We
offer Sulphuric Anodising using Chromium Trioxide in accordance
with Def Stan 03-25. For colour dying a 15% sulphuric acid
solution is used.
Overview: Ideal
for decorative applications including architectural metalwork,
consumer goods, bike parts as well as general applications
that require a clear natural finish. It is suitable for general
protective purposes and for the production of a suitable surface
for subsequent painting or adhesive bonding.
| Standard |
Thickness
|
| Def
Stan 151/1 Standard |
5-7µm
|
| Def
03-25 Standard |
5-7µm
|
| BS1615
Grade AA3 |
3µm
|
| BS1615
Grade AA5 |
5µm
|
| BS1615
Grade 10 |
10µm
|
| BS1615
Grade 15 |
15µm
|
| BS1615
Grade 20 |
20µm
|
Key
Strengths: There are a number of key features that
make Sulphuric Anodising key for particular applications:
- Wide
range of bright colours
- Electrically
insulating finish
- Ideal
for castings containing 5-7% copper or specified maximum
total of 7% of (copper + nickel + iron)
- Specified
process for components that come into contact with concentrated
hydrogen peroxide (HTP)
- Compatible
with explosives, propellants and pyrotechnics
Limitations: There
are a number of limitations associated with Sulphuric Anodising:
- Unsuitable
for items having riveted, lap or folded joints, tubes or
other items where there is a risk of electrolyte becoming
entrapped
- Not suitable
for items less than 0.25mm thick
- Not suitable
for alloys containing more than 7% copper
- Greater
risk of fatigue strength loss
- Heat
treatments must be carried out prior to anodising
Applications: General
applications. Tanks: We
offer tank sizes up to 13' x 5' x 4'.
Thickness: Standard
coating thickness is 5-7µm.
Finish: A
range of colour dyes are available.
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.
|
