Vapor corrosion inhibitors (VCI) are substances that slowly release a corrosion preventative compound into a sealed air space, effectively protecting exposed metal surfaces. VCIs are often used where rust preventative liquids or surface treatments are impractical or undesired.
What is VCI Film?
What is VCI Film?
VCI (Volatile/Vapor Corrosion Inhibitors) Film is a polyethylene packaging material impregnated with VCI chemicals. These vapors form a molecular corrosion shield on metal surfaces and protect them for years. After removing the packaging, the molecules quickly evaporate, leaving parts clean and ready for use.
What is corrosion?
What is corrosion?
Corrosion is a chemical or electrochemical reaction between a material, usually metal, and its environment, causing deterioration. Examples include rust, white rust, tarnish, pitting, and flaking.
How do VCI products prevent corrosion?
How do VCI products prevent corrosion?
ZERUST® VCIs prevent corrosion by creating a protective barrier, emitting vapor molecules that passivate metal surfaces, and repelling water. The protective layer forms in enclosed spaces and dissipates when the enclosure is opened.
What are nitrites, and how are they used in VCI packaging?
What are nitrites, and how are they used in VCI packaging?
Nitrites (NO2) are compounds commonly used in food preservation. Sodium nitrite is effective as a corrosion inhibitor. ZERUST® formulations safely use nitrite-based chemistries without harmful amine–nitrite combinations found in older VCI technologies.
How does moisture affect the performance of VCI?
How does moisture affect the performance of VCI?
VCI films resist vapor penetration, but some moisture can enter. The VCI chemicals neutralize this moisture unless there is a major breach in the package. Proper sealing is essential to maintain protection.
How does VCI compare to desiccants?
How does VCI compare to desiccants?
VCI provides active corrosion protection by releasing protective molecules, while desiccants provide passive protection by absorbing moisture. Desiccants stop working once saturated, but VCIs continue emitting protective vapor.
Does VCI affect electronics, plastics, rubber, wood, or other non-metallic surfaces?
Does VCI affect electronics, plastics, rubber, wood, or other non-metallic surfaces?
ZERUST® VCI does not negatively affect electronics or non-metallic materials. Compatibility testing is recommended for complex applications.
What happens if corroded parts are packaged in VCI products?
What happens if corroded parts are packaged in VCI products?
VCI slows down further corrosion but does not remove existing corrosion.
What happens when wet parts are packaged in VCI?
What happens when wet parts are packaged in VCI?
Some corrosion may occur depending on moisture level and contamination before VCI molecules saturate the enclosure.
Can VCI bags be used with solvent coatings?
Can VCI bags be used with solvent coatings?
Yes. Solvent coatings that dry to a thin layer are compatible. Heavy or undried coatings may hinder VCI performance.
How long are parts protected after being removed from VCI packaging?
How long are parts protected after being removed from VCI packaging?
The protective layer dissipates within 2–4 hours. Corrosion timing depends on environmental conditions.
How long does it take for a VCI package to reach full protection?
How long does it take for a VCI package to reach full protection?
The time varies by enclosure size and temperature. Protection begins immediately once vapors reach metal surfaces; full saturation may take longer.
Does VCI affect electrical or electronic components?
Does VCI affect electrical or electronic components?
Tests show ZERUST® VCIs do not harm electronics and can improve reliability by preventing microscopic corrosion.
Are there inhalation or contact risks with VCI products?
Are there inhalation or contact risks with VCI products?
No. Scientific data confirms ZERUST® VCIs are non-toxic and safe for personnel.
Does ZERUST® have military approvals?
Does ZERUST® have military approvals?
Yes. Many ZERUST® VCI products have Mil-Spec, NSN numbers, and are on the GSA schedule.
What is the best way to store VCI products before use?
What is the best way to store VCI products before use?
Store in original packaging in a dry warehouse (0°F to 85°F / -18°C to 29°C, RH < 60%). Reclose packaging during downtime.
How is corrosion prevented?
How is corrosion prevented?
By reducing humidity, using nitrogen purge, coatings, or VCI packaging. ZERUST® integrates VCIs with materials and process management to create complete corrosion solutions.
Does ZERUST® offer accelerated corrosion testing?
Does ZERUST® offer accelerated corrosion testing?
Yes. ZERUST® engineers perform accelerated corrosion testing in climate simulation chambers to validate solutions.
What is VCI Paper?
What is VCI Paper?
VCI Paper is kraft paper infused with corrosion-inhibiting molecules. It protects metals by forming a microscopic invisible layer. Available in many formats and sizes.
What type of VCI packaging can be vacuum sealed?
What type of VCI packaging can be vacuum sealed?
ZERUST® SDA Advanced VCI film is suitable for vacuum sealing in harsh environments.
What are VCI bags and when are they used?
What are VCI bags and when are they used?
VCI bags are poly bags infused with VCI chemistry. They protect metals from rust during storage or shipping without needing oils or coatings.
