Krishnan,
Iodine in itself can't dissolve gold. The solution we used to buy was a proprieatry one, consisting of Potassium Iodide-Iodine. Worked best at +60 Centigrades. Note that thinfilm gold and homogenous gold isn't the same. The later one can not be dissolved readily by the said solution. Time for stripping is dependent on some factors, but let's say approx 1um per minute.
/Inge
From: Krishnan (Radhakrishnan) Chezhian
Sent: den 21 July 2010 11:19
To: TechNet E-Mail Forum ; Inge
Subject: Re: [TN] Removing gold and leaving nickel unaffected
Hi Inge,
I am interested to know more about this non-cyanide gold stripping using Iodine, can you give me more details of the stripper. Is it just Iodine or is it a proprietary iodine based stripper, what temperature does the solution have to be and the how long does it take to strip.
Thanks,
Krishnan
On Wed, Jul 21, 2010 at 3:16 PM, Inge <[log in to unmask]> wrote:
Rudy,
we have stripped gold on thin film substrates for decaces with Iodine without noticing any aggression to Nickel.
/Inge
----- Original Message ----- From: "R Sedlak" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Monday, July 19, 2010 11:42 PM
Subject: Re: [TN] Removing gold and leaving nickel unaffected
Bev:
I am gonna have to dig deep on this one, BUT my long distant memory tells me that there is a gold stripper based on Iodine! Key issue may be does it attack Nickel? Lemme dig in here. Or would Iodine be "beyond the RIM"? I, of course, would prefer to give you a stripper which was "nothing but net".
Rudy
--- On Mon, 7/19/10, Bev Christian <[log in to unmask]> wrote:
From: Bev Christian <[log in to unmask]>
Subject: [TN] Removing gold and leaving nickel unaffected
To: [log in to unmask]
Date: Monday, July 19, 2010, 11:38 AM
TechNetters,
is there a way of chemically removing an ENIG gold layer and not attacking the underlying nickel without using cyanide?
Bev
RIM
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