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  • 1.
    Becker, Johan
    et al.
    RISE Research Institutes of Sweden, Material och produktion, Korrosion.
    Pellé, J.
    Univ Brest, France.
    Rioual, S.
    Univ Brest, France.
    Lescop, B.
    Univ Brest, France.
    Le Bozec, Nathalie
    RISE Research Institutes of Sweden, Material och produktion, Korrosion.
    Thierry, Dominique
    RISE Research Institutes of Sweden, Material och produktion, Korrosion.
    Atmospheric corrosion of silver, copper and nickel exposed to hydrogen sulphide: a multi-analytical investigation approach2022Inngår i: Corrosion Science, ISSN 0010-938X, E-ISSN 1879-0496, Vol. 209, artikkel-id 110726Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The effect of two concentrations of H2S (0.5 and 2.5 ppm), in controlled laboratory conditions (20 °C, 75%RH), on the atmospheric corrosion of pure Ag, Cu and Ni was investigated in this study. The corrosion product morphology and composition were analysed through a multi-technique approach including SEM/EDX, Raman spectroscopy, XPS and XRD. Different corrosion products were identified depending on the type of characterisations providing a better overview of the effect of H2S on the atmospheric corrosion of pure Ag, Cu and Ni. Possible mechanisms involved in the formation of these corrosion products are also discussed in this work. © 2022 The Authors

  • 2.
    Diler, Erwan
    et al.
    RISE Research Institutes of Sweden, Material och produktion, Korrosion.
    Peltier, Fabienne
    RISE Research Institutes of Sweden, Material och produktion, Korrosion.
    Becker, Johan
    RISE Research Institutes of Sweden, Material och produktion, Korrosion.
    Thierry, Dominique
    RISE Research Institutes of Sweden, Material och produktion, Korrosion.
    Real-time corrosion monitoring of aluminium alloys under chloride-contaminated atmospheric conditions2021Inngår i: Materials and corrosion - Werkstoffe und Korrosion, ISSN 0947-5117, E-ISSN 1521-4176, Vol. 72, nr 8, s. 1377-1387Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    In this study, the use of electrical resistance (ER) sensors to monitor the corrosion of Al94Cu6 alloy is assessed and compared with 2024-T3 coupons. Under uniform corrosion, a good correlation was found between the ER sensors and mass loss on coupons. Three different chloride depositions are studied: (i) pre-contamination with dry/wet cycles, (ii) Volvo standard accelerated corrosion test and (iii) neutral salt spray test. The obtained results show good reproducibility of the ER sensors under all tested conditions. This suggests that ER sensors more levelled the effect of localised corrosion through a large surface evaluation compared with cross-sections. The corrosion thickness obtained with the ER sensors does not correspond to the mean depth obtained by cross-sections. This can be explained by the distribution and size of the localised corrosion events according to a finite element model proposed. The ER method allows obtaining useful real-time corrosion data for the understanding of the corrosion mechanisms and the development of accelerated tests. The chloride concentration, the frequency of salt application and wet/dry cycles have a strong influence on the corrosion rate of aluminium alloys. © 2021 The Authors. 

  • 3.
    El Masri, I.
    et al.
    Univ Brest, France.
    Lescop, B.
    Univ Brest, France.
    Talbot, P.
    Univ Brest, France.
    Vien, G. N.
    Univ Brest, France.
    Becker, Johan
    RISE Research Institutes of Sweden, Material och produktion, Korrosion.
    Thierry, Dominique
    RISE Research Institutes of Sweden, Material och produktion, Korrosion.
    Rioual, S.
    Univ Brest, France.
    Development of a RFID sensitive tag dedicated to the monitoring of the environmental corrosiveness for indoor applications2020Inngår i: Sensors and actuators. B, Chemical, ISSN 0925-4005, E-ISSN 1873-3077, Vol. 322, artikkel-id 128602Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The environmental corrosiveness is governed for indoor applications by the presence of gaseous pollutants in air and levels of temperature and relative humidity. Its determination is a challenging task and requires the monitoring of thickness reduction of selected metals in the range of few tens of nanometers. The present work aims at developing an UHF RFID (Ultra High Frequency Radio Frequency Identification) sensor dedicated to such measurements. The sensor is based on the coupling between the antenna of a commercial RFID tag and a thin layer of copper exposed to the environment. The ability of the proposed sensor to be sensitive to a variation of the metal thickness in the range of tens of nanometers is demonstrated experimentally through exposure tests in a climatic chamber. The results are supported by electromagnetic simulations performed in the case of a coupling between a dipolar antenna and a thin metallic layer.

