double hydroxides as containers of inhibitors in organic coatings for corrosion protection of carbon steel

Abstract : The present work focuses on the use of layered double hydroxides (LDH) as containers for corrosion inhibitors in an epoxy coating. 2-Benzothiazolylthio-succinic acid (BTSA), used as corrosion inhibitor, was intercalated by co-precipitation in magnesium-aluminum layered double hydroxides. The obtained LDH-BTSA was characterized by infrared spectroscopy, X-ray diffraction and scanning electron microscopy. BTSA release from LDH-BTSA in NaCl solutions was investigated by UV-vis spectroscopy. The inhibitive action of LDH-BTSA on carbon steel corrosion was characterized by electrochemical methods and the protective properties of an epoxy coating containing LDH-BTSA were evaluated by electrochemical impedance spectroscopy. It was shown that the BTSA was intercalated in the layered double hydroxide and its loading was about 33%. The BTSA release was dependent on the NaCl concentration in the electrolyte. The polarization curves obtained on the carbon steel sample showed that the LDH-BTSA is an anodic inhibitor. Its efficiency was about 90% at a concentration of 3 g/l. The impedance results showed that the incorporation of LDH-BTSA (3%) in the epoxy matrix improved the corrosion protection of the carbon steel.
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Submitted on : Thursday, October 3, 2013 - 10:50:44 AM
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To Thi Xuan Hang, Trinh Anh Truc, Nguyen Thuy Duong, Nadine Pébère, Marie-Georges Olivier. Layered double hydroxides as containers of inhibitors in organic coatings for corrosion protection of carbon steel. Progress in Organic Coatings, Elsevier, 2012, vol. 74, pp. 343-348. ⟨10.1016/j.porgcoat.2011.10.020⟩. ⟨hal-00864273⟩

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