Powder coating inspection standard of a large company

1. Appearance inspection

Under natural light, detect workpieces from different angles.

1. Surface smoothness: The paint film on the entire workpiece needs to be flat, without obvious particles, stains, blisters and pits.

2. Scratches: If the paint film is not removed, very shallow scratches are acceptable.

3. Insufficient amount of powder (exposed bottom): The lack of spray on the surface seen by the customer is not acceptable.

4. Spot welding traces: If the spot welding traces have been marked on the drawings, the spot welding traces are acceptable.

5. Dust accumulation: Dust accumulation is not allowed on the surface that can be seen by customers.

6. Film color: According to the standard card, check whether it changes color. Any color variation is unacceptable.

7. Orange pattern: No obvious orange pattern should appear.

2. Film thickness

Using a magnetic Thickness Gauge with an accuracy of 2um, the measurement is not less than three positions, and the thickness is 80--120um.

3. Hardness

Use a Hardness Tester to draw a line with a 1H pencil to check whether there is a depression, and if it is not, it is qualified.

4. Adhesion

The standard refers to GB-T 9286-1998: 0-1 level is qualified

Use a 100-grid knife to draw a series of standard grid lines of 1-2mm, and stick transparent tape (18 to 24mm wide and 50mm long,
with an adhesion force greater than 2.94N/10mm). After 1-2 minutes, hold one end of the adhesive tape perpendicular to the coating, and quickly pull off the coating to see if it
meets the qualified standards of grade 0-1. (Grade 0: The cut edge is completely smooth, without a piece falling off; Grade 1: There is
a little , but the cross-cut area cannot be significantly affected by more than 5%)

5. Impact resistance

The standard refers to GB-T 1732-93

Use the impact instrument to carry out impact test for 3 times to check whether there is any crack, if there is no, it is qualified (50cm.Kg, punch steel ball diameter 20mm).

6. Gloss

60-degree specular reflectance greater than 75% is qualified.

Seven, aging resistance

The standard refers to GB-T 1766-2008: 0-1 level is qualified

Do artificial accelerated aging test for 500h, the test method refers to method 1 in GB-T 1865-2009. Comprehensive evaluation 0-1 level is
qualified