Leaders in Vapor Corrosion Inhibitor (VCI)
What is a Vapor Corrosion Inhibitor (VCI)?
Vapor Corrosion Inhibitors (VCIs) are advanced chemical formulations that protect metals from corrosion. Originally patented by Shell in 1948, VCI technology has expanded significantly, with delivery methods ranging from powders and liquids to infused plastics, oils, and greases. Today, VCIs are widely adopted across diverse industries, including automotive, industrial equipment, electronics, packaging, infrastructure, and energy. Their use continues to grow as more sectors recognize the value of clean, effective, and versatile corrosion protection.
Regulations for VCI Use
API TR 655 was published by the American Petroleum Institute (API) to provide information detailing the use of Vapor Corrosion Inhibitors (VCIs) for protection of the soil-side of tank bottoms from corrosion.
Applications for VCI
VCI’s are used for corrosion protection of metals in static, enclosed environments such as:
- Beneath Tank Floors
- Inside the annulus of Pipe Casings
- Inside Out-of-Service Pipelines
- Enclosures with Spare Parts
- Pipe Segments
- And More
How do VCIs Work?
The nature of the VCI is to volatize from a solid or a liquid, into a gas. The gas or vapor molecule then adsorbs and takes precedence on the surface of the metal in that enclosure, forming a mono-molecular barrier layer. This barrier layer blocks other molecules (i.e.; water and oxygen) from attaching to the steel surface, thereby minimizing the potential for corrosion.
The VCI’s can also neutralize the corrosive effect of water and oxygen. The VCI powder is often mixed with water which acts as the delivery mechanism for the VCI to get to where it is needed.
Corrosion Protection for Hard-To-Reach & See Areas
Corrosion often occurs in areas that aren’t visible or easily accessible making protection difficult. VCIs are able to give corrosion protection for both the visible and hard to see and easily accessible and hard-to-reach areas.
Want More Information on VCIs?
ZERUST® Integrity Solutions is a world leader in protecting bare metals from corrosion using Vapor Corrosion Inhibitors (VCIs). VCIs can be used to protect these metal parts from corrosion without the need for greases or painting. ZERUST® VCIs have been effectively and safely used to protect valuable parts and equipment for more than 40 years. Please contact us if you have any questions about the use of VCIs or if you would like more information regarding our corrosion mitigation solutions for protecting your assets.
Types of Corrosion Inhibitors
Vapor Corrosion Inhibitors (VCIs) are just one type of corrosion protection used across industries such as mining, petrochemicals, offshore wind, marine, shipbuilding, oil and gas, and beyond.
