Rust film

Flash rust on a chrome tube

The same pipe after cleaning

According to DIN 50 900, Part 1 (Title: Terms of Corrosion), flash rust refers to the onset of corrosion of iron or steel .

The term rust film comes from fine iron dust that rusts in the air and is deposited on objects. For example, they were created on the braking system of old railways. Metal parts around the dust source look rusted, although only the surface is covered by rust dust. Simply wiping off the dust is sufficient to remove rust.

In professional circles and normatively, rust film is referred to as a thin layer of rust on steel surfaces, which forms very quickly after blasting. It is not possible to simply wipe it off to remove rust. In order to prepare the substrate correctly (e.g. before applying a coating), blasting with hard abrasive material is required.

Colloquially, flash rust usually means a layer of rust on a surface that can be easily cleaned off. For example, extensive rust stains appear on a damaged chrome coating . The sheet steel underneath rusts in exposed areas , while the rust spreads over the chrome surface.

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1. ↑ Herbert Beneke: Lexicon of corrosion and corrosion protection . Vulkan-Verlag, 2000, ISBN 978-3-8027-2918-8 , p. 141.

Web links

• Flash rust on stainless steel surfaces (accessed on September 10, 2018)
• Flash rust / metal particles (accessed on September 10, 2018)