Erosion wear is the wear caused by the surface of the coating being scoured by sharp hard particles. These particles can be carried by gas or liquid and impact the surface of the coating at a certain speed. The erosion and wear resistance of the coating can be evaluated by sand blowing test. (Related instrument: impact Tester )
The test principle is shown in Figure 11_7_6. The sample is placed in the sandblasting chamber with the coating upward, fixed on the electromagnet, and protected by a rubber plate around it. Then use a jet-suction sandblasting gun to blow the sand. The sandblasting gun is fixed with a clamp to keep the sandblasting angle and distance constant. And maintain a certain blasting air pressure and sand supply rate. Abrasives generally use corundum sand. During the blasting process, the abrasive will cause erosion and wear to the coating. Sand blowing time is generally set at 1 minute.
After the test, measure the weight loss of the sample, that is, the amount of coating mass reduction. It is used to evaluate the erosion and wear resistance of coatings. Generally used test parameters are as follows:
