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Investigation of the altered layer on ancient Chinese bronze mirrors and model high-tin bronzes

机译:中国古代铜镜和模型高锡青铜器改层的调查

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Many ancient Chinese bronze mirrors have a smooth patina. An ingress of corrosion to a depth of approximately 100 (mu)m is found beneath the patina. The corrosion selectively replaces the Cu-rich (alpha) phase leaving the Sn-rich (delta) phase intact. Previous work by x-ray diffraction has shown that the (alpha)-phase replacement product is poorly crystallized or nanocrystalline SnO(sub 2). Transmission electron microscopy was employed to further characterize the replacement product in both ancient mirror and replication samples. Nanocrystalline SnO(sub 2) in the form of small spheroids has been found. Remnants of an original alloy phase appear to be interspersed with the tin oxide.

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