We
offer Chromic Anodising using Chromium Trioxide in accordance
with Def Stan 03-24.
Overview: The
chromic anodising process is used where a high resistance to
corrosion is required, where crack detection is a subsidiary
requirement, for the treatment of aluminium assemblies where
there must be no corrosion risk from trapped electrolyte (a
common problem with sulphuric anodising) and for the production
of opaque enamel-like self coloured grey/black
finishes for decorative use.
| Standard |
Thickness
|
| DTD
910 |
2µm
|
| Def
03-24 |
2µm
|
| Def
151-2 |
2µm
|
| Mil-A-8625
Type 1 Class 1 |
2µm
|
Key
Strengths: There are a number of key features that
make chromic anodising key for particular applications:
- Ideal for
castings
- Minimised
loss of fatigue strength due to anodising
- No risk
of sulphuric acid entrapment and associated post treatment
corrosion
- Ideal for
treatment of material less than 0.25mm thick
- Compatible
with explosives, propellants and pyrotechnics
Applications: Typical
applications include aerospace, defence and foritems used
in marine environments where exposure to salt is high.
Tanks: We
offer tank sizes up to 5' x 5' x 3'.
Thickness: Standard
coating thickness is 2µm.
Finish: All
chromic anodised finishes are grey but can be dyed blue or
black.
Copper: Chromic
anodising is unsuitable for alloys containing more than 5%
copper.
Jigging: Correct
jigging is essential to the resulting finish, and good jig
points are required, a consideration that should be made
at the design stage of a component. The use of loose, sliding
or intermittent contacts will result in an unsatisfactory
connection
and give rise to faults such as thin coatings, burning at
the contact points or even failure to obtain an anodised coating.
|
