Concrete Repair and Specialty

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MCI Mini Grenades®

Product Description

MCI Mini Grenades® consist of Migrating Corrosion Inhibitors (MCI®) packaged in water-soluble PVA bags. MCI Mini Grenades® are very convenient to use.

MCI Mini Grenades® are ideal for repair mortars-one Mini Grenade protects 0.4-0.6 ft3 (0.015 m3). The grenade dissolves easily when in contact with water in the concrete mix. During mixing the bag will completely dissolve and the MCI compounds will begin to disperse into the mix.

The MCIs protect reinforcing steel, galvanized steel, and other metals embedded in concrete from corrosion induced by carbonation, chloride, and atmospheric attack. When incorporated into the concrete mix the MCIs form a corrosion inhibiting protective layer on metals. When used with repair mortars and grouts, MCIs will migrate toward the rebars providing effective corrosion protection.

Where to Use

MCI Mini Grenades® are recommended for:

• All reinforced, precast, prestressed, post-  tensioned, or marine concrete structures

• Steel-reinforced concrete bridges, highways, and streets exposed to corrosive environments (carbonation, deicing salts, and atmospheric attack) • Parking decks, ramps, and garages • Concrete piers, piles, pillars, pipes, and utility poles • Restoration and repair of all reinforced concrete commercial and civil engineered structures


• Offers engineers, owners, contractors, DOTs, and government agencies a time proven corrosion inhibiting technology that will extend the life of reinforced concrete structures • Protects against the harmful effects of corrosion even in the densest concrete • Does not affect air entrainment, compressive strength, or the set time of concrete mix • Required dosage is not affected by chloride concentration • Does not contain calcium nitrite • Non-flammable and environmentally friendly • Lab and field tested • Concentrated for cost effectiveness on all projects • Will migrate to adjacent areas to protect surrounding metals • Cortec logo on each bag ensures MCI® inhibitor is inside.

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CorrVerter® MCI® Rust Primer

Product Description

CorrVerter® MCI® is a single component, fast drying, water-based primer that converts rusted surfaces to a passive layer. It provides long term corrosion protection by itself or by top coating for extended performance. CorrVerter® is recommended for application to rusty or poorly prepared steel surfaces where further corrosion protection is required and good surface preparation is difficult to achieve. CorrVerter® is formulated to penetrate and eliminate rust as well as to protect bare metal to stop further rusting.

How It Works

CorrVerter® contains a unique formulation of chelating agents combined with a high solids waterborne latex with extremely low water vapor permeability. The combination of these materials modifies the surface rust into a hydrophobic passive layer, offering a unique formulation primer with excellent protection against rerusting.

CorrVerter® MCI® does not contain tannic or phosphoric acids, provides long-term corrosion protection for poorly prepared substrates, and can be topcoated with solvent-based and water-based paints with no bleeding. 

CorrVerter® Bond Strength Test

CorrVerter User Guide


CorrVerter® MCI® offers engineers, owners, contractors, DOT’s, and other government agencies a convenient, low-labor option when performing repairs on heavily corroded rebar and other metal surfaces.

• Coated rebar has equal or better bond  strength to concrete • Converts rust quickly and can be applied under varying weather conditions • Can be topcoated with water or solvent-based topcoats (tannic and phosphoric acid converters can only be topcoated with solvent-based topcoats)

• Better protection against re-rusting than tannic or phosphoric acid-based converters

• Works in HCl, H2S, SO2, and CO2 vapor environments • Water based and non-flammable, non-combustible

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MCI®-309 Corrosion Inhibiting MCI Powder for Ferrous Metals

Product Description 

MCI®-309 is a Vapor phase Corrosion Inhibitor powder for corrosion protection of ferrous metals in recessed areas, interior cavities, and voids. MCI®-309 provides an extremely efficient dry method to protect metals within an enclosed space. The MCI® vaporizes and adsorbs on the metal surfaces, reaching all exposed areas, including recessed sections and interior cavities. It is a mixed inhibitor that provides protection to both the cathodic and anodic sites of metal.


