53480

Surface finish is roughened by phosphating [India] 

October 29, 2009

We are facing problem of disturbing surface finish after maganese or Zinc phosphating. We required 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

Hi, Anil. Phosphatizing is supposed to roughen the surface, to provide tooth for painting or to hold oil for improved dry running. You can't ask it to read as 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 problem rather than your spec being the problem?  :-)

Regards,

Ted Mooney, P.E.  finishing.com Brick, New Jersey