四川邛崃一批出土银元的分析与除锈保护

为了保护四川邛崃出土的一批银元,用SEM-EDS和XRD分析法对具有代表性的银元及锈蚀物成分进行了分析。结果显示,银元中除含主元素Ag之外,同时还含有一定量的Cu元素;表面锈蚀物大多数为铜的化合物——氧化亚铜和碱式碳酸铜,少量为角银。结合分析结果及试验,采用机械振动和5%EDTA二钠盐水溶液相结合的方法进行除锈,之后再缓蚀封护,并用有机玻璃制作的钱币专用盒封装存放。分析数据将为研究我国银元文物提供科学信息,保护方法将为银器类文物的保护提供应用实例。

Analysis and protection of a set of silver coins excavated from Qionglai city , Sichuan

The chemical compositions of some representative silver coins and their corrosion products excavated from Qionglai city, Sichuan , were determined using analytical scanning electron microscopy as well as X ~ ray dif- fraction in order to decide how to protect them. The results show that these silver coins contain predominant Ag and reasonable Cu.and their corrosion products mainly contain predominantly Ag and some Cu ,and that their corrosion products are mainly Cu20.CuC03 . Cu( OH)2 and a little AgCl. Accordingly, ultrasonic vibration combined with 5% EDTA was used to remove the corrosion products. The coins were then sealed and packaged into specially made acrylic boxes. The analytical data provide useful information and an example for the preservation of silver cultural relics.