Corrosion Science and Technology

The Corrosion Science Society of Korea (한국부식방식학회)
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Detection of Iron Phases Presents in Archaeological Artifacts by Raman Spectroscopy

  • Barbosa, A.L. (University of Cartagena, Science Faculty, Chemistry Department, Laboratory of Catalysis research and New materials, LICATUC, Pharmacy Building, Campus de Zaragocilla) ;
  • Jimenez, C. (University of Cartagena, Science Faculty, Chemistry Department, Laboratory of Catalysis research and New materials, LICATUC, Pharmacy Building, Campus de Zaragocilla) ;
  • Mosquera, J.A. (University of Cartagena, Science Faculty, Chemistry Department, Laboratory of Catalysis research and New materials, LICATUC, Pharmacy Building, Campus de Zaragocilla)
  • Received : 2017.09.08
  • Accepted : 2018.04.18
  • Published : 2018.04.30
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Abstract

The compounds associated with corrosion, in metallic archaeological samples of carbon steel of insular origin were evaluated to establish their degree of deterioration and structural damage against air pollution. The iron phases present in samples of archaeological artifacts were detected by Raman spectroscopy and confocal Raman microcopy. These samples mainly exhibited ing mainly ${\beta}$-FeO(OH) type goethite oxyhydroxides and small amounts of akaganeite ${\alpha}$-FeO(OH) lepidocrocite ${\gamma}$-FeO(OH) due to dominant chloride in a marine environment and non-stoichiometric oxyhydroxides Fe (II + / III +) as indicators of early corrosion. Some parts showed the presence of magnetic maghemite indicating high corrosion. ${\gamma}$-FeO(OH) is a precursor of phases associated with advanced marine corrosion. By studying its decomposition by Raman spectroscopy, it was synthesized with the following sequence: ${\gamma}-FeO(OH){\rightarrow}{\alpha}-FeO(OH)+{\gamma}-FeO(OH)$, ${\rightarrow}{\gamma}-Fe_2O_3+Fe_3O_4$. Ferric compounds provided evidence for the effect of intensity of laser on them, constituting a very useful input for the characterization of oxidation of iron in this type of artifacts. Thus, destructive analysis techniques should be avoided in addition to the use of small amounts of specimen.

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