New Technology for Vapor Corrosion Inhibiting (VCI) Transparent Plastic Packaging Combined with Acid Gas Scavenging (AGS)

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 in 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.