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plating, anodizing, & finishing Q&As since 1989




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Want formulation for phosphating solution

2004

I want to know a simple iron phosphating formula such as % phosphoric acid, zinc oxide and accelerators. thanks.

Mohammad Hosein Bayat
paint - Qazvin, Iran

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2004

Hello, Mr. Bayat. I would suggest that you study the metal finishing journal literature of about 20 years ago, and expired patents, of which there are hundreds on this subject. There are also excellent books on this subject.

There is nothing wrong with seeking such information so that you can manufacture and distribute your own phosphatizing chemicals, but successful formulations are actually rather complex, and printing detailed formulation information on this forum from semi-anonymous people could mean inadvertent dissemination of trade secret info. Sorry, but we can't print detailed formulation info -- although we would be very happy to reference any published info that anyone provides.

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

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2004

Like always Ted is right. But very simple and not so bad processes exists. Just immerse your objects (iron or low alloyed steel) in solution of 15 gm phosphoric acid/20 gm tannic acid/1 lit water (tannic acid can be omitted). After that, dry it without rinsing and then you must lacquer or wax it.

Good luck!

Letter 31345 is something for you Mohammad. Good luck!

Goran Budija
- Cerovski vrh Croatia