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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 SimpsonProduct 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 [affil link] 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.
- Cerovski vrh Croatia
Russian webpage --here you can find many old download free russian books on electroplating
www.galvanicrus.ru/lit/books.php
- Cerovski vrh Croatia
March 8, 2011
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