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Comparing Phosphating Treatments



(-----) 2004

Q. Hi, Firstly I want to know about the advantages / benefits of Phosphating (Iron,Zinc)Processes. Secondly which phosphating treatment is better (Iron, Zinc or Mn) and why? Thirdly, what are the applications of phosphating treatments (Iron, Zinc & Mn).

Muhammad Asif
Pakistan Ordnance Factories - WAH CANTT, PUNJAB, PAKISTAN
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2004

A. Hi cousin Asif. Phosphating offers "key" to help paints adhere, forms corrosion resistant conversion compounds on the surface, helps relieve anodic "hot spots", minimizes undercutting after a scratch, and probably fights corrosion a few other ways as well. Iron phosphates are the thinnest and offer the least protection, but in combination with proper paints and powder coatings, they can still be outstanding. Zinc phosphates are heavier. Manganese phosphates are generally used for "break in" on mechanical parts rather than as a base for paint.

There is a book "Phosphating of Metals" [affil. link to book on Amazon, ... on AbeBooks -->] by Rausch & Rauch that you may want to obtain. There was another book devoted to similar issues, Samuel Spring's "Preparation of Metal for Painting" [affil. link to book on Amazon]. Unfortunately, I lost my copy, but it's excellent.

Amazon offers "Practical Guide to Industrial Metal Cleaning" by David S. Peterson.
which I haven't read, but which sounds quite good from the excerpts. The Metal Finishing Guidebook has a good introduction to phosphatizing.

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