Coating Quality Inspection
▲Measures of Different Coatings ▲Salty Spray Test ▲(High) Pressure Cookery Test
1.Ni coated magnet must survive high pressure cooker with National examining standard (0.2- 0.24Mpa, 120℃) passes quality test.
▲Coating Bonding Effectiveness Determination Thermal Shock Resistibility
Place Ni-Cu-Ni coated magnets inside of oven and increase the temperature up to 250°C, after one hour drop the magnet into iced water. Coating that passes examination shall not have any part of coating fall apart air bubble inside or under the coating.
Glue the magnet with steel object that has greater size compare to itself and drop it from 1.5 meter height at free fall speed for 8 times. There should not been any part of coating strip off from the magnet.
▲Zinc Coating Bonding Effectiveness
Zinc coating binding effectiveness cut the coating on the magnet with sharp steel edge with 30°of incision.The area of cut magnet coating should be square with 1mm2. A success test subject should not fall apart from the base.