|
|
 |
Zinc
Plating: Three
automatic rack plants with a maximum process window of
3.6m x 1.5m x 0.7m. Two large automatic
barrel process plants with 1.2m cylinders.
The process solutions are alkaline non-cyanide based. Clear,
Colour and Hexavalent Chrome
Free passivation and topcoats are available. All plants
have fully automated transporters with a high degree of
process control, which includes automatic dosing of process
chemicals and additives as well as process solution temperature
and direct current control.
Benefits:
Zinc is the process of choice for a cost effect method
of achieving enhanced corrosion protection. It is also
an ideal sub-surface for final finishing.
|
Corrosion
Protection: Corrosion
protection is directly proportional to the electroplate
thickness (3-30µm according to our client's
specification). The principal protection is due
to the zincs encasement of the item, which prevents
contact with the environment. An important feature
of zinc is it’s sacrificial property,
which means that where the ferrous base of the
item is exposed to humidity for example, the
associated chemical reactions of corrosion will
affect the zinc in preference to the steel. Zinc
also provides outstanding metal distribution
and uniform covering power. The coating is capable
of accepting the environmentally friendly clear
blue trivalent chromium passivate as well as
yellow and olive drab finishes.
Wear Protection: Zinc
plating bestows an increased surface hardness
on the item with the finished hardness (100g
HV) ranging between 80-150HV. Zinc is beneficial
where items must retain their original appearance
for many years.
|
|
Corrosion
Protection
|
| |
White-h |
Red-h |
| Clear
Passivate |
20 |
100 |
| Yellow
Passivate |
70 |
150-200 |
| Hexavalent chrome Free Thick
Film |
130 |
300 |
| Olive
Drab Passivate |
150-200 |
250-360 |
| Black
Passivate |
30-50 |
120-50 |
Above
data relates to corrosion testing in accordance
with ASTM B117 procedures, 5% neutral salt spray,
and deposit thickness 8µm. Silicate post
dips and lacquers can add 100-250h to the above
values. Protection of steel substrates (red rust
corrosion) is proportional to the deposit thickness.
|
|
Value
Added Services: Zinc
plating can be used as a final finish or as a base for
post-treatments. Additional treatments can be applied
to complement the primary finish such as clear or coloured
lacquering, oil seals, wax silicate finishes, leach
and seal systems or wax emulsions dosed with corrosion
inhibitors. Post treatment applications can be applied
for functional or aesthetic purposes.
|
|
|
