A Establishment and Evaluation of a Conservation Treatment for Old Coins Attacked with Bronze Disease, mainly caused by Atacamite.

针对主要由氯铜矿引起的青铜病害的古钱币的保护处理方法的建立和评价。

• 批准号: 06801048
• 负责人: TAKEDA Akiko
• 金额: $ 0.77万
• 依托单位: SHOWA WOMEN'S UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1994
• 资助国家: 日本
• 起止时间: 1994 至 1995
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-06801048/
• 关键词: Islamic old coins; Bronze disease; Atacamite; Chemical treatment; Chelating agents; Effects of desalting and stabilization; Evaluation method for conservation treatment; Conservation treatment at the findspot; 保存処理; 腐食生成物; 塩素; クリーニング法; 錆; クリー

1. Analysis of corrosion products on excavated old Islamic coins :The X-ray diffraction analysis of the corrosion products that were brought back to Japan showed that the coins had active bronze dise-ase, mainly caused by Atacamite.2. Choice of cleaning agent :It was imposible to remove the rust by useing mechanical methods because of the number of coins and the short period available for treatment. Therefore chelating agents were required for chemical treatment, which have been used recently for the removal of corrosion products of the copper alloy.From the experiment, it became clear that the Gluconic acid chelating agenent was suitable for long period steeping, and EDTA・3Na was good for short period steeping.3. The effects of treatment by desalting and stabilization depending on the difference of corrosion products :1000 coins were classified into 9 types according to their surface corrosion products, and 30 typical coins were selected from each type. These were examined to see the effects of desalting and stabilization. The results made clear that the corrosion products attacked with bronze disease should be removed as much as possible.4. The evaluation method for conservation treatment :The amount of agents and chloride remaining was checked by measuring the water with pH, sodium ions and chlorine ions that the coins were washed in. The effect of the treatment was measureed by examining the coins after putting them under high humidity.A guide for conservation treatment process :The guide is made for beginners who would like to do this treatment, and who would like to ensure proper application of the treatment.

1.出土古伊斯兰钱币腐蚀产物分析：对带回日本的腐蚀产物进行X射线衍射分析表明，该钱币存在活跃的青铜病，主要是由绿铜矿引起的。2． ：由于硬币数量多且处理时间短，无法使用机械方法去除锈迹，因此需要使用螯合剂进行化学处理，最近已使用螯合剂来去除铜的腐蚀产物。实验表明，葡萄糖酸螯合剂适合长时间浸泡，而EDTA·3Na则适合短时间浸泡。3．根据腐蚀产物的不同，脱盐和稳定化处理的效果不同。 ：将 1000 枚硬币根据其表面腐蚀产物分为 9 类，并从每种类型中选取 30 枚典型硬币进行检验，以了解脱盐和稳定化的效果。应尽可能去除受青铜病害影响的腐蚀产物。 4. 保护处理的评价方法：通过测量水的pH值、钠离子和氯离子来检查残留的药剂和氯化物的量。处理的效果是通过将硬币置于高湿度下后进行检查来测量的。保存处理过程指南：该指南是为想要进行此处理并希望确保其安全的初学者编写的。正确应用治疗方法。