Vapor phase corrosion inhibitors, known as VpCI®s, protect multi-metals in enclosed environments. VpCI®s have a medium vapor pressure around 10-2 to 10-7 mmHg that causes it to vaporize or sublimate into to the vapor phase. Sublimation continues until the enclosed space is saturated achieving equilibrium. The VpCI® molecules diffuse from areas of high concentration to low concentration reaching all areas of the enclosure. VpCI® molecules can go wherever oxygen molecules can go making VpCI®s an effective protection method for hard-to-reach areas such as crevices. VpCI®s have an affinity and are attracted to metallic surfaces where they condense to provide protection. VpCI® molecules are based on amine carboxylate chemistry. These molecules are dipoles with non-uniform distribution of charges which translates into attractive forces that that pull the molecules towards the metallic surfaces.
The molecules arrange themselves parallel to one another and perpendicular to the metallic surface forming a monomolecular layer. This layer adsorbs to the metal, displaces the water molecules and protects the metal from corrosion. Being a dipole allows the protection of both the anodic and cathodic components of the corrosion cell. VpCI®s are effective at protecting multimetals in electrical, static, rotating and civil equipment and structures. Some of the well-known VpCI® products in Cortec®'s portfolio are VpCI®-337, VpCI®-609 and VpCI®-649. To view the complete range of Vapor Phase Corrosion Inhibitor product please visit Cortec® Middle East products page. To learn more about VpCI® Technology, visit VpCI® Technology Handbook. To learn more about MCI® Technology, visit Improving Durability of Infrastructure with Migratory Corrosion Inhibitors Handbook.