Protection against corrosion of magnesium alloys with both conversion layer and sol–gel coatingReport as inadecuate




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1 CIRIMAT - Centre interuniversitaire de recherche et d-ingenierie des matériaux

Abstract : The anticorrosion performances of a system consisting of a phosphate based conversion layer and a hybrid sol–gel coating have been evaluated for the magnesium alloy Elektron21. The lone sol–gel coating affords a significant protection of the magnesium substrate. However, the presence of an intermediate conversion layer is presumed to improve the corrosion resistance of the system. The surface morphology of the protection coatings was characterized by optical microscopy, scanning electron microscopy SEM and white-light source interferometry. The corrosion behavior of the systems was analyzed by electrochemical impedance spectroscopy EIS. The impedance measurements show that the presence of the added conversion layer increases the resistance of the whole system during immersion in a 0.05 M NaCl solution, compared to the single sol–gel coating.

Keywords : Magnesium Corrosion Coating Sol–gel Conversion





Author: Noé Verner Murillo-Gutiérrez - Florence Ansart - Jean-Pierre Bonino - Marie-Joëlle Menu - Marie Gressier -

Source: https://hal.archives-ouvertes.fr/



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