Mike,
Thanks for the help.
Actually it is a one panel test bath that I made up 2 years ago. I
introduced only a few panels with dry film to the bath. I did not carbon
treat but I don't think organic contamination is the case. Sometimes bath
stay idle for long time and then I need to do long time dummy plating before
start testing again. It has been running good since last dummy plating.
Control of additives are done by CVS to measure brightener and leveller
separately. When I asked about iron concentration, readings was good with
brightener and leveller. The CVS and Hull Cell did not show anything
unusual. Later, I started to read high brightener and low leveller
concentration. Now readings are normal after dummy plating and problem seems
to be solved.
I didn't understand why brightener concentration increased and CVS did not
show anything. I know that CVS is a very sensitive device and readings can
be erroneous. But we run same procedure of CVS for also production bath and
readings are stable.
Best regards,
Sofu
-----Original Message-----
From: Barmuta, Mike [mailto:[log in to unmask]]
Sent: Monday, March 17, 2003 4:14 PM
To: 'TechNet E-Mail Forum.'; 'Sencer Sofuoglu'
Cc: Barmuta, Mike
Subject: RE: [TN] Iron for Electrolytic Copper Plating
Sofu: Iron contamination at 70ppm will not cause LCD dullness. It will
create dull LCD deposits in the 800-1000ppm range and above.
If the main constituents are in balance, I would suspect organic
contamination, anode polarization or insufficient brightener.
A couple of things to consider:
1.How do you verify the brightener is at the proper concentration? Most
brightener systems are multi-component and must be kept in balance. Are you
using CVS, Hull cells, chromatography? Obviously low brightener will cause
dullness. You can usually 2X the brightener concentration without affecting
the deposit.
2.Take a look at your anodes, the film should have a black uniform velvety
appearance. The anode bags should be clean and free of any build up on the
bottom. Make sure the anode material is of sufficient size and not de-plated
done to nothing. You don't want anode nuggets plated down to the size of pea
gravel or slab anodes that look like spears or dog bones.
3. Check your chloride PPM, low chloride as well as high chloride will cause
dullness. The high chloride will also show up as a white-gray film on your
anodes.
4. Are you properly(off line)batch carbon treating the bath and not just
running it thru some carbon packs in your filter chamber?
There are many things that will cause LCD dullness those mentioned above are
some of the most common.
Regards
Michael Barmuta
Staff Engineer
Fluke Corp.
Everett WA
425-446-6076
-----Original Message-----
From: Sencer Sofuoglu [mailto:[log in to unmask]]
Sent: Friday, March 14, 2003 12:39 PM
To: [log in to unmask]
Subject: [TN] Iron for Electrolytic Copper Plating
Hello,
We see some dullness at low current density area and I consider that one of
the reasons can be iron concentration. Current concentration is 70ppm. What
kind of Iron concentrations do you control your bath? What would be the
result of high or low iron concentrations? Any comment appreciated.
Regards,
Sofu
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