Regarding the determination of the wear resistance of the powder coating film, the rolling wear Tester is mainly used to measure the mass lost by the coating film after a specified number of grinding cycles under a certain load, expressed in mg.
(l) Instruments and equipment
GM-II Rolling Wear Tester. (Abrasion Tester)
Analytical balance: a sense of 0.00lg.
(2) Sample
See Table 6-2.
The diameter of the steel plate is 90mm, there is a small hole of S8mm in the center, and the thickness of the steel plate is 2mm.
(3) Test method
Fix the sample on the turntable of the wear Tester, add , gently put down the pressure tube, put down the suction nozzle, and adjust it to 1~1.5mm away from the sample , Turn on the main switch, vacuum switch, and turntable switch in turn, grind the sample for 5° to form a relatively flat surface, turn off the power, take out the sample, gently wipe off the floating debris with a brush, and weigh it.
The technical product standard stipulates that the number of grinding revolutions and the weight should be subtracted. When the specified number of grinding revolutions is reached , stop immediately, take out the sample, wipe off the scum, and weigh it.
The test is carried out under the conditions of (23±2)°C and relative humidity of 50%±1%.
Parallel test 2 times, the error between each measured value and the arithmetic mean value shall not be greater than 7%, and the results shall be taken as the mean value.
