Q. We have a problem with our EN (high-P): after two to three turnovers, we have nickel balls (about 50-100 microns) forming on our parts; after one to two more turnovers it’s OK again. The bath is filtered by a 10-micron filter (6-8 times/hour). Stability and the other parameters are also OK. Can you explain this effect? N.O.
A. I must admit I have not run across this in my years in the plating industry. My only suggestions would be as follows:
My thinking is that somehow particulate matter gets into your tank and causes small nickel balls to form on the surface. In order to pin this down, I would docu-ment in detail such things as time of day, repeatability of this phenomenon, etc. Also if any of our readers have insight as to what is going on here I would love to hear from you. E-mail me at firstname.lastname@example.org.