Chromic Acid Anodising


Anodising – Chromic Acid Anodising

Chromic Acid anodising provides a thin layer that is typically 1–2µm. It is typically used for its anti-corrosion properties and as a pre-treatment for paint systems. Chromic acid anodising excels compared to other anodising techniques when the fatigue strength of the aluminium substrate needs to be maintained.

Poeton offer this process to all major Aerospace and military specifications. However, chromic acid anodising is being phased out of use due to the REACH regulations. Poeton’s R&D department have worked extensively for many years reviewing the alternatives and we can offer both Tartaric Sulphuric Acid Anodising (TSA) or Thin Film Sulphuric (TFS) as alternatives. Please contact the technical team at Poeton for further advice on treatments that meet the latest REACH regulations.

For advanced anodising solutions see Apticote 300.

Materials Processed:

Aluminium Alloys

Tank sizes: Gloucester

2m x 1m x 1m

Tank sizes: Cardiff

3m x 1m x 1m

Tank sizes: Poland

1.2m x 1m x 1.2m

The tank sizes shown above are approximate sizes only. If you have a larger part then please contact us as we may still be able to help.


Electrical icon

Electrical Insulation

Corrosion icon - acid spilling on to rectangle

Corrosion protection

Blue paint brush icon

Good paint adhesion

Square icon with cracks replicating fatigue

Minimises the fatigue loss, compared with other anodising techniques.


Military explosive applications

Structural aerospace components


Electrical component casing

Chromic Acid Anodising