Passivation is the process of making a material "passive", usually by the deposition of a layer of oxide that
adheres to the metal surface. Passivation affects the properties of almost all metals. In the context of
corrosion, passivation is the spontaneous formation of a hard non-reactive surface film that inhibits further
corrosion. This layer is usually an oxide or nitride that is a few nanometers thick.
ScaleAwayPPETM corrosion inhibitor helps the formation of a passivation layer on the surface of the metals to
which it is applied. Some compounds, dissolving in solutions (chromates, molybdates) form non-reactive and
low solubility films on metal surfaces.
A typical passivation process after chelating oil coolers and heat exchangers with ScaleAwayMSATM involves a
complete neutralizing rinse with ScaleAwayPPETM corrosion inhibitor. This process will restore the passivation
layer. This passivation layer will inhibit calcium carbonate scale from adhering to the metal surface for a period of
3 months.
The advantages of ScaleAwayPPETM corrosion inhibitor:
Increases the activation energy on the metal surface (passivation)
Has been shown to eliminate corrosion over wide range of pH values
Adsorbs and forms a thin polymeric layer on the metal
Ensures that there is no scale build-up for 3 months
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