How strong is the corrosion protection of black oxide?

The corrosion protection of a black oxide finish is limited and usually only provides moderate protection against rust. Quick black oxide creates a thin, black oxide layer on the surface of the metal, which protects against corrosion to some extent, but is not as effective as a thicker, industrial black oxide or coating.

Factors that influence corrosion protection:

1. Thickness of the layer: as the oxide layer created by black oxide is relatively thin, it only provides superficial protection.
2. Environmental conditions: In humid or aggressive environments, such as in salty air, the protection provided by black oxide is often inadequate and can fail relatively quickly if the surface is not given additional treatment.
3. Post-treatment: Corrosion protection can be significantly improved if the blackened surface is treated with a suitable anti-corrosion oil after application. This post-treatment seals the surface and protects it from moisture and other corrosive influences.

Summary:

Without post-treatment, black oxide only offers limited corrosion protection and is mainly suitable for decorative or temporary applications. For long-term protection, especially in demanding environments, post-treatment with oil or another protective coating is required.