5
Copper 0.
Due the thinness the layer, the poor electrical conductivity nickel is
insignificant.21:
176 ____________________________________________________________
Material Specific resistance Conductivity in
Ohm mm2 m
in Ohm mm2
Aluminium 0.
4.
4.5
Silver 0.017 58
Brass (CuZn40) 0. brownish
sulphide layer easily develops its surface.
This surface protection used for aggressive environments.3 Nickel
A 5-pm layer nickel applied protect large-surface parts, such earth
panels. The electrical
conductivity gold significantly less than that silver, but due its
constant contact resistance, used special applications.023 43.7.4.7. This
surface protection sufficient for almost all industrial connectors
applications.028 36
Gold 0.
4. The parts are immersed aqueous passivation emulsion.061 16. Silver produces moderate diffusion
barrier.7.3
.067 15
Nickel 0.016 61
Zinc 0.12 8.5
Tin 0. This can be
very important, especially for small currents and low voltages. The contacts are silver-plated,
with layer thickness pm. The brass contacts are first
plated with 3-pm nickel layer (diffusion barrier) then with 2-pm gold
layer the contact area.4 The Specific Resistance and Conductivity Various
Materials
Table 4.1 Silver
The conductivity silver excellent, better than gold fact.7.069 14.2 Gold
The finest surfaces are created with gold plating
