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2018-02-09 - Colloque/Présentation - communication orale - Anglais - 1 page(s)

Rodriguez Justine , Olivier Marie-Georges , Mouanga Maixent, "Study of the corrosion mechanisms and protection of Zn-Mg coated steel" in 69th Annual Meeting of the International Society of Electrochemistry, Bologne, Italie, 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)

Abstract(s) :

(Anglais) Corrosion mechanisms and inhibition protection of Zn-Mg coated steel M.-G. Oliviera,b , J. Rodrigueza a Faculté Polytechnique, Université de Mons, Rue de l’Epargne, 56, 7000 Mons, Belgium b Materia Nova ASBL, Avenue Copernic, 1, 7000 Mons, Belgium marjorie.olivier@umons.ac.be Justine.rodriguez@umons.ac.be Thanks to its high corrosion resistance, zinc coated steel is largely used in wide range of industries such as automotive, construction or household appliances. 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. A large number of new coated steel formulations have consequently been studied for many years in order to reduce the consumption of zinc and its cost in coatings. Number of studies have shown that the addition of magnesium into the metallic coating allows to improve corrosion resistance in atmospheric conditions without increasing thickness. However, there is a lack of information about the behavior of Zn-Mg coatings in immersion, namely in the case of water retention inside hollow bodies. Furthermore, the high dissolution rate of magnesium due to its high electronegativity is an important parameter that critically affects the corrosion mechanism of the coating. Thus, the study focused on the in-depth understanding of the dissolution process, in order to develop an anti-corrosion system considering the complex behavior of the substrate. Three axes were developed in order to achieve this aim. On a first part, the surface dissolution and the sacrificial protection mechanism were studied at both global and local scales1. On a second part, the efficiency of corrosion inhibitors was investigated by means of electrochemical and analytical measurements in order to reduce the dissolution rate of the substrate in immersion conditions. Benzotriazole (BTAH) was found to be the most effective molecule and its inhibition mechanism in chloride solution was analysed in details2. On a last part, the incorporation of BTAH in layer double hydroxide (LDH) containers with the aim of doping epoxy resin was discussed. Keywords: metal coatings, magnesium, corrosion inhibition [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) 47-59 [2] J. Rodriguez, M. Mouanga, A. Roobroeck, D. Cossement, M.-G. Olivier, “Study of the inhibition ability of benzotriazole on the Zn-Mg coated steel corrosion in chloride electrolyte”, Corrosion Science, 132 (2018), 56-67