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Browsing ME - Resumos em livros de actas by Subject "Aluminium alloys"
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- AA 5083 aluminium alloy corrosion in estuarine environmentPublication . Marques, Maria João; Alves, Isabel Nascimento; Gonçalves, Rita
- Enhancing Corrosion Resistance of Al-Mg Alloys through Biomineralization [Resumo]Publication . Marques, Maria João; Fori, Benoit; Mercier, Dimitri; Seyeux, Antoine; Zanna, Sandrine; Marcus, Philippe; BASSEGUY, RegineABSTRACT: In recent decades, new emerging microbiological technologies have been studied, based on the recognition that microorganisms can inhibit corrosion by different mechanisms, the so-called MICI (microbiologically influenced corrosion inhibition), opening up different lines of research. In this context, biomineralization has been attracting the attention of researchers, with an increasing number of studies showing that different types of mineralized layers formed on metal surfaces can reduce the risk of corrosion.
- Influence of the initial surface roughness of aluminum alloy 5083 on surface modifications in presence of marine microorganisms [Resumo]Publication . Jaume, Julien; Marques, Maria João; Délia, Marie-Line; Basseguy, Regine
- La biominéralisation comme bioinspiration pour le développement de solutions anti-corrosion [Resumo]Publication . BASSEGUY, Regine; Marques, Maria JoãoRÉSUMÉ: Dans le domaine de la corrosion, la nature se révèle être une source d’inspiration pour développer de nouveaux concepts de protection verts. En effet, il est largement reconnu que les micro-organismes sont capables non seulement d’accélérer la orrosion mais ils peuvent également l'inhiber et/ou protéger les matériaux qu’ils colonisent [1]. Ce constat a ainsi conduit à proposer des stratégies à base microbienne pour l'inhibition de la corrosion des métaux. En particulier, le processus de biominéralisation à la surface des matériaux, tels que les pierres, le béton et divers métaux, a récemment été considéré comme une nouvelle approche respectueuse de l'environnement pour produire des couches protectrices [2-3]. Jusqu’à peu, la majorité des publications concernaient les aciers, matériaux historiquement utilisés dans les infrastructures. Au cours des dernières années, de nouveaux matériaux tels que les alliages d'aluminium, sont apparus sur le marché comme des alternatives possibles. Dans le cas spécifique de l'alliage Al-Mg, souvent utilisé dans les applications marines, peu d'études ont évalué l'influence de la biominéralisation sur la corrosion [4-6]. L'objectif de cette présentation est de montrer, à travers deux études de cas, comment la précipitation minérale influencée par l’activité microbienne sur les matériaux métalliques peut être envisagée comme une nouvelle approche pour le développement de solutions anti-corrosion.
- Layered double hydroxides for aluminium alloys corrosion resistancePublication . Rangel, C. M.; Travassos, Maria AntóniaLayered Double Hydroxides (LDHμs), represented by the general formula [MII (1-x)MIIIx(OH)2[An-x/n].zH2O or [MIMIII2(OH)6[An-1/n].zH2O], where MI, MII, MIII are mono-, di- and tri-valent metal cations, are being researched as anion-exchange materials with interesting intercalation chemistry that accommodate a wide range of applications including corrosion resistance. In this work, layered double hydroxides containing a monovalent (Li+) and trivalent (Al3+) matrix cations, have been synthesized and characterised using X-ray diffraction, FTIR and SEM. LDHμs were prepared by a simple co-precipitation method using metal hydroxides and metal salts in an alkaline solution. Formation of LDHμs on the metal surface of Al alloys were attempted with excellent results. Pitting corrosion was inhibited on Aluminium 2024-T3 with an extensive capability to withstand the presence of high concentrations of chloride ions. The formation of DHLμs is thought to be responsible for inhibition which is demonstrated to be under diffusion control. The action of DLHμs on copper is demonstrated in separated experiments using pure copper samples in similar experimental conditions as for the alloy, in an extensive
- The corrosion behavior of aluminium-magnesium alloy in natural seawater: effects of the biological activity [Resumo]Publication . Marques, Maria João; Benedetti, A.; Castelli, F.; Delucchi, Marina; Faimali, Marco; Delsante, S.; Valenza, F.; Garaventa, F.; Pavanello, G.; Losurdo, M.; Basseguy, RegineABSTRACT: Concerning the corrosion in seawater environments, microorganisms can cause corrosion (Microbiologically Influenced Corrosion - MIC) [1], but also inhibit it or protect against it, a process known as MIC Inhibition (MICI) [2-3]. Corrosion studies of Al-Mg alloys of the 5XXX series, widely used in the shipbuilding industry, requires wider comprehension regarding the impact of the microbial activity [4-7]. Recent studies indicate that the biological activity tends to mitigate the Al alloy corrosion processes [8-11]. The objective of the present study is to assess the influence of natural seawater and the related biological activity on the resistance of the AA5083 Al-Mg alloy by the means of immersion experiments in natural (biotic) vs control (abiotic) seawater. Ennoblement of the open circuit potential (OCP) on Stainless steel (SS) probes was used to monitor the biofilm growth [12].