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Low Resistance Coating on Aluminum for Millimeter-Wave RF Applications

I would like some info regarding a low resistance plating/coating on 6061-T6 aluminum parts used for millimeter-wave RF applications (not exposed to outdoor elements). We are currently using a minimum thickness electroless nickel (.1 microns) and I was delegated the task of finding a cost effective alternative. I have asked the RF engineers what their requirements were and why they chose EN plating, and was told that they wanted a highly conductive, corrosion resistant finish that doesn't wear out with hand contact (during assy/test). Doesn't an Alodine (chemical film) meet or exceed this requirement as far as surface resistivity is concerned?

Can you tell me what the surface resistivity is for Electroless Nickel (ASTM B733,Type II, SC0, Class 1) coating vs. Chemical Film on Aluminum Alloy 6061-T6? What is the cost differential?

Fidel A [surname deleted for privacy by Editor]
- Santa Clara, California, USA
2001

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