Coating adhesion test---impact test method

The impact test is to use a falling ball or hammer to repeatedly impact the normal layer on the surface of the sample, so that the local surface of the sample is subjected to deformation, vibration, impact, heat and material fatigue, etc., and a force is generated on the interface between the coating and the substrate. When the force is greater than the bonding force of the coating, the coating will peel off from the substrate. This method is suitable for coated parts that are subject to shock and vibration during use.

There are two specific methods for impact testing.                      

(1) Hammer test method  

Install the sample in a special vibrator, and make the self-leveling impact hammer on the vibrator continuously hammer the surface of the sample at a frequency of 500-1000 times/min. After a certain period of time, if the sample is hammered If the coating on the impacted part is not delaminated or unfavorable, its bonding force is qualified.

(2) Falling ball test method  

Place the sample on a special impact Tester, use a steel ball with a diameter of 5-5mm to impact the surface of the sample from a certain height and a certain inclination angle, and after repeated impacts for a certain number of times, the sample is impacted Parts where the coating is not delaminated or unfavorable are qualified.