Acid-gas scavenging films (AGS) have existed in two forms, both with fillers that chemically react to
reduce diffusion of acid-gases into sealed bags. These provide corrosion protection from acid-gases
exterior to the package. They have no effect on corrosion in the presence of humidity and oxygen
inside the enclosure. One form, called AGS-Cu in this paper, is opaque and contains copper and
carbon particles. The other, called AGS, uses transparent inorganic oxide fillers, primarily to mitigate
tarnishing of silver and silverware. A new technology combines AGS and Vapor Corrosion Inhibitor
additives (VCI and VPI) for superior corrosion protection of multiple metals from the effects of internal
humidity and external acid-gases. Test data show that combined VCI & AGS give best corrosion
protection for a wider range of metals and atmospheric contaminants than VCI and AGS alone.
Corrosion testing should consider the confounding effects of VCI, AGS and desiccation.
Keywords: atmosphere, acid-gas, corrosion, tarnish, inhibitor, scavenger, volatile, vapor, AGS, VCI, VPI, ferrous,
non-ferrous, copper, silver