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topic 3598

"P-ratio" and "Nickel Adhesion Volume" for zinc phosphate


My customer has requested verification of "nickel adhesion volume" and "P-ratio" (a relationship between the iron phosphate to iron phosphate+zinc phosphate). It appears to be a Japanese requirement, but I have not found a procedure for either of these tests. Anyone have an idea on what these tests are and where I might get a standard specification on them?

Bob Doering
-LaGrange, Ohio

April 10, 2008

Hi, Bob. I haven't heard the phrase "nickel adhesion volume". Could it be just an accidental morph from the simple phrase "nickel adhesion value"? There are ASTM adhesion tests.

As for "P-ratio", readers have given a good introduction in letter 34262. Good luck.


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

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