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Phosphate coating process and possible problems

Q. I would like a process flow diagram of the Phosphating process (Immersion) and more information on the Phosphate coating in Automotive manufacture.

Thulani Dlamini
auto mfgr. - DURBAN, KZN, South Africa
2004

A. I would suggest that you first define what your application is, and what you want from the phosphatizing. A good place to start is the ASM International Metals Handbook, Volume 5. It has a very good section on phosphatizing.

Jim Treglio - scwineryreview.com
PVD Consultant & Wine Lover
San Diego, California
2004

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Hi Thulani. As implied by Jim's answer, "Phosphate coating in Automotive manufacture" is too vague. You'll probably need to name either the particular component or the type of phosphating process because manganese phosphating is used for oil-bathed engine components, whereas painted components may be either iron phosphatized (often a 3-step process, sometimes 5 steps), or zinc phosphatized (often a 7-step process). Good luck.

Regards,

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