THE CHARACTERIZATION OF ANCIENT CHINESE WU ZHU COIN OF HAN DYNASTY AND ITS CORROSION MECHANISM

J Chin Soc Corr Pro

2007, Vol. 27

Issue (5): 303-308 DOI:

Research Report

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THE CHARACTERIZATION OF ANCIENT CHINESE WU ZHU COIN OF HAN DYNASTY AND ITS CORROSION MECHANISM

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西安交通大学

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Abstract This paper presents the joint research aimed at collecting technical information through an scientific examinations carried out on WuZhu coins from the largest mint site in the Chinese history. Optical microscopy (OM), scanning electron microscopy coupled with energy-dispersive X-ray analysis (SEM-EDX) as well as X-ray diffraction (XRD) have been used for both characterizing the elementary composition,morphology and corrosion products of coins.The analytical results revealed that the coin was made of bronze;the elementary composition is in good agreement with the information gathered through the historical survey. At the same time, the patina of coin was analyzed in this paper, mainly containing Cu2(OH)3Cl, Cu2(OH)3Cl, Cu3(CO3)2(OH)2, Cu2(OH)2CO3, CuO2 and some other minerals. The main corrosion products were azurite (2CuCO3·Cu(OH)2, blue appearance ), malachite (CuCO3·Cu(OH)2, dark green color), dioptase (CuCl2·3Cu(OH)2, CuCl2·Cu(OH)2, dark green color), cerusite (PbCO3) and others. Meanwhile, the artificial corrosion displayed that Cl-, O2, H2O were the most important factors for the erosion of WuZhu coin.

Key words: WuZhu coin bronze corrosion feature patina corrosion simulation

Received: 24 March 2006

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;. THE CHARACTERIZATION OF ANCIENT CHINESE WU ZHU COIN OF HAN DYNASTY AND ITS CORROSION MECHANISM. J Chin Soc Corr Pro, 2007, 27(5): 303-308 .

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y2007/V27/I5/303

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