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.
Due the thinness the layer, the poor electrical conductivity nickel is
insignificant.7.7.21:
176 ____________________________________________________________
Material Specific resistance Conductivity in
Ohm mm2 m
in Ohm mm2
Aluminium 0.067 15
Nickel 0.7.069 14.
4.12 8. This
surface protection sufficient for almost all industrial connectors
applications.5
Tin 0.5
Silver 0. The parts are immersed aqueous passivation emulsion.
This surface protection used for aggressive environments.7.061 16.1 Silver
The conductivity silver excellent, better than gold fact. This can be
very important, especially for small currents and low voltages. The contacts are silver-plated,
with layer thickness pm.4 The Specific Resistance and Conductivity Various
Materials
Table 4. brownish
sulphide layer easily develops its surface.2 Gold
The finest surfaces are created with gold plating.028 36
Gold 0.4.023 43.016 61
Zinc 0.
4. Silver produces moderate diffusion
barrier.
4.3 Nickel
A 5-pm layer nickel applied protect large-surface parts, such earth
panels.5
Copper 0.3
.017 58
Brass (CuZn40) 0
