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2018-09-13 - Colloque/Présentation - communication orale - Anglais - 1 page(s)

Rodriguez Justine , Bollen Estelle, Nguyen Thuy Duong, Paint Yoann, Olivier Marie-Georges , "Study of the efficiency of hydrotalcite modified with benzotriazole for the corrosion protection of Zn-Mg coated steel" in Eurocorr 2018, Krakow, Pologne, 2018

  • Codes CREF : 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)
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Abstract(s) :

(Anglais) Study of the efficiency of hydrotalcite modified with benzotriazole for the corrosion protection of Zn-Mg coated steel J. Rodrigueza, E. Bollena, D. T. Nguyena,b, Y. Paintc, M.-G. Oliviera,c a Faculté Polytechnique, Université de Mons, Rue de l’Epargne, 56, 7000 Mons, Belgium b Institute for Tropical Technology, Vietnam Academy of Science and Technology, Vietnam c Materia Nova ASBL, Avenue Copernic, 1, 7000 Mons, Belgium Zinc coated steel is largely used in wide range of industries such as automotive, construction or household appliances due to its high corrosion resistance. However, the sensitivity of zinc to aggressive environments, the intensive consumption of zinc and the increase in coating price are so many factors that are limiting the use of zinc coatings. New coatings formulations applied on steel have consequently been developed for many years in order to reduce the consumption of zinc and its cost in coatings. Several studies have shown that the addition of magnesium into the metallic coating allows to improve corrosion resistance in atmospheric conditions without increasing coating thickness. However the Zn-Mg coatings applied on steel remain critically reactive in immersion in aggressive environments due to a high dissolution rate of magnesium1. Benzotriazole (BTAH) has recently been proved to be efficient for the corrosion inhibition of Zn-Mg coated steel2. The present work aims at investigating the efficiency of hydrotalcite modified with benzotriazole (LDH-BTAH) for the corrosion protection of Zn-Mg coated steel in chloride electrolyte. The layered double hydroxide was synthetized by coprecipitation method and was characterized by means of infrared spectroscopy and X-ray diffraction. BTAH release from LDH-BTAH was investigated using UV-vis spectroscopy and its inhibitive effect analysed by electrochemical impedance spectroscopy. Epoxy coating doped with LDH-BTAH was applied on the Zn-Mg coated steel surface and the efficiency of the coating was assessed using salt spray test and EIS measurements. 1 J. Rodriguez, L. Chenoy, A. Roobroeck, S. Godet, M.-G. Olivier, Effect of the electrolyte pH on the corrosion mechanisms of Zn-Mg coated steel, Corrosion Science 108 (2016) 42-59 2 J. Rodriguez, M. Mouanga, A. Roobroeck, D. Cossement, A. Mirisola, M.-G. Olivier, Study of the inhibition ability of benzotriazole on the Zn-Mg coated steel corrosion in chloride electrolyte, 2017, https://doi.org/10.1016/j.corsci.2017.12.025