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VCI-Principle

VCI means Volatile Corrosion Inhibitor, in other words a volatile prevention of corrosion or anticorrosive. The term VCI inhibitor is understood to mean the working of special volatile linkages into differing carrier materials. Inherent inhibitor vapour pressure causes them to evaporate out of the carrier material and to diffuse within the packaging. They are absorbed onto metal surfaces in the form of an invisible film. Once there, they provide active protection against the breakdown of the passive layer.

Three mechanisms are discussed for corrosion protection:

Active mechanism 1 - preventing access of water

VCI component forms an adduct with the metal surface and displaces humidity (surface hydrophobisation)
Evaporation of water on the passive layer and barring the entry of new water/oxygen
No further reactions are possible
Lack of electrolytes prevent the passive layer’s decomposition

This mechanism applies for the protection of all metals.

Active mechanism 2 - changing the metal surface

Agent is absorbed into the humid film (electrolytes)
Metal surface is modified by the VCI component’s oxidation properties
The resulting ‘superior’ metal surface is not susceptible to corrosion under prevalent conditions
Repair of the destroyed passive layer

This mechanism applies for the protection of ferrous metals.

Active mechanism 3

Modification of the environment’s pH value making any corrosion impossible

This mechanism applies for the protection of all metals.

Active VCI substances can be integrated in a wide range of carrier materials. For example papers, films or fluids.

Advantages of the VCI-method

When paper/film is used the packing doubles as corrosion protection
Paper/film/chips are recyclable
Paper = renewable raw material
No cleaning required, all parts are ready for use right away
Brief opening of packaging creates no problems (customs)
No special requirements for safety at work

Limits of the VCI-method

Product needs to be explained because different VCI grades for different metals
Wrong VCI grade may attack protected material
Parts for packaging must be free of soiling (finger prints, residues of baths)

These limits can be broken by consulting experts.

BRANOcell	BRANOplast	BRANOfluid	BRANOvac
VCI Paper \| VCI Chips	VCI Films	Corrosion Protection Fluid	Laminated Aluminium Film