David,
The KI/I mix is a Gold etchant, so could the effect you've seen be the result of
access to the Gold (i.e. pinholing, lift-off, or undercut of the Nickel), rather
than an electrochemical effect?
Neal
 David Nemeth wrote:In my experience, this solution will not attack Nickel that
is not in
contact with another metal. It will aggressively attack nickel that is
sandwiched between two layers of gold (don't ask me why - go ask an
electrochemist). It will sometimes attack nickel that is on top of gold,
depending on the deposition method of the Nickel.

David Nemeth
Senior Process Engineer
Sophia Wireless, Inc.
14225-C Sullyfield Circle
Chantilly, VA
Ph: (703) 961-9573 x206
Fax:(703) 961-9576

-----Original Message-----
From: mems-talk-admin@memsnet.org [mailto:mems-talk-admin@memsnet.org]On
Behalf Of Phaneendra Medida(fabbi)
Sent: Monday, September 09, 2002 2:47 PM
To: mems-talk@memsnet.org
Subject: [mems-talk] Nickel etchant


Does this solution (KI(Potassium iodide)+I2(Iodine)+Water) Etch Nickel?

Fabbi.
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