Flash rusting is a significant problem for all water borne paint, especially over steel.
What Is Flash Rusting?
Flash rusting is corrosion from steel bleeding through a coating creating a stain within hours of the coating application. Long term corrosion is not flash rusting. This occurs when a thin film of water resides on the surface of steel for a brief period of time causing corrosion to take place. The corrosion products are often soluble and can migrate within a coating to produce a stain.
Flash rust is very common in water borne coatings since they have the two primary requirements to allow corrosion; oxygen and water. If either water or oxygen is not available, the metal corrosion rate will be retarded. Since water borne coatings are applied in a thin film, this allows oxygen to readily permeate through the coating. Henceforth, flash rusting is a common problem.
It usually occurs when there is high humidity, low temperatures, high wet film thickness, another cause is low coverage over a higher blast profile.
Our full range of metal protective products can be found on our website here.
If you would like to find out more see these other articles:
- How To Stop Rust
- How To Clean Rust Stains From A Patio
- Industrial Rust Protection Case Study In Belgium
- Zinga Cold Galvanizing A Narrowboat
Do you require more information on flash rust solutions? Contact our technical team on 01462 421333 to discuss your requirements today. Alternatively, email our team on firstname.lastname@example.org.