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Can chromium be electroless co-deposited with nickel? (Ternary Ni-Cr-P deposit)




Or, better yet, quaternary Ni-Cr-Mo-P. Very little info out there on incorporating Cr into EN deposits. Does that mean it can't be done? I came across a couple of patents, but that's about it.

Kevin Simpson
Product Development - Richland, Washington, USA
March 2, 2011



March 5, 2011

According to Russian literature chromium can be electroless deposited. If you know russian language (today you can use google translator too) you can freely download many old russian books on electroplating.
One Russian formula for electroless chrome:Reductive chromium plating

chromium fluoride 17 gm
chromium chloride 1,2 gm
sodium citrate 8,5 gm
sodium hypophosphite 8,5 gm
water 1 lit
pH 8-11,temp. 85-90 °C

Can be used on copper /copper alloys.
If we must use it on steel add 14 ml acetic acid [on eBay or Amazon] and same amount of 20% NaOH.
Light grey coating that can be polished.
Treated object must be contacted with piece of zinc or aluminum-when plating starts (gas bubbles) contact can be stopped.
Solution is usable 8 hours. Dissolve fluoride, when dissolved add chloride, then citrate and hypophosphite as last.
Chromium compounds are carcinogenic, try to avoid any contact with solution!

According to:
Vansovskaya,K.M. Metalicheskie pokritya nanesennie himicheskim sposobom
Leningrad 1985.

Goran Budija
- Cerovski vrh Croatia



Russian webpage --here you can find many old download free russian books on electroplating

www.galvanicrus.ru/lit/books.php

Goran Budija
- Cerovski vrh Croatia
March 8, 2011




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