7.7.069 14. brownish
sulphide layer easily develops its surface.067 15
Nickel 0. The electrical
conductivity gold significantly less than that silver, but due its
constant contact resistance, used special applications.5
Tin 0. The contacts are silver-plated,
with layer thickness pm.12 8. This can be
very important, especially for small currents and low voltages. This
surface protection sufficient for almost all industrial connectors
applications.028 36
Gold 0.2 Gold
The finest surfaces are created with gold plating. The brass contacts are first
plated with 3-pm nickel layer (diffusion barrier) then with 2-pm gold
layer the contact area.016 61
Zinc 0.023 43.4.3
.
4.7.4 The Specific Resistance and Conductivity Various
Materials
Table 4.
4.1 Silver
The conductivity silver excellent, better than gold fact. Silver produces moderate diffusion
barrier.017 58
Brass (CuZn40) 0.
Due the thinness the layer, the poor electrical conductivity nickel is
insignificant.5
Copper 0.
4.
This surface protection used for aggressive environments.061 16.21:
176 ____________________________________________________________
Material Specific resistance Conductivity in
Ohm mm2 m
in Ohm mm2
Aluminium 0.3 Nickel
A 5-pm layer nickel applied protect large-surface parts, such earth
panels.5
Silver 0. The parts are immersed aqueous passivation emulsion.7
