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.对出土的伊斯兰古钱币腐蚀产物的分析：对带回日本的伊斯兰古钱币腐蚀产物进行X射线衍射分析，发现伊斯兰古钱币存在着以阿塔卡米石为主的活性青铜病.清洗剂的选择：由于硬币数量多，处理时间短，用机械方法去锈是不可能的。因此，化学处理时需要使用螯合剂，近年来，螯合剂被用于去除铜合金的腐蚀产物，实验表明，葡萄糖酸螯合剂适合于长时间浸泡，EDTA·3Na适合于短时间浸泡.根据腐蚀产物的不同，对1000枚硬币进行了表面处理和稳定化处理，并根据腐蚀产物的不同将其分为9种类型，每种类型选取30枚典型硬币。对这些进行了检查，以了解稳定性和稳定性的影响。研究结果表明，对于青铜病侵蚀的腐蚀产物，应尽可能去除.保护处理的评价方法：通过测定硬币洗涤用水的pH值、钠离子和氯离子，来确认试剂和氯化物的残留量。将硬币置于高湿度环境下，通过检查硬币来衡量处理效果。保护处理过程指南：本指南是为想要进行保护处理的初学者以及想要确保正确应用保护处理的初学者而制作的。