Browsing by Author "Lamaka, S. V."
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- Corrosion protection of AA2024 by sol-gel coatings modified with Ce (III)-enriched ZeolitePublication . Dias, Susana; Lamaka, S. V.; Cunha Diamantino, Teresa; Ferreira, M. G. S.
- Corrosion protection of AA2024 by sol-gel coatings mofidified with mixed Ce(III)-and MoOx-loaded ZeolitesPublication . Dias, Susana; Lamaka, S. V.; Cunha Diamantino, Teresa; Ferreira, M. G. S.
- Revestimentos auto-reparadores de sol-gel dopados com zeólitos permutados com cérioPublication . Dias, Susana; Lamaka, S. V.; Cunha Diamantino, Teresa; Ferreira, M. G. S.
- Synergistic protection against corrosion of AA2024-T3 by sol-gel coating modified with La and Mo-enriched zeolitesPublication . Dias, Susana; Lamaka, S. V.; Cunha Diamantino, Teresa; Ferreira, M. G. S.The present work demonstrates an improvement in corrosion protection of sol-gel coatings modified with a mixture of lanthanum and molybdate-enriched zeolite microparticles (La+Mo) due to synergistic effect between lanthanum and molybdate. The effect of these inhibitor species on protection of AA2024-T3 substrate has been studied by Electrochemical Impedance Spectroscopy and Localized Electrochemical Impedance Spectroscopy. Both techniques revealed an enhanced protection when compared with the case where the inhibitors were used alone. The inhibiting mechanism could involve on demand release of molybdate and lanthanum ions from the loaded zeolite followed by the formation of molybdenum oxide/hydroxide and a Mo-Na-La compound on intermetallic particles.
- The role of Ce(III)-enriched zeolites on the corrosion protection of AA2024-T3Publication . Dias, Susana; Marques, A. G. C.; Lamaka, S. V.; Simões, A.; Cunha Diamantino, Teresa; Ferreira, M. G. S.The present work demonstrates that the addition of Ce-enriched zeolite microparticles to hybrid sol–gel formulation confers protection to the coating. After two weeks of immersion the integrity of sol–gel film remains unchanged. These properties are due to the fact that the Ce(III) loaded zeolite microparticles are released in response to the adsorption of ionic species involved in the corrosion process of AA2024-T3 substrate. Zeolite adsorption of Cu2+ cations from intermetallic dissolution and Cl- anions from the solution is shown to take place, enhancing the protective properties of the coating. The microparticles and coatings characterization were carried out by SEM/EDS and the protection properties of the modified coatings were assessed using EIS and localised electrochemical impedance spectroscopy (LEIS) measurements.