Hi;

I am very much interested in finding out more about this issue. I work a
great deal with ceramic substrate, which are basically Al2O3 based
multi-layer assemblies for Hybrid application. All interconnect is done
in Gold and I notice corrosion on some of the pads and not the other. It
also appears to be environmental sensitive.

So, I would appreciate if you could forward me any literature/ papers/
books reference etc. I would greatly appreciate.

Regards;

Vishnu Mathur
Ventritex, A St. Jude Medical Company

408-522-6427

> -----Original Message-----
> From: D. Terstegge [SMTP:[log in to unmask]]
> Sent: Friday, September 05, 1997 12:08 PM
> To:   [log in to unmask]
> Subject:      [TECHNET] Assy : galvanic corrosion
>
> Hello Technet,
>
> I heard that galvanic corrosion will occur on the contact area between
> gold and aluminium. Is this really a problem ? also when the gold is
> only 0.05 micron thick, with nickel underneath ?
> I'm talking here about a printed circuit board with 0.05 micron gold
> plating over nickel, where certain features make contact with an
> aluminium housing.
>
> Daan Terstegge