This surface protection used for aggressive environments. The parts are immersed aqueous passivation emulsion. This can be
very important, especially for small currents and low voltages.21:
176 ____________________________________________________________
Material Specific resistance Conductivity in
Ohm mm2 m
in Ohm mm2
Aluminium 0.5
Silver 0. The contacts are silver-plated,
with layer thickness pm.2 Gold
The finest surfaces are created with gold plating.1 Silver
The conductivity silver excellent, better than gold fact.
4.7. This
surface protection sufficient for almost all industrial connectors
applications.4 The Specific Resistance and Conductivity Various
Materials
Table 4.016 61
Zinc 0.7. The brass contacts are first
plated with 3-pm nickel layer (diffusion barrier) then with 2-pm gold
layer the contact area.028 36
Gold 0.3 Nickel
A 5-pm layer nickel applied protect large-surface parts, such earth
panels.5
Copper 0.061 16.7. Silver produces moderate diffusion
barrier. The electrical
conductivity gold significantly less than that silver, but due its
constant contact resistance, used special applications.
4.067 15
Nickel 0.4. brownish
sulphide layer easily develops its surface.
4.023 43.7.12 8.5
Tin 0.3
.069 14.
Due the thinness the layer, the poor electrical conductivity nickel is
insignificant.017 58
Brass (CuZn40) 0
