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2019-05-27 - Article/Dans un journal avec peer-review - Anglais - 10 page(s)

Pezzato Luca, Bertolucci Coelho Leonardo , Bertolini Rachele, Settimi Alessio Giorgio, Brunelli Katya, Olivier Marie-Georges , Dabalà Manuele, "Corrosion and mechanical properties of plasma electrolytic oxidation‐coated AZ80 magnesium alloy" in Materials and Corrosion, 70, 11, 2103-2112, 10.1002/maco.201910847

  • Edition : Wiley-VCH, Weinheim (Germany)
  • 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)
Texte intégral :

Abstract(s) :

(Anglais) Plasma electrolytic oxidation (PEO) coatings were produced on AZ80 magnesium alloy in a solution containing silicates and phosphates and working at high current densities with short treatment times. The effect of a sealing treatment in boiling water on corrosion and mechanical properties of the coatings were investigated. Moreover, the corrosion mechanism of the samples with and without the sealing treatment was evaluated. The microstructure of the coatings was characterized with scanning electron microscope observation and X‐ray diffraction analysis. The mechanical properties were evaluated with nanoindentation tests and the corrosion resistance was studied by potentiodynamic polarization, electrochemical impedance spectroscopy, and scanning vibrating electrode technique. The results showed that the sealing did not influence the microstructure and the mechanical properties of the samples and instead produced a remarkable increase in the corrosion resistance. The crevice corrosion, present in the sample without the sealing, was avoided with the treatment in boiling water.