[log in to unmask] wrote:
>
> I need help to minimize organic contamination occuring in Microecth bath in
> pattern plating bath. The contamination is a brown, gummy material. When the
> solution is nearly to be discarded, the contamination occurs and floats in the
> surface of the bath. If the solution is not restarted, black spots on the
> surface of copper can be seen in inspection and will cause open circuit in
> etching process without correct action.
> Our microecth bath is made up of H2SO4&H2O2, using 746W(SHIPLEY CHEMICALS) as
> stabilizer. No filter pump is employed in this bath.
> Can anyone offer suggestions the eliminate this residue?
> Thanks in advance.
>
> Ji Jiancheng
>
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> ################################################################Hello,
What temperture is the micro-etch solotion operating at? Did the solution
overheat at anytime? The residue could indicate a breakdown of the
stabilizer. Is the residue soluble in any kind of solvent?(alcohol etc)
Try and retrieve some of the residue and run an IR scan to try and
determine what the compund might be.

Good luck

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