Corrosion Inhibitors

Sika® CNI

Calcium nitrite-based admixture designed to inhibit the corrosion of steel in reinforced concrete.

Sika® FerroGard®-901 S

Sika® FerroGard®-901 S is a liquid concrete admixture formulated to protect embedded reinforcing steel from corrosion, and to provide an effective means for
extending the service life of concrete structures.

How it Works:

In sound concrete, steel reinforcement is protected by the highly alkaline environment which deposits a passivating layer of iron oxides around
the steel. This passivating layer can be broken down by a number of destructive mechanisms, including carbonation and chloride penetration. Once the steel loses its protective layer, corrosion can begin to occur. Steel corrosion is an electrochemical process consisting of two partial reactions, one at the cathode and one at the anode. Sika® FerroGard®-901 S is an active, dual purpose inhibitor containing a combination
of aminoaclohols, and organic and inorganic inhibitors. This protects both the anodic and cathodic parts of the corrosion cell. Due to its high vapor pressure, Sika® FerroGard®-901 S penetrates through concrete to the steel reinforcement, where it is absorbed onto the surface. Sika® FerroGard®-901 S forms a continuous protective film around the steel presenting a physical barrier to chlorides and other deleterious substances. Because of its high affinity to steel, Sika® FerroGard®-901 S is also able to displace chloride ions from the metal surface to protect concrete from chloride induced corrosion.