Nodular buildup at edges with chrome plating.
A discussion started in 2009 but continuing through 2018July 14, 2009
We are an aerospace company that utilizes the services of the plating industry very frequently. We have always had trouble with nodular build up at the edges of parts when hard chroming was called for. Is there a particular type of edge prep (chamfer, radius, etc.) that we could employ to reduce or eliminate this issue?
Manufacturing Engineer - Kulpsville, Pennsylvania, USA
July 16, 2009
A. Generous radius and chamfer will help. Ultimately, you probably will have to look at shields or robbers to reduce the high current density areas.
- Navarre, Florida
July 17, 2009
- New Delhi, India
With deep regret we
sadly advise that
Asif passed away
on Jan 24, 2016
July 17, 2009
aerospace - Yeovil, Somerset, United Kingdom
July 17, 2009
A. Edge area having high current density. So normally hard chrome will built up more faster on this area.
Hard Chrome plater - - Selangor, Malaysia
I thank all of you who have responded and now I'll go to my supplier and discuss these conclusions. A little knowledge can be dangerous.Rick Ramseyer
- Kulpsville, Pennsylvania, USA
April 23, 2013
Q. Current robbing when electroplating large and small exposed areas. Can anybody give me an idea of what is current robbing? How does it influence uniformity of thickness over a large substrate? How to minimize this effect?Ravi E
- Corvallis, Oregon, USA
A. Hi Ravi. Please tell us YOUR situation. Who told you something about robbing and why? "Robbing" can be a good and deliberate thing; it can be an accidental and bad thing as a result of poor racking. In either case it involves something stealing some of the current and thereby depriving another area of current: again, this is often a good thing. What is going on in your situation?
Ted Mooney, P.E.
Pine Beach, New Jersey
January 31, 2018
"What usually happens is that you call up greater than the final thickness you require and then grind back to size".
Q. We are currently working on a piston which has an chamfer with radius on both ends. chrome plating is required till the starting point of chamfer. We have done the plating like Mr. Brian Terry suggested above. We are facing problems with blending the radii of the chamfer and the chrome plating since sharp edges are forming after grinding it to required size. We are looking for an edge polishing method to blend the radius. Please suggest any solutions to edge polish the chrome to blend it to the convex radius of 1 mm.
- Hosur, Tamil Nadu, India
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