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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
