一青铜耳杯锈蚀的拉曼光谱分析

摘要

利用超景深显微镜和激光共聚焦显微拉曼光谱仪,对重庆市云阳县丝栗包遗址出土的一件青铜耳杯的锈蚀产物进行分析.通过分析可知,该耳杯的锈蚀物主要有:磷氯铅矿(Pb5(PO4)3Cl)、白铅矿(PbCO3)、氧化铅(PbO)、赤铜矿(Cu2O)、孔雀石(Cu2CO3(OH)2)和蓝铜矿(Cu3(CO3)2(OH)2).铅的腐蚀产物由内向外的分布为氧化铅、白铅矿和磷氯铅矿.据此推断锈蚀外层磷氯铅矿的形成过程可能为:铅氧化成氧化铅,之后转换成白铅矿,白铅矿在酸性、富含磷和氯的环境下转变成化学性质稳定的磷氯铅矿.%The corrosion products grown on the bronze earcup unearthed at Silibao site,Yunyang county,Chongqing were investigated by microscope and identified by Raman spectroscopy.The results are as follows:The corrosion products grown on the earcup are pyromorphite(lead phosphate chloride,Pb5(PO4)3Cl),cerussite(PbCO3),lead oxide(PbO),cuprite(Cu2O),malachite(Cu2CO3(OH)2)and azurite(Cu3(CO3)2(OH)2).And the corrosion products of lead from inner to outer are:lead oxide,cerussite and pyromorphite.It can be deduced through analysis that pyromorphite in the out layer of the patina was formed through the process Pb→PbO→PbCO3→Pb5(PO4)3Cl.Cerussite will transfer to pyromorphite when in the enviroment with ambient PH,higher phosphate levels and chloride.