Nickel is plating onto pvc plastisol coated plating racks
May 31, 2009
dear sir we are facing the problem of depositing nickel on pvc coated jig in ABS plant .kindly let us know the reason (is this is problem of plastisol or something else) and solution.Jyoti Kamboj
manufacturer - Delhi, India
June 18, 2009
I would say either the coating is thin enough to allow a little attraction, and allowing the rack to become "encapsulated" with plate, or there are pinholes in the plastisol. A spark tester will demonstrate if there are voids in the coating, and their location. There is also the remote possibility that the plastic was somehow made "plateable", but this seems pretty far-fetched...G. Brackett III
June 20, 2009
We found that we would get 1-2 years of use out of a rack before it started to plate. Normally it happened in an area that had been roughed up or abraded-IE: the smooth surface was not smooth any more.
We would strip and re plastisol the rack in house. Some times we would use a couple of layers of 1" platers tape to get a bit longer life out of it. Now, there are vinyl patch kits available or you can try the vinyl for pliers handles that can be bought in some auto parts stores and some big box stores. It will extend the useful life of the rack until you can find time or money to just recoat the rack.
- Navarre, Florida
June 23, 2009
We had trouble with a polypro tumbler barrel plating in EN. The problem turned out to be poor rinsing of our parts. The part were ground prior to plating. Fines trapped in a lip on the parts "seeded" the plating barrel, and we got patches of nickel on the more porous parts of the barrel where the metal fines got trapped.Michael Costello
- Grand Junction, Colorado, USA
July 3, 2009
Jyoti, You give us your problem but do not tell us how you got there! It seems to me like the Plastisol jig is becoming suitable for electrodeposition, but the reasons for it are unclear. It could be that the Plastisol has started to break down and is not offering the insulation to the jig that it should, or it could be that you are using the jig in the ABS activation process and as a consequence you have also activated the jig.
The remedies are slightly different for either cause. The initial thing is that you need to strip down your jigs and recoat them. This will solve the problem in the short term. If you are using the jigs to activate the ABS, stop doing so! This will entail you buying or making more jigs specifically for the activation process. You will then need to find a way of transferring the activated ABS parts to other jigs that will not take up metallisation; this could be a tricky step, but since we don't know what you are doing, we cannot offer any guidance from here in.
R&D practical scientist
Chesham, Bucks, UK