7.3 Nickel
A 5-pm layer nickel applied protect large-surface parts, such earth
panels.7.5
Copper 0. The brass contacts are first
plated with 3-pm nickel layer (diffusion barrier) then with 2-pm gold
layer the contact area. The electrical
conductivity gold significantly less than that silver, but due its
constant contact resistance, used special applications. The contacts are silver-plated,
with layer thickness pm.067 15
Nickel 0.023 43.4. brownish
sulphide layer easily develops its surface. This
surface protection sufficient for almost all industrial connectors
applications.4 The Specific Resistance and Conductivity Various
Materials
Table 4.5
Tin 0.
4.061 16. Silver produces moderate diffusion
barrier.1 Silver
The conductivity silver excellent, better than gold fact.
4.
Due the thinness the layer, the poor electrical conductivity nickel is
insignificant.
This surface protection used for aggressive environments.12 8.
4.3
.016 61
Zinc 0.21:
176 ____________________________________________________________
Material Specific resistance Conductivity in
Ohm mm2 m
in Ohm mm2
Aluminium 0.2 Gold
The finest surfaces are created with gold plating. This can be
very important, especially for small currents and low voltages.7. The parts are immersed aqueous passivation emulsion.5
Silver 0.017 58
Brass (CuZn40) 0.028 36
Gold 0.7.069 14
