Adhesion testing
05-04-2015, 09:27 AM,
#1
Adhesion testing
Hello all,
we are using flame spraying of Molybdenum wire to steel core. Coated layer thickness is 0,07mm. And for that I would like to know how to evaluate (rate) the adhesion of the layer. Now we use bending test and "scuff" test. But I need some value (of adhesion) to compare different products / surface preparation / etc.
Standard scratch test show no result.
Have you any idea or experience?
Thank you
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05-04-2015, 01:07 PM,
#2
RE: Adhesion testing
(05-04-2015, 09:27 AM)MartinFe Wrote: Hello all,
we are using flame spraying of Molybdenum wire to steel core. Coated layer thickness is 0,07mm. And for that I would like to know how to evaluate (rate) the adhesion of the layer. Now we use bending test and "scuff" test. But I need some value (of adhesion) to compare different products / surface preparation / etc.
Standard scratch test show no result.
Have you any idea or experience?
Thank you

Hi MartinFe,
There is a relatively simple method, the adhesive strength of similar layers to similar substrates to compare. In these tests, cross sections (layer + substrate ) be tested means Brinnel hardness test. Here Brinell ball is pressed on the interface between layer and substrate with a specific force. The higher the Brinell impression without cracks, the better the adhesion. This test is no value for the adhesive strength in MPa, but let the spray coatings well compare.

   
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05-04-2015, 01:49 PM,
#3
RE: Adhesion testing
ASTM 633-01 is the standard used for measuring adhesion (bond strength) of a coating. It specifies the size of the coupon and the test method. A simple internet search will turn up many copies of the procedure.
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