Percorrer por autor "Basseguy, Regine"
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- Aluminium en milieu marin : protection par la biocorrosion [Resumo]Publication . Jaume, Julien; Basseguy, Regine; Marques, Maria João; Délia, Marie-LineABSTRACT: Pour être utilisés en milieu marin, les matériaux doivent être particulièrement résistant à la corrosion, du fait de la composition chimique de l’eau de mer (concentration en chlorure élévée, …) mais également de la présence des microorganismes. En effet, les microorganismes sont connus pour catalyser la corrosion ou l’inhiber [1,2]. Ces phénomènes antagonistes sont regroupés sous le terme de « Microbiologically Influenced Corrosion » (MIC) et « MIC Inhibition » (MICI). Les alliages d’aluminium Al-Mg, série 5000 qui présentent une bonne résistance mécanique mais également à la corrosion, sont un matériau de choix pour les structures immergées dans l’eau de mer.
- Atmospheric Corrosion Resistance of Marine Biomineralized Layers on Aluminium – Magnesium Alloy [Comunicação oral]Publication . Marques, Maria João; Mercier, Dimitri; Seyeux, Antoine; Zanna, Sandrine; Marcus, Philippe; Basseguy, RegineABSTRACT: Developing solutions to improve the durability of materials remains a key challenge in surface science, especially for aluminium and aluminium alloys. In this context, marine biomineralization processes have been shown to offer potential as a novel approach for developing more sustainable corrosion protection solutions [1,2]. These solutions are based on the spontaneous formation of biomineralized layers, which exhibit a hybrid inorganic-organic nature and are capable of mitigating the corrosion of aluminium alloys, specifically Al-Mg alloys [3,4]. The present study investigates the corrosion resistance, under natural atmospheric exposure conditions, of marine biomineralized layers formed on Al-Mg surfaces. More specifically, the evaluation tests were carried out at an outdoor marine/industrial test site (Sines, Portugal). Morphological and chemical characterizations were performed before and after the exposure, mainly by SEM/EDX and XPS, enabling the assessment of the Al-Mg surface modifications and the impact of the natural atmospheric corrosion test on the biomineralized layer.
- 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.
- 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.
- 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
- Interactions between marine microorganisms and metal: the start point of a new bioinspired solution for corrosion protectionPublication . Marques, Maria João; Jaume, Julien; Diderot, Anthony; Délia, Marie-Line; Basseguy, RegineABSTRACT: Among the strategies currently used to protect metallic materials from corrosion, and thus increase their durability, conversion treatments and coatings can be considered as the most efficient and cost-effective alternatives. However, these techniques must comply with increasingly stringent regulations such as REACH. On another note, in the field of interactions between microorganisms and conductive material, it has been shown that microorganisms can not only accelerate corrosion in some cases (biocorrosion or MIC) but also inhibit it in others, thus protecting the underlying material (MIC Inhibition). In this context, the MICOATEC ANR project is based on the observation that interactions between an aluminium alloy (AA5083) and microorganisms in the marine environment lead to the formation of a protective layer against corrosion. The MICOATEC project aims to develop, via a biomimetic strategy, a new type of process for producing anti-corrosion coatings. The main goal is therefore to translate the natural biotic process into an abiotic technological process for corrosion protection, without replicating the biofilm itself or incorporating active biocompounds into the coating matrix.
- Marine biomineralization as MICI process. A basis for new anticorrosion surface treatments [Comunicação oral]Publication . Marques, Maria João; Zanna, Sandrine; Marcus, Philippe; Basseguy, RegineABSTRACT: The development of sustainable corrosion protection strategies is a major challenge in materials engineering, particularly for metallic structures exposed to marine environments. While microorganisms are traditionally regarded as contributors to corrosion processes, their potential role in Microbiologically Influenced Corrosion Inhibition (MICI) remains largely underexplored. The objective of this presentation is to highlight the potential of MICI mechanisms as a novel pathway for corrosion protection solutions, with particular emphasis on biomineralization processes.
- Marine biomineralization for enhanced corrosion resistance: Insights from the ANR MICOATEC project [Poster]Publication . Marques, Maria João; Nkoua, C.; Jaume, Julien; Diderot, Anthony; Mercier, Dimitri; Seyeux, Antoine; Délia, Marie-Line; Silva, S. da; Fori, B.; Blanc, C.; Zanna, Sandrine; Marcus, Philippe; Basseguy, RegineABSTRACT: Concerns about marine pollution and ecological threats caused by traditional corrosion protection technologies have driven the development of new environmentally friendly anti-corrosion solutions. In recent years, it became clear that microorganisms have the potential to positively impact corrosion behavior, a phenomenon known as MICI (microbiologically influenced corrosion inhibition) [1,2]. Although research on MICI mechanisms is still in the beginning, two main mechanisms have been outlined: direct and indirect inhibition. In the first one, the microorganisms are responsible for the segregation of slow-release inhibitors or surfactants or consume oxygen, which affects the cathodic reaction process. The second one, indirect inhibition mechanism, is associated to the formation of a protective layer on the surface of the material due to metabolic activity of microorganisms. In this context, biomineralization attracted the attention of researchers as a solution to inhibit metal corrosion.
- Marine micororganisms’action: a hazard that can turn to corrosion protection [Comunicação oral]Publication . Basseguy, Regine; Marques, Maria João
- Marine Microbial Induced Mineralization: Exploring Mechanisms for Bioinspired Anticorrosion solutionsPublication . Marques, Maria João; Zanna, Sandrine; Marcus, Philippe; Basseguy, RegineABSTRACT: In the field of corrosion, nature has proved to be a source of inspiration for developing new green protection concepts. Over the last decades, new emerging microbial-based technologies have been studied, based on the recognition that microorganisms can influence corrosion behaviour in an advantageous way, the so-called MICI (microbiologically influenced corrosion inhibition), opening different lines of research (1-5). In particular, the process of biomineralisation on the surface of materials was recently highlighted as a promising new environmentally-friendly approach to produce protective coatings.