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2021-10-14 - Colloque/Présentation - communication orale - Anglais - 1 page(s)

Olivier Marie-Georges , Arrighi Céline , Nguyen Thi Thao , Paint Yoann, Creus Juan, "Surface and edge corrosion protection of ZnFe coatings applied on steel by pulse electroplating: inhibitive species and sol-gel coatings" in The 8th International Color & Coating congress, Virtuel (Téhéran), Iran, 2021

  • 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) Zinc based sacrificial coatings are currently used to protect steel substrate from corrosion. Eco-friendly and less toxic Zn-Fe alloys are used as a replacement for Zn-Ni coatings (12-15 wt.% Ni). The ennoblement of Zn-Fe (14 wt.% Fe) corrosion potential reduces the galvanic coupling with steel. The mechanisms of two inhibitive species (cerium chloride and sodium molybdate) are determined with electrochemical measurements. Cerium is a corrosion promotor for Zn-Fe (14 wt.% Fe) alloys whereas sodium molybdate increases its corrosion resistance. This species leads to the formation of protective corrosion products on the surface of the alloy. Steel/coating galvanic coupling are studied from two methods: a model extrapolated from the polarization curves and a local electrochemical method (SVET). The second one has highlighted the behaviour of Zn-Fe/steel cross sections in presence of different species. Finally, an aqueous hybrid inorganic/organic sol-gel film was applied on Zn-Fe deposits (14 wt.% Fe). The assessment of the functional properties of the systems reveals an improvement of the corrosion resistance thanks to sol-gel films.