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  • 1.
    Abi Nassif, L.
    et al.
    University Brest, France; Université Saint Joseph, France.
    Rioual, S.
    University Brest, France.
    Farah, W.
    Université Saint Joseph, France.
    Hellio, C.
    University Brest, France.
    Fauchon, M.
    University Brest, France.
    Trepos, R.
    University Brest, France.
    Abboud, M.
    Université Saint Joseph, France.
    Diler, Erwan
    RISE Research Institutes of Sweden, Materials and Production, Corrosion.
    Thierry, Dominique
    RISE Research Institutes of Sweden, Materials and Production, Corrosion.
    Lescop, B.
    University Brest, France.
    Reduction of potential ennoblement of stainless steel in natural seawater by an ecofriendly biopolymer2020In: Journal of Environmental Chemical Engineering, ISSN 2160-6544, E-ISSN 2213-3437, Vol. 8, no 1, article id 103609Article in journal (Refereed)
    Abstract [en]

    The effect of biofilm formation on passive stainless steel in seawater environments is of primary importance since it leads to potential ennoblement of surfaces and subsequently to localized corrosion such as pitting and crevice corrosion. This study aims at developing an ecofriendly alginate biopolymer containing both non-toxic calcium and a limited amount of biocidal zinc ions which inhibits this effect. For this purpose, calcium alginate containing less than 1 % of zinc ions localized in the vicinity of the steel surface in natural and renewed seawater is demonstrated to reduce significantly the ennoblement process of steel. After 1 month of immersion, a mass loss of only 4 % of the active material is observed authorizing thereby long-term protection of steel in real environment. 

  • 2.
    Thierry, Dominique
    et al.
    RISE Research Institutes of Sweden, Materials and Production, Corrosion.
    Le Bozec, Nathalie
    RISE Research Institutes of Sweden, Materials and Production, Corrosion.
    Persson, Dan
    RISE Research Institutes of Sweden, Materials and Production, Corrosion.
    Corrosion of hot-dip-galvanised steel and zinc alloy-coated steel in ammonia and ammonium chloride2020In: Materials and corrosion - Werkstoffe und Korrosion, ISSN 0947-5117, E-ISSN 1521-4176Article in journal (Refereed)
    Abstract [en]

    There are many potential causes of corrosion in animal buildings. Animals exhale large quantities of moisture into the air creating high relative humidity in the building if the moisture is not properly vented. High humidity increases the potential for condensation. In addition, ammonia may be found in large quantities in animal buildings. Ammonia is released from manure and urine. In addition, ammonium chloride is used as a nitrogen source in fertilisers. In this study, the atmospheric corrosion of hot-dip-galvanised steel and zinc alloy-coated steel such as zinc–aluminium and zinc–aluminium–magnesium has been studied in atmospheres containing different levels of ammonia. Investigations have also been conducted at different levels of ammonium chloride. The results are discussed in view of the mechanisms of corrosion of zinc and zinc alloy-coated steel in ammonia and ammonium chloride-containing environments.

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