AUTHOR(S):

Yussri Salem

TITLE

The influence of gaseous pollutants in silver artifacts tarnishing

ABSTRACT

The present work aims to study the effect of the common gaseous pollutants on silver artifacts corrosion. The study will be carried out manufactured coupons of silver alloy (91 silver, 9 copper) which have chemical composition similarly to ancient Egyptian silver artifacts. These coupons will be exposed to gaseous pollutants of each individual gas; such as Sulfur dioxide, Nitrogen dioxide, Carbon dioxide, Hydrogen sulfide and Chlorine. The exposure period will be four weeks in a climate chamber with gas concentration 10 PPM. After test Examinations by SEM and PM were used to evaluate the effect of each gas and description the morphology of the corrosion layers. Results revealed that all gases reacted with the surface except carbon dioxide. Formed tarnishing layers varied in coverage and density rate. Corrosion products are analyzed by XRD and results were revealed Ag2S, AgCl, Ag2SO4 and Ag2O as corrosion products.

KEYWORDS

Silver, artifacts, atmospheric corrosion, gaseous pollutants.

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Cite this paper

Yussri Salem. (2018) The influence of gaseous pollutants in silver artifacts tarnishing. International Journal of Cultural Heritage, 3, 1-10

Copyright © 2018 Author(s) retain the copyright of this article.
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