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2021-09-23 - Colloque/Présentation - communication orale - Anglais - 1 page(s)

Nguyen Thi Thao , Arrighi Céline , Thai THU THUY, Trinh Anh Truc, Olivier Marie-Georges , "Incorporation of corrosion inhibitor in a sol-gel coating for corrosion protection of zinc coated steel" in EUROCORR2021, Virtuel (Budapest), Hongrie, 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 coated steel is widely used in construction, infrastructure and the automotive industry as sacrificial coatings. However, to limit its consumption, additional protection is required such as organic coating, corrosion inhibitor or conversn coating. Sol–gel coatings have showed chemical stability and enhanced corrosion resistance for zinc coatings due to the excellent barrier properties. However, it is a matter of fact that the silane sol–gel pre-treatments do not provide an active protection against corrosion processes except for the partial inhibition of the cathodic reaction. Furthermore, the protection offered by the sol-gel films strongly decreases when the coating is damaged. Once electrolyte is penetrated the film, the exposed metal comes into contact with the aggressive environment and corrodes. Thus, it is interesting to find an active compound that can be introduced directly into the coatings to provide an active corrosion protection but keeping the sacrificial protection of Zn layer. In the previous works, cerium salts are proved to be effective inhibitors for the 2024 aluminium alloy (AA2024) [1] and molybdate for the galvanic coupling Zn/Fe [2] The efficiency and the inhibition mechanisms of CeCl3 and Na2MoO4 salts for the corrosion protection of zinc coated steel, were investigated in a neutral solution (NaCl 0.1M). The inhibitor mechanisms were investigated considering the Zn coating and its sacrificial properties in case of scratch. The Organic/Inorganic Hybrid (OIH) coating based on tetraethylorthosilicate (TEOS) and 3-glycidoxypropyltrimethoxysilane (GPTMS) incorporated corrosion inhibitors (Ce3+/ MoO42-) in different concentrations was prepared via the sol-gel method for corrosion protection of zinc coated steel. The main objective is to highlight the role of inhibitor for corrosion resistance of sol-gel coating on this substrate The corrosion protection of galvanized steel coated by sol-gel film was studied by electrochemical measurements (electrochemical impedance spectroscopy (EIS) and polarization curves) coupled with salt spray test. The results showed that the incorporation of Ce3+/ MoO42 improved the protection properties of sol-gel film. The salt spray test confirmed that the Ce3+/ MoO42 incorporated sol-gel coating provided a positive effect on the protection of galvanized steel and the corrosion inhibition.