TITLE:
Erratum to the Influence of Gaseous Pollutants on Silver Artifacts Tarnishing, Vol. 6 (2017), 135-148
AUTHORS:
Yussri Salem
KEYWORDS:
Silver, Artifacts, Atmospheric Corrosion, Gaseous Pollutants
JOURNAL NAME:
Open Journal of Air Pollution,
Vol.11 No.3,
August
31,
2022
ABSTRACT: The original online version of this article Salem, Y. (2017) The
Influence of Gaseous Pollutants on Silver Artifacts Tarnishing. Open Journal of
Air Pollution, 6, 135-148. doi: 10.4236/ojap.2017.64011 unfortunately contains
grammar mistakes. The author wishes to correct the errors.
The
present work investigated the effect of common gaseous pollutants on silver
artifacts. The study was carried out on coupons made of a silver alloy (91
silver and 9% copper) with chemical composition similar to ancient Egyptian
silver artifacts. These coupons were exposed to gaseous pollutants such as
sulfur dioxide, nitrogen dioxide, carbon dioxide, hydrogen sulfide and
chlorine, each gas separately. The exposure period was four weeks
inside a climate chamber with 10 PPM concentration of each gas. After each
test, examinations by SEM and PM were used to evaluate the effect of each gas
and observe the formed tarnish layers. The results revealed that all gases
reacted with the surface except carbon dioxide. The formed tarnish layers
varied in coverage and density rate, and the heaviest layer was of H2S coupons. The tested coupons were analyzed by XRD and the results
revealed Ag2S, AgCl, Ag2SO4, Ag(NO3)3(NO)3,
AgO and Ag2O as corrosion products.