Nickel/gold

With a high electric conductance is nickel/gold plating, or hard gold, useful for contactability with a low transition resistance.

It is also excellent for corrosion protection width a hardness on 160 HV.

Specifications (Datasheet)
Nickel/gold plating

Properties:

High electric conductance. Excellent corrosion protection. 
160 HV hardness. 

Appearance:

Golden, shiny surface.

Base material:     

Copper, brass, steel, stainless steel, aluminium, and tin bronze. Nickel plating serves as a barrier layer against the substrate.

Application:

Contactability. Low transition resistance.

References:

Nickel/gold plating is also referred to as hard gold as the gold has been alloyed with 0.2 % nickel or with 0.2 % cobalt.

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