Takekazu Nagae1 and Atsushi Hadano2
1Faculty of Art and Design, University of Toyama, Takaoka 933-8588
The microstructure of a copper bowl excavated from an Edo-period grave in Mukaiyama Ruins in Nara prefecture has been investigated. The sample was subjected to optical microscopy, scanning electron microscopy, electron probe microanalysis and X-ray diffraction analysis to obtain information about the microstructure of both the base metal and the corroded layers. The bowl was made of copper containing 0.9% lead. Annealing twins were observed in the α-Cu phase, which establishes that the bowl was forged and annealed. The corroded layers were composed mainly of cuprite, malachite and copper phosphate. It is thought that the copper phosphate acted as an inhibitor to corrosion.
copper, microstructure, twin, corrosion in soil, excavation, cuprite, malachite, phosphate, inhibitor
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