How VCI works
V = Volatile
C = Corrosion
I = Inhibitor
Volatile corrosion inhibitor
Rust inhibitors are volatile substances that can be adsorbed on the metal surface, so it can prevent the surface layer from being rusted away passively.
working principle
The VCI rust inhibitor has air pressure, which permanently releases a small amount of rust inhibitor (PPM grade) to the environment. A few milligrams of VCI can prevent rust in 1m³ packaging.
The outer packaging must prevent the vaporization and evaporation of the rust inhibitor, and the original rust layer of the metal cannot be eliminated.
As the sublimation generates vapor from the bottom layer, it continues to diffuse inside the package until the gas layer in the package is saturated, forming a protective gas layer, forming an invisible protective film layer on the metal surface (including hard-to-reach places).
Three working mechanisms
Working mechanism one
The VCI component forms a thin protective layer on the metal surface, which can block moisture (surface hydrophobicity) and evaporate the water contacting the surface layer.
Unless new moisture or oxygen enters, no new reaction will occur. Does not contain electrolyte to prevent corrosion and decomposition of the surface layer.
This working mechanism is suitable for rust protection of non-ferrous heavy metals.
Working mechanism two
The rust inhibitor is sucked into the wet layer (electrolyte), and the metal surface is changed by the oxidation characteristics of the VCI component.
Under normal conditions, this “high-grade” metal surface will not be rusted, and repair the damaged surface.
This working mechanism is suitable for rust protection of ferrous metals.
Working mechanism three
Changing the pH value of the environment makes it impossible for any rust to occur in this working mechanism.
Suitable for rust protection of all kinds of metals.
