Answers to Your Questions about Volatile Corrosion Inhibitors
What is volatile corrosion inhibition?
Volatile corrosion inhibition is a function of a combination of related factors:
- Chemicals used;
- Ratios of the chemicals in the formulation;
- Compatibility;
- Amount of chemical present (coat weight)
These factors do not work independent of each other, but are synergistic in making an effective VCI. For example, the best VCI formulation in the world will not be able to provide the 3 to 5 molecule layer barrier on the metal surface if the amount of VCI present in the paper or film is too low (the coatweight). The metal will corrode in spite of the presence of a highly effective VCI formulation.
Why does Daubert Cromwell offer so many VCI formulations?
Daubert Cromwell's product line offers different VCI formulations and products to accomplish a broad range of protection requirements. Some companies only offer a "multi-metal" inhibitor. However, to make a multi-metal inhibitor, the formulation must contain a range of corrosion inhibitors some of which are not ferrous inhibitors. Daubert Cromwell does not believe in this "one product fits all" approach. We tailor our formulations to meet the specific needs of each manufacturer and to maximize product performance.
Why does Daubert Cromwell test for compatibility?
When a product is packaged in VCI, it frequently is not completely dry or "bare" of any chemical or chemical residue. In fact, metal parts frequently have oils or chemical residues on their surfaces. These residual chemicals may interact with chemicals in the VCI formulation. The result of incompatible chemical systems can be either attack of the metal or loss of the effectiveness of the corrosion protection.
