广东“南澳Ⅰ号”明代沉船出水铜钱板结物分析研究

Analysis of Two Strings of Copper Coins Salvaged from Nan'ao No.1 Shipwreck of the Ming Dynasty

广东"南澳Ⅰ号"沉船出水的两组铜钱板结物与其余20件铜器相比较,其表面凝结物较少,锈层颜色为鲜艳的蓝绿色,整个器物非常酥松。本文采用X-射线荧光(XRF)、X-射线衍射(X RD)、金相显微镜和扫描电子显微镜/能谱(SEM-EDS)等,分析其组成成分和组织特征,发现这两组铜钱板结物为铜、锡和铅合金,其中铅含量非常高,其基体残留较少,晶界腐蚀比较严重,铅呈颗粒状弥散分布。同时发现氯化物和硫化物,如Cu_(1.92)S和Cu(OH)Cl等。

Two strings of tin-leaded copper coinswere salvaged from the shipwreck- Nan' ao No.1,dated back to the Ming dynasty(A.D.1368-1644),Nan' ao county,Guangdong province.The coins were heavily corroded and incompact with light green blue colour.There is hardly any concretions covering on their surfaces.In this article,X-ray diffraction(XRD),X-ray fluorescence(XRF) and scanning electron microscopy with energydispersive X-ray spectrometry(SEM-EDS) were applied to investigate the composition,structures and surface appearances of these corrosion coins.The Chalcocite,Belloite and Atacamite werealso identified in the corrosion layer.