Letter 36098

Zinc Cobalt Plating [India] 

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I'm doing Zinc-cobalt Plating over the mild steel im getting Black deposit Burning Like deposit with proper current density ( 1a/dm2- 1.5v) please guide me 2 solve the problem.

Arul
Electroplating - Bangalore, Karanataka, India

You've given us almost nothing to go by, Arul. Hobbyist or established plating shop? Proprietary process or homebrew? Barrel or rack? Have you removed a coupon after preplate and immediately before plating and completed it in a Hull Cell or another line? Have you preplated a coupon on another line and put it through this plating tank? Was the line functioning perfectly for months and stopped overnight or is this a startup that has never yet run right? The universe of possibilities remains the universe. Thanks.

 
Ted Mooney, P.E.
finishing.com Inc. - Brick, NJ

Dear Arul,
If you can be more specific about your bath, may be I can help you.
1.What is the bath Chemistry- Acid Chloride-boric Zn-Co,Acid chloride boric free Zn-Co or Non Cyanide alkalyne Zn-Co
2.Bath constituents (Do u analyse the solution?)
3.Cobalt conc.in ppm of the bath
4.Type of component u plate because the Current applied seems to be lower than required even for acid chloride bath
5.How old is your bath and what is the volume
6.what do you do for the maintanance of the bath
If you furnish all the details, I will be able to help you.

T.K. Mohan     plating process supplier  Mumbai, India

Dear sir,
the problem of black spots is due to improper deposition of cobalt.u can cantrol the same with variation in your votage of ur recitifier. I have gone through the same problem long back.

Kiran Pamkar
- Mumbai, India

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