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THE REMOVAL OF CORROSION PRODUCTS ON EXCAVATED METAL ARTIFACTS USING CHELATING AGENT

使用螯合剂去除出土金属文物上的腐蚀产物

基本信息

批准号：
05835026
负责人：
KAWAMOTO Kozo
金额：
$ 1.28万
依托单位：
Gangoji Institute for Research of Cultural Property
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1993
资助国家：
日本
起止时间：
1993 至 1994
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-05835026/
关键词：
chelating agent EDTA ultra-violet spectroscopy corrosion products copper alloy artifact impregnation and coat fluorolefin acryl copolymer removal of corrosion products 青銅除錆

项目摘要

1. Selection of Chelating agentWe had first compared EDTA-3Na and NTA-2Na on the market of wide use. Both solution are almost neutral and have the same effect of removing corrosion products on copper alloy objects. We chose EDTA-3Na, because the solution of NTA-2Na slightly stimulated the skin, and continued our study.2. Removal of chelating agent from treated objectsAfter several time of washing with standing and flowing distillled water, the agent was not detectable by ultra-violet spectroscopy. But in a few cases new corrosion products appeared on the treated surface. We thought they were changed sensitive by the treatment and tried to stabilize the corrosion.3. Adequate quantity of chelating agentDuring treatment, we measured solution within the measurement limits by UV spectroscopy showed the degree of reaction. When the solution was regulated to react 0.3 to 0.5 mol of copper ion per mol of EDTA-3Na, we treated them quickly and economically.4. Stabilization of the surface of treated objects.Generally most of new corrosion products on the bronze objects treated by chelating agent are stabilized by benzotriazole (BTA).In case that it should not work, we examined the objects impregnated and coated with fluorolefin acryl copolymer under high humidity conditions. This resin has high effectiveness to shut off oxygen and vapor, and yet is easily solved by solvent after treatment.5. Removal of corrosion products from iron objects.We applied above agent to iron objects. The layr of corrosion products which is already fragile is easily removed by mechanical methods. Chelating agent does not help much than the usual mechanical removal methods.

1. 螯合剂的选择我们首先比较了市场上广泛使用的EDTA-3Na和NTA-2Na。两种溶液几乎为中性，对铜合金物体的腐蚀产物去除效果相同。我们选择了EDTA-3Na，因为NTA-2Na溶液对皮肤有轻微刺激，我们继续我们的研究。用静水和流动蒸馏水洗涤几次后，用紫外光谱法检测不出螯合剂。但在少数情况下，处理后的表面出现了新的腐蚀产物。我们认为它们在处理后变得敏感，并试图稳定腐蚀。在处理过程中，用紫外光谱法测定溶液在测定范围内的反应程度。当溶液调节为每mol EDTA-3Na反应0.3 ~ 0.5 mol铜离子时，处理速度快，经济。被处理物体表面的稳定化。一般来说，螯合剂处理的青铜器上的新腐蚀产物大多由苯并三唑（BTA）稳定。为了防止它不能工作，我们在高湿条件下检查了用氟烯烃-丙烯共聚物浸渍和涂覆的物体。该树脂阻氧阻汽效果好，处理后易被溶剂溶解。清除铁质物体上的腐蚀产物。我们把上述药剂用在铁制品上。已经很脆弱的腐蚀产物层很容易用机械方法去除。螯合剂比通常的机械去除方法没有多大帮助。