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topic 677

Plating barrels are getting plated


Q. Currently in my barrel plating line we are having some problems because the polypropylene cylinders are getting too much metal and the parts inside are coming out with low thickness (the metal supposed to be deposited on the parts is deposited on the cylinder); we are plating copper parts with a tin/lead layer using methyl sulphonic acid in the plating bath, does anyone have any suggestion on how to eliminate this problem or reduce it? thanks in advance for your valuable help.

Luis Moreno
captive plater - Jalisco, Mexico


A. I've seen this problem before. I think an easily deposited metal like tin gets the whole thing started then everything starts to plate out. Tin salts cling tenaciously to just about everything. We get it with barrels that go through multiple processes (cyanide copper, electroless nickel, gold, silver).

The only thing to do is chemically strip the metal deposit off before it gets too thick and hope that it doesn't come back.

bill vins
Bill Vins
microwave & cable assemblies
Mesa (what a place-a), Arizona 


A. Luis, Try stripping the metal out of your barrel and then look at the inside surface. You probably have millions of tiny scratches and nicks. These sites will start plating for a multitude of reasons. contact your barrel manufacturer for his recommendation on how to smooth it out. Also check your hole size. Plastic will peen over the inside edge of the hole to reduce the effective hole size. You may have to drill or ream the holes out so you can get more solution turnover in the barrel.

James Watts
- Navarre, Florida

March 28, 2013 -- this entry appended to this thread by editor in lieu of spawning a duplicative thread

Q. Dear sir,
I find here some trouble in my barrels which I use to do zinc plating on fasteners, as there is deposition of zinc on the outer surface of barrels.
Please help me to sort out the problem as required.

fasteners - Haridwar, Uttrakhand, India

April 3, 2013

A. Hi,
Clean the drum barrel in nitric acid, and rinse in clean water so are sure that's is no nitric acid left. Because I think you have many Iron contamination from the part you drumming in the plastic in the drum.


anders sundman
Anders Sundman
3rd Generation in Plating
Consultant - Arvika, Sweden

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