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topic 53480

Surface finish is roughened by phosphating

A discussion started in 2009 but continuing through 2019

October 29, 2009

Q. We are facing problem of disturbing the surface finish by Manganese or Zinc phosphating. We require the same surface machined finish after phosphating. What will be the process for the same? Is there any alternative process to Phosphating? We are doing it for the rust prevention of our ball valve after testing.

Anil Jadhav
manufacturing Manager in valve industry - Pune Maharashtra India

October , 2009

A. Hi, Anil. Phosphatizing is supposed to roughen the surface, to provide tooth for painting or to hold oil for improved dry running, and to serve as a break-in surface. You can't ask it to read as if it were a polished machine surface.

If you need a polished surface, you could try electroless nickel plating ... but are you sure that the phosphated surface is the actual problem rather than your spec needing correction?  :-)


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

July 6, 2019

Q. Want to do phosphating on machined components used in hydraulic cylinders.

Q1: Is it advisable to do phosphating on hydraulic oil seal groove surfaces along with all the other surfaces of the component? Will this process affect the surface finish required for oil seal groove?

Q2: After Phosphating the seal groove dimensions will change and affect the seal performance? if So then is it necessary to machine the parts with space for costing layer thickness?

Ramamoorthi chellappa
Hydraulics - Bangalore, India

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