Craft · 6 pages · 12 min
How rust-bluing is a controlled corrosion
Rust bluing grows an even rust, then converts it to a dark adherent oxide and oils it.
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From the opening
Rust bluing is a finish made by letting steel rust on purpose, under control, and then converting that rust into a thin dark oxide instead of leaving red flakes. The layer is still corrosion of the iron, only it is even, clung to the surface, and usually soaked with oil. The opening covers red rust is grown on purpose, boiling pushes it toward magnetite, and oil in the oxide does the sealing.
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Inside
- Red rust is grown on purpose
- Boiling pushes it toward magnetite
- Oil in the oxide does the sealing
- It is not paint or stainless
- Where the idea stops applying
- A distinction worth keeping
Sources
- Slow rust bluing of steel
- Conversion of red rust toward magnetite