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首页> 外文期刊>Journal of Materials Science >Study of ancient lead materials: A gallo-roman sarcophagus - contribution of the electrolytic treatment to its restoration
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Study of ancient lead materials: A gallo-roman sarcophagus - contribution of the electrolytic treatment to its restoration

机译:古代铅材料的研究:高卢石棺-电解对其修复的贡献

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摘要

The restoration of metallic archaeological artefacts needs the knowledge of ancient materials - their composition, their state of conservation and their manufacturing process - to avoid any inappropriate action in the restoration process. This paper is devoted to the study of a lead gallo-roman sarcophagus, found in a much corroded state after a long burial in a calcareous soil in the banks of the Rhone River at Lyon ( France). From the metallographic observations, it was found that the lead sheets constituting the sarcophagus have been directly cast on a table covered with a bed of sand. In addition, the presence of a thick corrosion layer consisting of lead oxide, lead carbonates and some important penetrations of PbO in the metal explain the loss of lead ductility and the important brittleness of this ancient material. The mechanism of formation and growth of this PbO layer in a carbonated medium was studied using electrochemical experiments and metallographic observations. Finally, the comprehensive study of this complex material consisting of lead metals, a PbO/lead carbonate layer and some compounds of the soil allowed the setting up of a restoration process based on an electrochemical reduction method. (C) 2004 Kluwer Academic Publishers. [References: 21]
机译:金属考古文物的修复需要古代材料的知识-它们的组成,保存状态和制造过程-避免在修复过程中采取任何不适当的行动。本文致力于研究铅制的古罗马石棺,在法国里昂罗纳河两岸的石灰岩土壤中长期埋葬后,处于腐蚀严重的状态。从金相观察中发现,构成石棺的铅片直接浇铸在铺有沙床的桌子上。另外,由氧化铅,碳酸铅和金属中一些重要的PbO渗透组成的厚腐蚀层的存在解释了铅延展性的丧失和这种古老材料的重要脆性。使用电化学实验和金相观察研究了在碳酸介质中该PbO层的形成和生长机理。最后,对这种由铅金属,PbO /碳酸铅层和土壤中某些化合物组成的复杂材料的综合研究,使得可以建立基于电化学还原法的修复过程。 (C)2004 Kluwer学术出版社。 [参考:21]

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