Volatile Corrosion Inhibitor
A Volatile Corrosion Inhibitor (VCI) (volatile corrosion - inhibitor ) is to protect a substance that metallic vapor out materials from corrosion.
VCI materials develop their effect on the metal surface, on which they are adsorbed and form a protective layer against the effects of oxygen and / or water. They are characterized by a high vapor pressure at relatively low temperatures. It is z. B. to salts ( amines , nitrites ), which are introduced into paper or carrier foils, from which they then gradually outgas. If the workpiece to be protected is enclosed in this packaging, an atmosphere saturated with the inhibitor is established. After unpacking the workpiece, the inhibitor evaporates without leaving any residue. This is also the main advantage over protective layers made of oils or waxes, which have to be removed at great expense.
Common inhibitors are
- for copper benzotriazole or tolyltriazole (weaker effect also on zinc )
- for iron dicyclohexylammonium nitrite and dicyclohexylammonium carbonate
Web links
Individual evidence
- ↑ a b Entry on VPI. In: Römpp Online . Georg Thieme Verlag, accessed on April 6, 2016.