  • 4.
    Rioual, Stephane
    et al.
    Univ Brest, France.
    Lescop, Benoit
    Univ Brest, France.
    Pellé, Juien
    Univ Brest, France.
    de Alkmim Radicchi, Gerusa
    ARC-Nucléart, France.
    Chaumat, Gilles
    ARC-Nucléart, France.
    Bruni, MD
    ARC-Nucléart, France.
    Becker, Johan
    RISE Research Institutes of Sweden, Material och produktion, Korrosion.
    Thierry, Dominique
    RISE Research Institutes of Sweden, Material och produktion, Korrosion.
    Development of low-cost RFID sensors dedicated to air pollution monitoring for preventive conservation2022Inngår i: Heritage Science, E-ISSN 2050-7445, Vol. 10, nr 1, artikkel-id 124Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Monitoring of atmospheric pollutants is a key point for preventive conservation since these species are known to impact the integrity of many artifacts including metals, papers, pigment and textiles. The problem can be amplified in closed environments, like in exhibition rooms and showcases, where temperature and relative humidity gradients and levels can introduce additional micro-climatic problems. One objective of the EU-SensMat project concerns the development of low cost and low visual nuisance sensors sensitive to these pollutants, making them affordable for all museums including small ones. For this purpose, the Radio-Frequency Identification (RFID) technology was considered to produce air-quality sensors based on reactive metallic dosimeter. Besides the low cost, they can be easily integrated to other existing RFID applications such as identification tasks since the interrogation is made with a commercial UHF-RFID reader. The description and the main features of these sensors are discussed in this paper. Moreover, as it will be shown, the subsequent chemical analysis of the sensitive part of the sensors provide useful information to determine the origin of the pollutants. © 2022, The Author(s).

  • 5.
    Rioual, Stephane
    et al.
    University Brest, France.
    Lescop, Benoit
    University Brest, France.
    Pellé, Julien
    University Brest, France.
    Radicchi, Gerusa
    ARC-Nucléart, France.
    Chaumat, Gilles
    ARC-Nucléart, France.
    Bruni, Marie
    ARC-Nucléart, France.
    Becker, Johan
    RISE Research Institutes of Sweden, Material och produktion, Korrosion.
    Thierry, Dominique
    RISE Research Institutes of Sweden, Material och produktion, Korrosion.
    Monitoring of the environmental corrosivity in museums by rfid sensors: Application to pollution emitted by archeological woods2021Inngår i: Sustainability, E-ISSN 2071-1050, Vol. 13, nr 11, artikkel-id 6158Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The control of air quality in museums or storages is of fundamental interest for the conservation of historic artifacts. The present work reports an example of application of RFID sensors developed in the European project SensMat and dedicated to this issue. The sensors are based on the variation of property of an RFID tag coupled with a sensitive silver thin film exposed to the environment. As it will be described in the paper, such low-cost sensors are interrogated by a commercial reader and provide the environmental corrosivity index and thus the presence of pollutants. The selected case study concerns the monitoring of pollution by H2S in a building dedicated to conservation and restoration of archeological and historical woods. The ability of sensors to map spatially the corrosivity within buildings is highlighted. © 2021 by the authors. 

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