How to test for good passivation/phosphating?
How to test for good passivation/phosphating?
(OP)
HI,
I wondering whether there is any test for testing the passivation on the surface of the metal. Normally Salt Spray Test has been carried out for testing coating on the surface of the metal, however when I asked my supplier who carry out passivation for our product, they replied that salt spray test is not the correct test to perform for passivated surface. So may I request you whether can you recommend any test for passivated metal surafce
BR
N D Senthil Ram
I wondering whether there is any test for testing the passivation on the surface of the metal. Normally Salt Spray Test has been carried out for testing coating on the surface of the metal, however when I asked my supplier who carry out passivation for our product, they replied that salt spray test is not the correct test to perform for passivated surface. So may I request you whether can you recommend any test for passivated metal surafce
BR
N D Senthil Ram





RE: How to test for good passivation/phosphating?
Phosphate coatings are often tested using neutral salt spray tests, with the number of hours depending on thickness/coating weight, use of oil or topcoat, etc. Usually in the range of 2 to 96 hours.
RE: How to test for good passivation/phosphating?
RE: How to test for good passivation/phosphating?
I thank you for your reply
Dear TVP
My product would be NdFeB magnet. It is a pretreatment and just phosphating on the magnet surface.its mainly for good adhesion and its our requirement. Please let me know whether if there is any standard for testing passivation. For our passivation supplier does not recommend salt spray test and if tested in salt spray, the corrosion are with in minutes
RE: How to test for good passivation/phosphating?
TTFN

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RE: How to test for good passivation/phosphating?
I finally has to comply with A967 standard for passivation testing on metal surface
RE: How to test for good passivation/phosphating?
Of course, A967 is for passivation of STAINLESS STEEL parts, not NdFeB parts. YMMV.
RE: How to test for good passivation/phosphating?
Hope you do agree with me
Regs
N D Senthil Ram