Curated with aloha by
Ted Mooney, P.E. RET
The authoritative public forum
for Metal Finishing 1989-2025
-----
Bright acid tin parts not plating and turning black
September 13, 2009
We own a plating company in California.. We are having trouble with our
bright acid tin... The parts are not plating and turning black.. Can anyone
help me with this...
Owner - Fullerton, California
I do not have my trouble shooting book anymore, but I suspect that your anodes have passivated. I will also hazard a guess that your anode bags have not been changed recently. Next would be it acid content in range? Has your solution gone from clear to milky to a light creme to a dark creme color, if so contact your vendor--Two choices, dump and rebuild or go thru an expensive treatment that a few companies offer.
What is your tramp metal concentrations. Any possibility that you got some nitric acid added instead of sulfuric?
- Navarre, Florida
September 15, 2009
(No "dead threads" here! If this page isn't currently on the Hotline your Q, A, or Comment will restore it)
Q, A, or Comment on THIS thread -or- Start a NEW Thread
Q, A, or Comment on THIS thread -or- Start a NEW Thread