Tarnishing of silver in environments with sulphur contamination

Author:

Jiang Yang Chang,Hao Liang Cheng,Liu Xia

Abstract

PurposeThis paper seeks to investigate work on silver sulphide formed on the surface of silver metal which was exposed to an environment containing sulphur contamination.Design/methodology/approachLaboratory tests were performed to determine the effect of the surface state, relative humidity, temperature and illumination.FindingsIt was indicated that sulphuration of silver was accelerated by mechanical polishing and illumination. The exposure was performed at 0, 54, 75 per cent relative humidity (rH) and at 16, 25, 37, 47 and 57°C. The tarnish rate at 54 per cent rH was more than two times than that at 0 per cent rH or 75 per cent rH, and the rate increased as a function of temperature.Originality/valueA tarnish model was proposed. The tarnish reaction of silver is chemical reaction controlled, which is in accordance with the result deduced from the model.

Publisher

Emerald

Subject

General Materials Science,General Chemical Engineering

Reference11 articles.

1. Fang, J. and Cai, M. (1988), “Tarnish and protection of plated silver”, Science in China Series B: Chemistry, Vol. 5, pp. 473‐8.

2. Fukuda, T. and Fukushima, Y. (1991), “Indoor corrosion of copper and silver exposed in Japan and ASEAN countries”, Journal of the Electrochemical Society, Vol. 138 No. 5, pp. 1238‐46.

3. Hindin, B. and Fernandez, J. (2003), “Testing of conformal coatings using the flowers‐of‐sulphur test”, Tri‐service Corrosion Conference Proceedings, Las Vegas, Nevada. November, pp. 17‐21.

4. Kim, H. (2003), “Corrosion process of silver in environments containing 0.1 ppm H2S and 1.2 ppm NO2”, Materials and Corrosion, Vol. 54, pp. 243‐50.

5. Mao, X. and Tian, K. (1995), “Tarnishing mechanism of silver and anti‐tarnishing process”, Electroplating & Pollution Control, Vol. 15 No. 1, pp. 8‐12.

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