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"Brown substance floating in Pb-Free Tin Plating Solution"
April 4, 2016
Q. Good day. I am a supplier of tin plating chemicals. One of my customers is experiencing occurrence of brown substance in tin plating solution. This brown oily substance looks like a grease floating at the top layer. Although they don't have quality issue (yet), I would like to know if anyone here has an idea about this occurrence. Thanks.
I will highly appreciate inputs.
employee - Manila, Philippines
April 7, 2016
A. Hello Irene, I would have your customer filter a small amount of solution through filter paper in the lab. You can get a better look at the substance then. Does the tank have any hoists above it that could be leaking grease or oil? There is also a tin bath additive that could have been added in excess. I would "skim filter" the surface of the solution, analyize for the additive, change filter tubes, and see if the problem re-occurs. Filter tubes should be leached with hot DI water, or 10% sulfuric acid (only if the bath is a acid tin sulfate bath). Also rule out any cause of grease getting into solution.Mark Baker
Process Engineering - Phoenix, Arizona USA
April 9, 2016
A. Good day Irene.
Aerotek Mfg. Ltd. - Whitby, Ontario, Canada
April 9, 2016
A. Hi Irene
A. I had similar issues in my continuous plating tin and tin/lead tanks. We utilized skimmers to remove the substance and then changed the antioxidant we were using. This completely solved the issue. I would speak with your supplier to see what options you might have. If you are making your own I would start with that.Ron Hupe
- Beaumont, California, USA