Unique corrosion behavior of an archaeological Roman iron ring: Microchemical characterization and thermodynamic considerations
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1 mai 2024
- handle: 10670/1.vkat86
- hal: hal-04498697
- doi: 10.1016/j.corsci.2024.111946
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info:eu-repo/semantics/altIdentifier/doi/10.1016/j.corsci.2024.111946
Mots-clés
Iron Silver SEM Raman Micro-spectroscopy Corrosion behaviour archaeological corrosion Long-term corrosionSujets proches
Specie Magnetic iron ore Allcharite Xanthosiderite GothiteCiter ce document
Valentina Valbi et al., « Unique corrosion behavior of an archaeological Roman iron ring: Microchemical characterization and thermodynamic considerations », HAL-SHS : archéologie, ID : 10.1016/j.corsci.2024.111946
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Résumé
The corrosion mechanisms of a Roman iron bezel ring were investigated by in-depth characterization of its uncommon corrosion pattern and thermodynamic modelling. A silver foil and altered glass remnants were identified, covered with thick strata of magnetite and goethite. Underneath it, was a multi-millimetric cavity, filled with spheroidal magnetite or magnetite/goethite nodules in a siderite matrix. The bottom of the preserved object showed a marbled corrosion structure composed of goethite, magnetite/maghemite and hematite. Heterogeneous and evolving local conditions, involving synergistic effects of electrolytic and dissolution/precipitation mechanisms might explain the unique morphology and nature of the corrosion products observed.