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International standard of phosphating process

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Tip: People don't like to give and not receive. Readers often reply to actual situations (from which they can learn), but less commonly to abstract questions.

Q. What are the standards/Specifications for Cold Phosphating?

Chandra Sekhar
Manager - Hyderabad, India
February 1, 2023

⇩ Related postings, oldest first ⇩

Q. I am interested to get the information of what is the international table or procedure of phosphating. the entire phosphating process for ISO 9000 and as per international standards

manoj ks anghvi
- aurangabab/Maharashtra state/india

A. Hi Manoj,
There are several different types of phosphatizing, Manoj. The simplest and most basic is iron phosphate. A little more expensive and complicated is zinc phosphating. Both of these are used as pretreatments for painting. Then there is manganese phosphating, which is heavier, and is used on machine parts to discourage seizing if the lubrication runs dry momentarily. On top of this, there are "tweaks" like calcium-modified phosphates for better performance.

ISO 9000 is a quality control system rather than a phosphating specification.

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

A. You have Federal Standard TT-C-490 [from DLA] type I for Zinc Phosphating.

yehuda blau
Yehuda Blau
YB Plating Engineering and Quality - Haifa Israel

Q. Sir,

I would like to ask about the chemistry of phosphating process. I mean what chemical reactions and complexes are formed when salts of transition metals are mixed with phosphoric acid?

Waqar Ahmed Khan Lodhi
- Karachi, Pakistan

Q. Dear sir:
please inform me about reference of Zn-Mn phosphating
best regards

Moha. Mahiz
student - Iran

A. Waqar, Moha: Here are two good references --

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

Q. Dear sir,
I'm from a production company where I must set up phosphate line but I don't know how to do it. I mean I don't know about required material for each step of phosphating. Can you give me information about required material?

Thank you for your answer

Elyas Kh
- Iran
March 15, 2012

Hi, cousin Elyas.

That is a very broad subject. There is cold phosphating vs. hot phosphating. There is iron phosphating and zinc phosphating and manganese phosphating, and various advanced mixtures like calcium enhanced phosphating. There is 3-stage and 5-stage and 7-stage phosphating. There is phosphating as a pre-paint treatment, and phosphating as an oil-retaining "break-in" coating for engine parts. I think you'll need to try to find a copy of one of the books about phosphatizing to understand the almost countless options, or to try to tell us your exact situation and your needs. Then if you have specific questions, I think our readers will be happy to try to help you. Good luck.


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

Q. Dear sir,

I would like to ask for the standard thickness of zinc phosphating of the surface material.
How many microns will be accepted for thickness of phosphate?
Can you show me the standard (maybe in ISO or ASTM)?


Mario Adha
- Tangerang, Indonesia
October 10, 2013

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