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Ted Mooney, P.E. RET
Pine Beach, NJ
The authoritative public forum
for Metal Finishing since 1989
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Strip Nickel Chrome from Plating Racks
Q. We are a zinc die caster/Plater (same facility), and use nitric acid to strip our built-up plating racks. The spent nitric is being sent off site. I have read an article that suggests using an "Ultrafilter"loop to remove the heavy metals, and prolong the life of the nitric, or can reduce it's composition of heavy metals; than it can be disposed of in a more effective method. This makes sense since it is the heavy metals that are causing the classification that makes the nitric such a problem.
First question, is anyone using this technique, and if not, does it make sense?
Academy - Edison,New Jersey
2000
A. Joseph,
You did not mention what type of plating you are doing but, since you are using Nitric Acid to strip your racks I am assuming you are doing Nickel- Chrome plating.
Diffusion Dialysis systems has been effective in recovering nitric acid from these processes. You are correct in stating that the resulting waste stream is more easily waste treated.
- Chicopee, Massachusetts
2000
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Ed. note: Readers may be interested in thread 2579, "Waste Treat Nitric Acid Nickel Strip"
Q. Dear Sirs:
I need to strip nickel-chromium layers of 316 stainless steel contact tips of plastisol coated racks. I would appreciate a formulation for immersion an electrolytic stripping. Thanks in advance.
- Santiago, Chile
2002
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A. Hello ! Oscar Infante,  Popatbhai B. Patel electroplating consultant - Roseville, Michigan 2002 A. For immersion stripping nitric acid at 50 - 75% by vol will dissolve the nickel and under cut the chrome. Electrolytic strippers are based on ammonium nitrate with buffers and activators and available as proprietary processes.  Geoffrey Whitelaw - Port Melbourne, Australia 2002 |
Multiple threads merged: please forgive chronology errors :-)
Plating rack stripper
Q. Can anyone give me a good way to strip old silver and nickel plating from my plating racks. Racks are stainless steel.
Jerry Hannibal- Beverly, Massachusetts
2002
A. Nitric acid (50-70% by volume) will do this job. Good fume extraction is essential.
Geoffrey Whitelaw
- Port Melbourne, Australia
2002
Q. We are having nickel chrome plating process. I would like to know is there any way chemically to remove the plating deposits on open contact parts of jig fixtures?
Sandip Sanagar- Nashik, Maharashtra, India
September 21, 2019
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