Letter 5073

Which type of silver plating process? 

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I have to silver plate Aluminum 6160-T651 and Invar 36 to be used in high frequence telecommunications equipment. Should the base metal be plated with electroless nickel or copper and why? Will these migrate through the silver? I had parts that came in certified QQ-S-365D. The chromate makes them unusable.

1) It there an in-house test we can do to tell which parts have the chromate and which have bare silver? 2)Can we strip the parts and re-plate them to the same desired finish?

Is there a protective finish that will degrade the conductivity less than chromate? Is matte finish more conductive than the bright and semi-bright?

Steve Bowman
- Palo Alto, Ca 94304

Dear Steve

For high frequence telecomunication parts a matte finish is better than a bright or semi bright. The best is a silver bath without any organics or metallic (except silver naturally) components. The deaden of high frequence current strongly depends on the conductivity of the surface so any passivation you use will increase deaden. Regards Marcus

Marcus Hahn
- Sachseln Switzerland

Hello Marcus Hahn,

Just want to know if the silver plating QQ-S-365D Type3 GradeB can have a nickel undercoating? If so, what is the preferred thick?

Thanks and best regards,
Tony

Antonio Bonagua Mayo
I.E.T.I - Manila, Philippines

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