Headings VCI Corrosion Protection Headings Mode of action

Mode of action

Volatile Corrosion Inhibitor designates a “corrosion inhibitor that vaporises at normal temperature and pressure”. This is understood to mean an active substance which is transported by the gaseous phase and which intervenes in the corrosion process in an inhibitory manner. The VCI active substance evaporates from the carrier material (e.g. LDPE film) and condenses on bare metal surfaces in a monomolecular layer. In the process, an invisible protective coating, which reliably protects the metal against corrosion, is formed.

The acronym VCI describes an active system. It is not a registered trademark with defined quality criteria. EXCOR exclusively uses active substances and materials for which the current Hazardous Substance List of EU Directive 67/548/EWG (29th Adaptation, April 2006) does not stipulate labelling as hazardous and for which no workplace threshold limit values (AGW) have been established and, also on the basis of TRGS 615 (Version of May 2007 ), for which no monitoring measures for their use are required.

Metals which are enclosed in an EXCOR VCI packaging are protected against corrosion by the following modes of action:

  1. EXCOR VCI active substances sublimate out of the carrier material, e.g. VCI film VALENO or VCI-paper ABRIGO into the package space.
  2. The EXCOR VCI active substances mix in the package space as a result of diffusion, accumulate there and begin to adsorb on the metal surface.
  3. Formation of a monomolecular EXCOR VCI film on the metal surface.

If an EXCOR protective film has formed on the metal surface, the metal is effectively protected against the negative influences of atmospheric oxygen and moisture.

Headings Continue with »Advantages«