-- The Home Page of the Finishing Industry
A website for Serious Education, promoting Aloha,
& the most FUN smiley you can have in metal finishing.
    no popups, no spam
on this site
current topics
topic 3666

Excessive consumption of palladium in POP activator


We are a Job Shop to Plating on Plastic. We have higher consumption of palladium in our Futuron activator. We believe that it can be due to contamination with Sodium-Meta-Bisulfite Our reducer contains 30 gr/liter Sodium-Meta-Bisulfite.

Then we have three counter-flow rinse that let us a dilution of 30000:1

The following step is a Pre-Dip with 30% of hydrochloric acid. Our Drag-out is 0.002 ml/sq. dm. But we don't know which is the maximum Meta-Bisulfite that can support our activator.

Can somebody help us?

Norberto G. Martin


Hello Norberto,

The palladium in the activator is present as a colloid. palladium as the ground state metal and stannous tin (keeps the palladium in solution)chloride. The Bisulfite is probable not effecting the palladium directly, but is chemically going after the tin. Is there a little sludge at the bottom of the activator? Using a little stannous chloride in the pre-dip might protect the activator. Do try this off-line first. Don't experiment with production. Three counter-flow rinses is a good thing, but is there any agitation of the rinse water (air) or parts? Might be all you need.

Note: If you're using Electroless Copper you might want to change from 30% hydrochloric acid pre-dip to a lower Normality sodium chloride type of pre-dip (health reasons).


Fred Mueller, CEF
- Royersford, Pennsylvania

This public forum has 60,000 threads. If you have a question in mind which seems off topic to this thread, you might prefer to Search the Site

ADD a Comment to THIS thread START a NEW threadView CURRENT TOPICS

Disclaimer: It's not possible to diagnose a finishing problem or the hazards of an operation via these pages. All information presented is for general reference and does not represent a professional opinion nor the policy of an author's employer. The internet is largely anonymous & unvetted; some names may be fictitious and some recommendations may be deliberately harmful.

  If you need a product/service, please check these Directories:

JobshopsCapital Equip. & Install'nChemicals & Consumables Consult'g, Train'g, SoftwareEnvironmental ComplianceTesting Svcs. & Devices

©1995-2018, Inc., Pine Beach, NJ   -   About   -  Privacy Policy
How Google uses data when you visit this site.