Electroplating
The definition of Electroplating
When
electroplating, the coating or other insoluble as positive pole, the metal
to
be electroplated as negative pole, the positive ion of metal coating become
electroplating coating. in order to exclude the disturbance of other positive ion
and even , strong coating,
it need electroplate liquid with metal cation to keep
the concentration of metal
cation.The purpose of
electroplating is to electroplate
metal coating on base material to change the
surface propertyof base material .
Electroplating can strengthen metal corrosion
resistance, hardness, abrasive resistance,
electrical conductivity, unctuosity, heat
resistance and good surface.
The factor of
electroplating
1. Ngative pole: the
part need to be plated
2. Positive pole:
if it is soluble positive pole, it is metallic coating. If it is
insoluble
positive pole, it is mostly precious metal (platinum; iridium oxide)
3. Electroplating
liquid: the electroplating with metal ion.
4. Eectroplating
tank: the tank can store electroplating
liquid. The strength,
anti-corrosion, temperature resistance will be considered.
5. Rctifier: the
equipment provide direct-current main.
The base working
procedure of electroplating
Polishing—hanging – degreasing—washing— ectrochemical
polishing or
chemical polishing —acid pickling—preplating—electroplating—
washing
—postprocessing— washing —drying—taking down— inspecting and packing
The purpose of
electroplating
1. copper plating
: use as base material to improve adhesive ability of coating
and anti-
corrosion.
2. nickel plating：use as base material or as appearance to improve anti-corrosion
and abrasive resistance.
3. gold plating : to
improve conductive contact resistance and improve
signal transmission.
4. palladium
plating : to improve conductive contact resistance and improve
signal
transmission.
5. tinplating: to
improve welding capability.
