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| PROGRESS OF TARNISH MECHANISM FOR SILVER COIN |
| LIANG Chenghao1,YANG Changjiang2,HUANG Naibao1, JIN Guangming1, PAN Shu1 |
1. Institute of Corrosion Control and Electrochemical Engineering, Dalian Maritime University, Dalian 116026
2. Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming,650093 |
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Abstract Rust spots and tarnish on the surface of silver coin were the two major issues in the world and neither one had been explained clearly. This article was to summarize the research progress of silver coin tarnish and its mechanism in recent years. The overview focused on the effect of corrosion media including oxygen, hydrogen sulfide, sulfur and sulfur dioxide on silver tarnish. At one time, the effect of environmental factors, such as ambient humidity, temperature, illumination, etc., was also introduced. The corrosion products on the surface of silver coin in atmospheric environment were analyzed and the outlook of anti-tarnish for silver coin was proposed.
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Received: 15 February 2011
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Corresponding Authors:
liang chenghao
E-mail: lchenghao@126.com
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