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Corrosion Inhibitors
Corrosion Inhibitors

Corrosion is an event of gradual degradation of materials, in particular metals and alloys, that occurs due to chemical reactions with the environment. The most common is metal oxidation. Exposure of material to air, water or specific aggressive chemical environment is the origin of corrosion. 

Material’s corrosion resistance can be increased reducing the activity of exposed surfaces by chemical passivation or by inhibition and/or neutralization of corrosive agent species present in the environment.

Corrosion inhibitors are largely used to prevent and control corrosion phenomena in the following treatment plants:

•Condensate recovery system

•Cooling towers circuit

•Boilers feed water

•Heat exchangers

•Water based Drilling fluids for Oil fields

•Thermal desalination

•Multi Stage Flash desalination (MSF)

•Water injection for Oil fields

Cathodic Corrosion Inhibitors

Reduction of Cathodes Area by formation and precipitation of insoluble salts on it, decreasing corrosion rate

Zn Salts

Ca Salts

Mg Salts

Polyphosphates

Anodic Corrosion Inhibitors

Reduction of Anode area by formation of thin oxyde layer on it decreasing corrosion rate

Chromate

Nitrite

Molybdate

Orthophosphonates

Adsorption Corrosion Inhibitors

Decrease of corrosion rate due to metal polarisation and formation of a thin layer of inhibitor by chemical adsorption on metal surface

Amine

Carboxyls

Phosphonates

Imidazoline

Volatile Corrosion Inhibitors

Vapor of Inhibitors condensate on metal surface forming a protective layer reducing corrosion rate

Cyclohexylamine

Aminoalcohols

Nitrites