Hochschularbeit
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| Zusammenfassung: | When ploughing a field at Ballstädt, district Gotha in 2003, several urn-graves located in a level-ground position were damaged by the plough and several parts of vessels and their contents were brought to the surface. After their discovery by honorary officials, the find provided an occasion for an archaeological emergency-excavation. Several urns were retrieved in situ. During the exposure of the find-blocks in the TLDA Weimar, a ceramic urn and a shieldboss were uncovered in one of the blocks. Remarkably, parts of the surface of the iron shield-boss had stayed completely free of conventional rust even after over 2,000 years of being buried in the soil. They had rather formed a kind of passivating surface layer. The aim of this Bachelor-Thesis was to characterise this layer chemically more precisely and to discuss the possible causes of its build-up. In order to analyse the chemical composition of this layer, electron microscopic analysis methods such as energy dispersive X-ray spectroscopy (EDX) and Electron backscatter diffraction (EBSD) were used. This way, a passivation layer of iron oxides lying on the metal core could be detected. Based on these findings, a restoration / conservation concept was developed and implemented. |
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