"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
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, P.E.
Pine Beach, New Jersey
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