Metal stamping parts surface adhesion test methods and requirements

Hundred test method

1. Use a cross-hatch to draw a square of 25 square millimeters on the hardware to be tested, deep marking and sample substrate;
2. After cutting, gently wipe off the cut pieces in the area with a soft brush;
3. Use 3M60 tape to firmly adhere to the area to be tested by the hardware, and wipe the tape with rubber to increase the contact area between the tape and the measured area and force the end of the tape by hand, in the vertical direction with the sample to be tested (90 Degree) quickly tear off the tape and check the surface of the tested area of the hardware;
4. Repeat the adhesive peeling 3 times in the same tested area, using new tape each time;
5. Judging criteria:
a. It is qualified when the adhesion is greater than or equal to 4B (the standard of the company);
b. 5B-The edge of the scribe line is smooth, and no paint peels off at the edge and intersection of the line of the hardware;
c. 4B- There is a small piece of paint falling off at the intersection of the crossed edges of the hardware, and the total area of shedding is less than 5%;
d. 3B- There is a small piece of paint falling off at the edge and intersection of the metal scribing line, and the total area of shedding is between 5% and 15%;
e. 2B- There is a piece of paint falling off at the edge and intersection of the metal scribing, and the falling area is between 15% and 35%;
f. 1B- There is a piece of paint falling off at the edge and intersection of the metal scribing, and the total area of shedding is between 35% and 65%;
g. 0B- There is a piece of paint falling off at the edge and intersection of the metal scribing, and the total area of shedding is greater than 65%.