Comparison of VCI & NON VCI Packaging
VCI Stands for Volatile Corrosion Inhibitors. A VCI packaging contains chemicals within the polymer matrix that can evaporate and protect corrosion on metal parts. This is done in 3 ways.
evaporation and condensation of active molecules and forming a multimolecular layer on the surface of the metal
evaporation and attachment of VCI molecules with water vapors and when these settle on the metal parts, the corrosion action is inhibited by the vci molecules
Alteration of the pH of the inside atmosphere which in effect reduces the corrosion forward reaction.
A normal plastic bag doesnot contain VCI molecules and hence cannot reduce the corrosion rate and hence doesnot increase the shelf life of a packed metallic component.