Alocrom replacements (Non hexavalent Chromate conversion coatings)


Conversion Coating – Non-hexavalent Chromate Alocrom replacements

Poeton has invested a huge amount of R&D resource over the last 7 years evaluating and perfecting the application methods of the Alocrom alternatives, such as: Surtec 650V, Iridite NCP, Socomore TCS PACS and Lanthane.

Each of these alternatives has pros and cons and none of them give the full level of protection that is present with Alocrom. Critically, with these treatments, the application process is not as easy or as forgiving as using Alocrom/Alodine. This is why for each of these treatments our R&D department has developed unique processing parameters and methodologies to ensure each treatment can be applied effectively and repeatability to each aluminium alloy.

Under the Military specification MIL-DTL-5541, type ll covers the chromate conversion coatings free from hexavalent chrome.

Please contact us for more details on the current alternatives.

Materials Processed:

Aluminium Alloys

Tank sizes: Gloucester

1.5m x 1m x 1m

Tank sizes: Cardiff

1m x 1m x 1m

Tank sizes: Poland

0.45m x 0.45m x 0.9m

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

Electrically conductive

Corrosion icon - acid spilling on to rectangle

Corrosion protection

Blue rectangle showing growth on top

Thin film, no dimensional change

Blue paint brush icon

Good paint adhesion

Square icon with cracks replicating fatigue

Minimises the fatigue loss, compared with anodising techniques.


Conductive spot faces

Fine tolerance machined parts

Aerospace painted components

Alocrom replacements (Non hexavalent Chromate conversion coatings)