Inert anodes are used when you do not want the anode to dissolve, or more
precisely, when you do not want the metal in the plating solution to be
supplied by the anode (electrons still flow). Inert titanium or tantalum
(coated with platinum) anodes have long been used in gold plating baths
(obviously because anodes made of solid gold would have to be 99.999% pure,
be prohibitably expensive, and would just not stay around very long...).
Inert anodes have more recently been used in copper plating, perhaps because
copper anodes sometimes supply too much copper to the solution and copper
concentration in the plating bath tends to rise (esp. when panel plating).
I suggest to Joseph that he talk with Atotech, either in the U.S. or Europe.
Other suppliers of plating chemistry and anodes should also be able to offer
advice and assistance.
Patty
Patricia J. Goldman
PPG Industries, Inc.
412-492-5516
[log in to unmask]
-----Original Message-----
From: Timothy Reeves [mailto:[log in to unmask]]
Sent: Thursday, March 02, 2000 8:41 PM
To: [log in to unmask]
Subject: Re: [TN] Inert anode options/technology
I must be behind the times for not knowing what this is. I can only guess
that either "inert"
or "anode" is a euphemism, since by definition, inert means not chemically
reacting, and anode means the electrode being oxidized (donating electrons)
in electrochemical reaction.
Timothy Reeves
ECD Circuit Board Division
13626 South Freeman Road
Mulino, OR 97042
[log in to unmask]
(503) 829-9108 (800) 228-8198 FAX (503) 829-5482
> ----------
> From: <Joseph M. Webb>
> Sent: Thursday, March 2, 2000 13:33
> Subject: Inert anode options/technology
>
> Fellow TechNetters,
>
> Could any of you learned people (Techizens?) point me in the direction of
> definitive sources of information on the application of inert anodes in
> acid
> copper plating applications? I have been evaluating some technologies, but
> a few
> "quirks" have arisen that are outside of the normal ken, and I could use
> some
> help in understanding those.
>
> Periodicals, articles/presentations and experts (User or Supplier) are all
> appreciated.
>
> Thank you in advance!
>
> Joseph Webb
> TET Halco
>
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