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Report No.
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Inspection about the corrosion of metallic archaeological artifacts in ground (III)

Honda, Takashi*; Yamaguchi, Shingo*

The corrosion behaviors of iron-based archaeological remains, which were dug out in six relics in Aomori-ken and Izumotalsya-keidai-iseki, were analyzed mainly with using X-ray CT. Several samples were cut and investigated on the details of metals and oxide films. The soils were also analyzed on redox-potential, resistance, chemical contents, and others. The results indicate that metal remains in 7/14 samples. The corrosion amounts of objects of Aomori-ken were estimated to be from 1 to 4mm during 400 - 1000 years. The environments were supposed to be oxidizing. On the other hands, it is supposed that two objects in Izumotaisya-keidai-iseki were in a reducing condition. The corrosion amounts were 0.5 - 2 mm. Furthermore, the corrosion behavior of the cast gas-pipe, which had been buried for about 130 years, were evaluated. By analyzing analysis data of soil, the environment is estimated to be weak oxidizing, and the maximum graphitic corrosion depth was about 7mm.

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