VCI Packaging for Corroded Parts: What to Expect

VCI packaging for corroded parts helps slow further corrosion, but it does not remove rust that already exists. When parts with visible corrosion are enclosed in properly selected ZERUST® VCI products, the vapor corrosion inhibitors protect exposed metal surfaces by interrupting the electrochemical corrosion process. This protection stabilizes the condition of the part and helps prevent corrosion from spreading or worsening during storage or shipment.

How VCI Works on Already Corroded Metal

Vapor Corrosion Inhibitor Technology (VCI) works by releasing corrosion-inhibiting vapor molecules into a sealed enclosure. These molecules are attracted to metal surfaces, where they form a microscopic protective layer. On corroded parts, this layer:

• Protects areas that are not yet rusted
• Slows corrosion activity at the edges of existing rust
• Helps prevent new corrosion from forming on adjacent surfaces

However, VCI molecules do not chemically convert, dissolve, or remove existing corrosion. The rust remains in its current state unless it is mechanically or chemically removed beforehand.

Should Rust Be Removed Before Packaging?

In most cases, yes. Removing rust before applying VCI packaging delivers the highest level of corrosion protection and extends part life. After rust removal, VCI packaging protects freshly exposed metal surfaces without leaving oils, greases, or residues.

If rust removal is not immediately possible, VCI packaging can still provide value by slowing further corrosion until proper treatment can be performed.

Learn More About Rust Removal and Corrosion Protection

If you are dealing with parts that already show signs of corrosion, understanding when to remove rust and when to stabilize parts with VCI is critical. ZERUST® offers both corrosion prevention solutions and rust removal technologies to support the full metal protection process.