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- Effect of marine microbial activity in corrosion inhibition of 5083 aluminium alloy [Comunicação oral]Publication . Marques, Maria João; Mercier, Dimitri; Seyeux, Antoine; Zanna, Sandrine; Marcus, Philippe; Basseguy, RegineABSTRACT: Microbiologically influenced corrosion inhibition (MICI), can be considered as a new environmentally friendly strategy for corrosion inhibition. Nevertheless, at present, most of the findings in MICI research are obtained under optimized laboratory conditions, generally involving a single microorganism. To upgrade the knowledge in this research field and increase the potential applications, more studies under real conditions are needed, since environmental complexity and biological diversity coexist in field environments impacting the corrosion process of metal surfaces. In this context, one of the main objectives of the MICOATEC project (“New concept of Microbially Inspired anticorrosion coating technology”) is to understand the microbially induced formation of a protective layer on the Al-Mg surface during exposure in marine field. The present work is part of this study.
- Nouveau concept de technologie de revêtement anticorrosion inspirée des systèmes microbiens: Projet MICOATEC [Comunicação oral]Publication . Marques, Maria João; Jaume, Julien; Diderot, Anthony; Délia, Marie-Line; Basseguy, RegineRÉSUMÉ: Parmi les stratégies actuellement utilisées pour protéger les matériaux métalliques de la corrosion, et ainsi accroître leur durabilité, les traitements de conversion et les revêtements peuvent être considérés comme les alternatives les plus efficaces et les plus rentables. Ces techniques doivent cependant respecter une réglementation de plus en plus contraignante telle que REACH. Par ailleurs, dans le domaine des interactions micro-organismes/ matériaux conducteurs, il a été mis en évidence que non seulement les micro-organismes peuvent dans certains cas accélérer la corrosion (biocorrosion ou MIC) et dans d’autres l’inhiber protégeant alors le matériau sous-jacent (MIC Inhibition). Dans ce contexte, le projet ANR MICOATEC repose sur le constat que les interactions entre un alliage d’aluminium (AA 5083) et des microorganismes du milieu marin conduisent à la formation d’une couche protectrice contre la corrosion (Figure 1). MICOATEC ambitionne de développer, via une stratégie biomimétique, un nouveau type de procédé pour produire des revêtements anticorrosion.
- Microbial action as an inspiring tool to propose innovative corrosion protection processes [Comunicação oral]Publication . Basseguy, Regine; Marques, Maria JoãoABSTRACT: Among the strategies employed to protect metallic materials, coatings can be considered as one of the most successful and cost-effective alternatives to increase the service lifetime of metallic structures, particularly in industries that are continuously exposed to changing and hard weather conditions such as shipbuilding, automobile, aerospace, marine and oil & gas energy infrastructures. However, towards a more constraining legislation as REACH, the surface treatment & coating Industry is at the forefront in developing innovative and even more sustainable products.
- Marine micororganisms’action: a hazard that can turn to corrosion protection [Comunicação oral]Publication . Basseguy, Regine; Marques, Maria João
- Influence of natural seawater variables on the corrosion behaviour of aluminium-magnesium alloyPublication . Marques, Maria João; Benedetti, A.; Castelli, F.; Delucchi, Marina; Faimali, Marco; Delsante, S.; Valenza, F.; Garaventa, F.; Pavanello, G.; Basseguy, RegineABSTRACT: Corrosion is an important issue for alloys in natural seawater, where microorganisms can accelerate or mitigate corrosion. Al-Mg alloys are used for marine activities and various associated technologies. Here, the behaviour of AA5083 alloy was investigated in natural seawater with marine exposure lasting up to 50 days and detailing the first 8 days in two experimental series.Experimental work was carried out, including semi-field tests in natural seawater (biotic conditions) compared with abiotic conditions. The open circuit potential (OCP) measurements, during the immersion time, exhibited significantly different behaviours: an OCP downward displacement occurred under abiotic conditions, while, in biotic conditions OCP remained generally stable since the beginning of the immersion, revealing an inhibiting effect of the biological activity on the Al-Mg corrosion. This was accompanied by different surface modifications under biotic conditions: surface and cross-section characterization, performed by scanning electron microscopy with energy dispersive X-ray spectroscopy, showed less corrosion developed on the surface after 8-day immersion and formation of a protective layer during 50-day immersion.The present study shows that marine biological activity positively influences the Al alloy corrosion process, with surface modifications resulting in a protective effect counteracting the aggressiveness of chloride ions.
- 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.
- 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.
- Exploring Marine Biomineralization on the Al-Mg Alloy as a Natural Process for In Situ LDH Growth to Improve Corrosion ResistancePublication . Marques, Maria João; Mercier, Dimitri; Seyeux, Antoine; Zanna, Sandrine; Tenailleau, Christophe; Duployer, Benjamin; Jeannin, Marc; Marcus, Philippe; Basséguy; BASSEGUY, RegineABSTRACT: This study provides a detailed characterization of the AA5083 aluminum alloy, surface, and interface over 6 months of immersion in seawater, employing techniques such as SEM/EDX, GIXRD, mu-Raman and XPS. The purpose was to evaluate the evolution of the biomineralization process that occurs on the Al-Mg alloy. By investigating the specific conditions that favor the in situ growth of layered double hydroxide (LDH) during seawater immersion as a result of biomineralization, this research provides insights into marine biomineralization, highlighting its potential as an innovative and sustainable strategy for corrosion protection.