ASTM B571 Test Fixture - Qualitative Adhesion Testing of Metallic Coatings
The standard outlines a qualitative test to assess the adhesion of metallic coatings on various materials.
The test involves bending a coated sample over a cylinder (mandrel) with a diameter four times the sample's thickness, until its legs become parallel. We then examine the bent area under low magnification (around 4x) for signs of poor adhesion, such as peeling or flaking of the coating from the underlying material (substrate). If cracks or blisters appear, a sharp blade can be used to try to lift the coating. Cracks are generally expected in hard or brittle coatings but don't necessarily indicate poor adhesion unless the coating can be peeled off with the blade.
Then, the bent sample is repeatedly flexed back and forth 180 degrees until the base metal fails. The bent area is again examined under low magnification (around 10x) for any separation or peeling of the coating. Similar to the first part, if the coating can be lifted with a sharp blade, it signifies weak adhesion.
Mandrel selection should be made according to the thickness of test panel and coating.
Technical Specifications:
Test Panel Dimension: 1” … 2” x 4”… 8” (WxH)
Jaws surface: 40x60 mm [Pyramid (serrated)]
Body: Steel with coated
Delivered with jaw alignment part
Net Weight: 12kg
Box Dimensions: 20x30x20(h) cm
Total Weight: max. 15kg
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