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Article Dans Une Revue Progress in Organic Coatings Année : 2012

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

Résumé

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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Dates et versions

hal-00864273 , version 1 (03-10-2013)

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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, 2012, vol. 74, pp. 343-348. ⟨10.1016/j.porgcoat.2011.10.020⟩. ⟨hal-00864273⟩
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