52069

Dyes for Acid Copper bath

April 29, 2009

Some one could let me know what dyes used in sulfuric acid csolution for Acid cu bath.
Thanks a lot

Woo Jerry
employee - Guangdong, China

There are several known organic dyes, which can help to improve the levelling:

Janus Green B (Diethyl Safranine Azo Aniline), Safranine T, Janus Black R, Janus Blue B etc. They can be obtained from Sigma-Aldrich. In any case they must be of high quality.

But it's quite hard to formulate good acid cu additives, you also need MPS, DPS, UPS, a well balanced mixture of special surfactants (incl. block copolymers), etc.

In your case I would contact Raschig company, as they supply many of the needed specialties.

Good luck!

Martin Michel
- Berlin, Germany

I had never heard of dyes being used in a copper plating bath, Jerry. I thank Martin for alerting me that, apparently, the brighteners used in acid copper can be dyes.

Ted Mooney, P.E.  finishing.com Brick, New Jersey