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Formula for Bondal dip / Zincate dip (for plating on aluminum)

Q. What is "Russian Salt" as suggested by Baris Sen below to make Zincate solution?

Arvinda Kumar
Finishing engineer - Noida [India]
January 11, 2022

A. Hi Arvinda.

You got me curious so I re-read Baris Sen's posting and came to the conclusion that this was an auto-correct error and he surely meant "Rochelle Salt" (sodium potassium tartrate tetrahydrate) [on eBay or Amazon affil links] .

Luck & Regards,

pic of Ted Mooney
Ted Mooney, P.E. RET
Striving to live Aloha - Pine Beach, New Jersey
January 2022

⇩ Related postings, oldest first ⇩

Q. Hi, I need formulation for Bondal dip solution for electroplating pre-treatment of aluminium.

Aftab Jahangir
Aftab Jahangir
chemist - Karachi, Pakistan
May 28, 2008

May 28, 2008

thumbs up signHi, Aftab. I think there is a misunderstanding here. Bondal is a trade name for a proprietary mixed-metal zincating process. No one can give you the formulation because it is a trade secret. If you want Bondal you must buy it from Macdermid. That does not, of course, prevent you from using straight zincate compounds or from attempting to develop your own mixed metal process as long as it doesn't violate international patents. Good luck.


Ted Mooney,
Ted Mooney, P.E.
Striving to live Aloha - Pine Beach, New Jersey

simultaneous replies

A. There is no good visual check for a zincate step, so I would definitely go with a proprietary double dip zincate. Home brew may be cheaper, but what do you do when it fails? You do not have any tech service help. Also, there are minor additives in it that you will not have in a home brew.

James Watts
- Navarre, Florida
May 30, 2008

Q. Ok thanks. Is there any possibility to galvanize^electroplate aluminium parts directly?

Aftab Jahangir
Aftab Jahangir
chemist - Karachi, Pakistan
June 1, 2008

A. Aftab, an interesting question -- can you directly plate aluminium. Conventional electroplating says NO and this is correct, because aluminium has a very tenacious oxide layer that forms incredibly quickly and prevents good adhesion. BUT I have successfully deposited nickel directly onto aluminium using no pretreatments whatsoever, by using "jet plating". However, this is a laboratory "trick" and I don't think it would be commercially viable.

trevor crichton
Trevor Crichton
R&D practical scientist
Chesham, Bucks, UK
June 3, 2008

simultaneous replies June 4, 2008

A. Sorry, Aftab, I think you misunderstood me. I was trying to say that Bondal is a proprietary product, it is not a generic name. Just as you cannot build a Mercedes Benz yourself, but you can build an automobile yourself, you cannot formulate Bondal yourself, but you can formulate zincate yourself if you must. Zincate is basically zinc dissolved in sodium hydroxide, with or without cyanide. You can and preferably should buy this from a supplier as James Watts advises, but you can formulate it yourself if you must.

It is possible under some limited circumstances to plate directly onto aluminum without zincate, but it is difficult and specialized, and that would be the wrong answer to your question. Good luck.

Ted Mooney,
Ted Mooney, P.E.
Striving to live Aloha - Pine Beach, New Jersey

A. Brush platers can plate on some aluminum without a zincate step, but it is limited to small parts and is normally one at a time and with no bad geometry like corners of a metal box.

James Watts
- Navarre, Florida
June 4, 2008

March 17, 2016

A. Not a Bondal dip formula, but Sodium Zincate formula is:
For 10 Liter
~600 gr Caustic
~100 gr Zinc Oxide
~250 gr Russian SaltRochelle Salt
10 gr Iron Chloride

You can easily use this formula instead of Bondal dip ...
Have a nice day ...

Baris Sen
Ader Savunma - Ankara, Turkey

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