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Plating and finishing kovar

I am packaging an electronics module using kovar. The package will be hermetically sealed. Some of the connectors are to be laser welded to the package while others are to be soldered/brazed. What type of plating will be required such that the soldered/brazed connectors can be assembled properly. Will kovar require any special finish to prevent corrosion?

Doug Barker
ITT Industries - Annapolis Junction, Maryland, USA

Depending upon the conditions to which the part will be exposed, you might need as much as 4 - 6 tenths of Watts nickel, 3 or 4 tenths of a mil of cadmium, then Olive drab chromate.

0.0003 inches of Watts or sulfamate Nickel should be the underlayment for the solder.

Tom Pullizzi
Falls Township, Pennsylvania

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