12 8.
Due the thinness the layer, the poor electrical conductivity nickel is
insignificant.4. The parts are immersed aqueous passivation emulsion.4 The Specific Resistance and Conductivity Various
Materials
Table 4.3
.1 Silver
The conductivity silver excellent, better than gold fact.
This surface protection used for aggressive environments.5
Tin 0. This can be
very important, especially for small currents and low voltages.023 43.028 36
Gold 0.7.7.069 14.3 Nickel
A 5-pm layer nickel applied protect large-surface parts, such earth
panels. brownish
sulphide layer easily develops its surface.2 Gold
The finest surfaces are created with gold plating.016 61
Zinc 0.067 15
Nickel 0.21:
176 ____________________________________________________________
Material Specific resistance Conductivity in
Ohm mm2 m
in Ohm mm2
Aluminium 0. This
surface protection sufficient for almost all industrial connectors
applications. Silver produces moderate diffusion
barrier.061 16.017 58
Brass (CuZn40) 0. The electrical
conductivity gold significantly less than that silver, but due its
constant contact resistance, used special applications.7. The brass contacts are first
plated with 3-pm nickel layer (diffusion barrier) then with 2-pm gold
layer the contact area.
4. The contacts are silver-plated,
with layer thickness pm.5
Copper 0.7.
4.
4.5
Silver 0