• Does not affect physical properties of concrete or grout (set time, strengths, etc)

• Is safe for high tensile strength steel (will not cause hydrogen embrittlement) • Does not contain silicates, phosphates, nitrites, or heavy metals • Provides up to 24 months of continuous protection • Provides monomolecular inhibiting layer • Vapor phase inhibiting action protects inaccessible and recessed surfaces • Protected surfaces do not have to be cleaned prior to concrete or grout placement • If MCI® layer is disturbed by moisture or opening the enclosed space, the layer is replenished by continuous vapor redeposition • Little or no surface preparation is required • Prevents further corrosion of pre-coated and painted surfaces • Easy to apply • MCI® layer does not need to be removed prior to processing or use • Powder can be removed by air gun or water • Provides protection to ferrous metals and aluminum 


• Prestressed tendons • Segmental concrete bridges tendons • Post tensioned Box Girder Bridges • Tubular structures, pipes, and vessels • Equipment protection after hydrostatic testing • Parts, components, and completed assemblies during shipping and storage

Video of application

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MCI® Coating for Rebar NT

Product Description

MCI® Coating for Rebar NT provides excellent protection in outside storage as well as offering excellent corrosion resistance for embedded reinforcement. This product is water based and environmentally friendly.

The recommended film thickness range is 1-3 mils (25-75 microns) dry film thickness. As a soft non-tacky film, MCI® Coating for Rebar NT is an excellent choice for long-term indoor protection (up to 5 years*) and short to medium-term (6-24 months*) unsheltered outdoor protection. The product cures to a soft non-tacky film and eventually hardens. MCI® Coating for Rebar NT has been tested for reinforcing steel bond strength in accordance with ASTM A944-99. The results of this test were exceptionally good confirming that MCI® Coating for Rebar NT does not have to be removed prior to embedding in concrete (see Table 2). *Depends on conditions and/or film thickness


• Excellent outdoor protection • Multimetal protection • Safe and easy to use • Environmentally friendly • Does not affect concrete adhesion to rebar


• Temporary storage of reinforcement and other metal components used in concrete construction • Processing protection

• Overseas shipping • Maintenance repairs

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How Does The  MCI® Technology Work?

The corrosive effects of carbonation and chlorides cause a breakdown of the natural passivating layer on steel in concrete. MCI® provides protection because of their ability to migrate to the depth of the metal, and form a protective, molecular layer on steel when they come into contact with it.

MCI® move as a liquid into the concrete matrix. In new construction,  MCI® is admixed either with the batch water or directly into a mixer. For existing structures,  MCI®  applied to the surface is drawn into the concrete via capillary action—the concrete acts like a sponge, drawing  MCI®  inside.

MCI move in a vapor phase throughout the concrete pore structure. This movement is governed by Fick’s Law, meaning molecules move randomly throughout the matrix from areas of high concentration to areas of low concentration.

When MCI come into contact with steel, it has an ionic attraction to it, and forms it’s protective, molecular layer. MCI’s affinity to the metal is stronger than water, chlorides and other corrosive contaminants.

Independent testing has confirmed that MCI can adsorb onto metal to a depth of 75-85 nm, forming a layer that is between 20 and 100% thick. In the same testing, chlorides were shown to penetrate only 60 nm deep. This confirmed the ability of MCI to displace chlorides on the metal surface and provide protection even in their presence.


MCI_Mini_Grenades (pdf)


CorrVerter_MCI_Rust_Primer (pdf)


MCI-309 (pdf)


MCI_Coating_for_Rebar_NT (pdf)


CorrVerter Use guide (pdf)



MCI-Chemistry 4.20.17 (pdf)


Bond Strength Testing of Reinforcing Steel Bars (pdf)



Application of MCI-309 powder to protect cables

How Cortec MCI's work