Home /
Search 🔍
the Site
pub Where the world gathers for
plating, anodizing, & finishing Q&As since 1989


Comparing Phosphating Treatments


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

"Practical Guide to Industrial Metal Cleaning"
from Abe Books

Affil. Link
Your purchases make finishing.com possible


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 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 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

adv.: ResinTech banner

(No "dead threads" here! If this page isn't currently on the Hotline your Q, A, or Comment will restore it)

Q, A, or Comment on THIS thread -or- Start a NEW Thread

Disclaimer: It's not possible to fully diagnose a finishing problem or the hazards of an operation via these pages. All information presented is for general reference and does not represent a professional opinion nor the policy of an author's employer. The internet is largely anonymous & unvetted; some names may be fictitious and some recommendations might be harmful.

If you are seeking a product or service related to metal finishing, please check these Directories:

Chemicals &
Consult'g, Train'g
& Software

About/Contact    -    Privacy Policy    -    ©1995-2023 finishing.com, Pine Beach, New Jersey, USA