| Chromate
Conversion Coatings
Chromate conversion offers a cost effective non-electrolytic
process for coating aluminium resulting in excellent corrosion
resistance, a good pre-paint finish and good adhesion qualities.
The surface thickness of an Alocrom coating is about 2µm
thick. We offer 3 chromate conversion processes, Alocrom 100,
1000 & 1200 as detailed below.
Alocrom
100
Alocrom 100 offers excellent corrosion resistance and is typically
used in the food and water processing industries because it
contains no hexavalent chromium. Alocrom 100 typically produces
an iridescent blue/green finish.
Alocrom
1000
Alocrom 1000 produces a clear chemical film on the surface
of the aluminium and offers excellent electrical conductivity.
Whilst the Alocrom 1000 process utilises hexavalent chromium
none of this is detectable in the final dry surface finish
if the process is carried out in accordance with manufacturer’s
guidelines. We offer a suitable alternative for customers
that require a wholly non-chromate
conversion.
Alocrom
1200
Alocrom 1200 produces a gold coloured coating which offers
good electrical conductivity and corrosion resistance and
is the most common Alocrom finish requested by our customers.
Whilst the Alocrom 1200 process utilises hexavalent chromium
none of this is detectable in the final dry surface finish
if the process is carried out in accordance with manufacturer’s
guidelines. We offer a suitable alternative for customers
that require a wholly non-chromate
conversion.
Service
Outline
The table below details the relative properties of Alocrom
100, 1000, & 1200:
Property |
Alocrom
100 |
Alocrom
1000 |
Alocrom
1200 |
Colour |
Iridescent
Green |
Clear |
Gold |
Conductivity |
|
|
|
Corrosion |
|
|
|
| Length |
910mm
(3') |
1820mm
(6') |
1820mm
(6') |
| Width |
457mm
(1.5') |
457mm
(1.5') |
457mm
(1.5') |
| Depth |
910mm
(3') |
910mm
(3') |
910mm
(3') |
| Standards |
-- |
DEFSTAN
03-18 Clear MIL-C-5541 Class 3 |
DEFSTAN
03-18
MIL-C-5541 Class 1 |
|
