Yujiaba site is one of the most important Ba sites in the Three Gorges area.It is located at the northeast of Yujiaba,Kaizhou Disctrict,Chongqing and was discovered in 1980s.Burial objects characterized by bronze weapons have been unearthed after four excavations.This article applies non-destructive analysis with high-fidelity optical microscope and Raman spectroscope to observe the appearance and explore the structure of corrosion products on 10 bronze swords excavated from Yujiaba site.The result shows that the bronze swords can be classified into two categories:one with category with smooth and compact surfaces,the corrosion products of which are malachite,cassiterite and cuprite,the other one contains corrosion products,namingly malachite(Cu2CO3(OH)2),azurite(Cu3(CO3)2(OH)2),cuprite (Cu2O),cerussite (PbCO3),pyromorphite (Pb5(PO4)3Cl),mimetite (Pb5(AsO4)3Cl),brochantite (Cu4SO4(OH)6),cassiterit e(SnO2)and atacamite (Cu2Cl(OH)3).In addition,this article analyzes the cause of corrosion and tries to provide evidence for further conservation and restoration of those cultural relics and related research on corrosion of Ba bronze weapons.
Key words
Yujiaba site /
corrosion products /
non-destructive analysis /
bronze swords
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