5
Copper 0.7. The brass contacts are first
plated with 3-pm nickel layer (diffusion barrier) then with 2-pm gold
layer the contact area.3 Nickel
A 5-pm layer nickel applied protect large-surface parts, such earth
panels.
4.5
Silver 0. This can be
very important, especially for small currents and low voltages.017 58
Brass (CuZn40) 0.1 Silver
The conductivity silver excellent, better than gold fact.023 43.3
.4 The Specific Resistance and Conductivity Various
Materials
Table 4.4. This
surface protection sufficient for almost all industrial connectors
applications.21:
176 ____________________________________________________________
Material Specific resistance Conductivity in
Ohm mm2 m
in Ohm mm2
Aluminium 0.
This surface protection used for aggressive environments. Silver produces moderate diffusion
barrier.069 14.016 61
Zinc 0.7. 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.
4. brownish
sulphide layer easily develops its surface.067 15
Nickel 0.7.2 Gold
The finest surfaces are created with gold plating.028 36
Gold 0.
4.7.
Due the thinness the layer, the poor electrical conductivity nickel is
insignificant.5
Tin 0.061 16. The parts are immersed aqueous passivation emulsion.12 8
