7. The parts are immersed aqueous passivation emulsion.023 43.028 36
Gold 0.4. This can be
very important, especially for small currents and low voltages.016 61
Zinc 0.017 58
Brass (CuZn40) 0. The electrical
conductivity gold significantly less than that silver, but due its
constant contact resistance, used special applications.21:
176 ____________________________________________________________
Material Specific resistance Conductivity in
Ohm mm2 m
in Ohm mm2
Aluminium 0.5
Silver 0.4 The Specific Resistance and Conductivity Various
Materials
Table 4.1 Silver
The conductivity silver excellent, better than gold fact. This
surface protection sufficient for almost all industrial connectors
applications. The brass contacts are first
plated with 3-pm nickel layer (diffusion barrier) then with 2-pm gold
layer the contact area.7.
This surface protection used for aggressive environments.067 15
Nickel 0.
Due the thinness the layer, the poor electrical conductivity nickel is
insignificant.7.3
.5
Copper 0.2 Gold
The finest surfaces are created with gold plating. The contacts are silver-plated,
with layer thickness pm.3 Nickel
A 5-pm layer nickel applied protect large-surface parts, such earth
panels. brownish
sulphide layer easily develops its surface.12 8.061 16.5
Tin 0.7. Silver produces moderate diffusion
barrier.
4.
4.
4.069 14
