Abstract
The microstructures and corrosion behavior of tin thread made in the late Edo period have been investigated. Specimens are obtained from brocades made using the tin thread and from a sample book of tin brocade. Reflectance is measured with a spectrophotometer. Fine structures are observed using a transmission electron microscope. An X-ray diffractometer and X-ray photospectrometer are used to identify corrosive matter. Sn foil glued on Japanese paper shows a brownish black color spectrum. The thickness of the corroded Sn foil is 8∼10 μm. SnO2, SnO, and Sn3O2(OH)2 are detected in the corroded Sn foil. The top layer consists of the most stable SnO2, and there is a SnO layer beneath the SnO2 layer. A Sn3O2(OH)2 layer exists between the SnO layer and the unreacted Sn layer. From these results, corrosion has been promoted in the order of Sn3O2(OH)2, SnO and SnO2.
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