How To Solve The Pinhole Problem Of Powder Coatings

How to solve the pinhole problem of powder coatings? Powder coatings have the characteristics of low environmental pollution, low resource and energy consumption, and high production efficiency, and are gradually replacing solvent-based coatings. After the powder coating is sprayed and cured, we sometimes inevitably have pores and pinholes in the coating film. How to solve it?

Reasons for surface pinholes:

1. There are pores on the surface of the sprayed workpiece.

2. There is residual liquid on the surface of the sprayed workpiece, and the degreasing and rust prevention are not thorough.

3. The conductive putty of the sprayed workpiece is scraped too thick and not completely dry.

4. The spray gun is too close to the workpiece, and the construction voltage is too high, causing the coating to break through.

5. There are volatile gases in the oven.

6. The spray coating is too thick, or the coating is not fully cured.

7. Problems with the powder coating itself.

Solutions to remove pinholes on the surface of powder coatings:

1. Check the surface of the workpiece and strengthen the processing of the workpiece.

2. Check the pretreatment and improve the pretreatment process.

3. Appropriately extend the baking time.
4. Properly adjust the spraying parameters of the spray gun.

5. Check the oven, clean the drying tunnel, and purify the gas in the oven.

6. Reasonably control the coating thickness to 50-80μm and adjust the curing conditions.

7. Replace qualified powder coatings.

TIANSHI powder coating degassing agent can be used for powder coatings. It is an excellent degassing agent that can increase the output of the extrusion process section and improve the flow properties of the powder. It only takes a short drying time to show excellent wear resistance; it gives the finished product very good anti-adhesion properties; the product is not easy to agglomerate and is easy to disperse; it can show good scratch resistance when used in powder coatings; the anti-adhesion and anti-caking effects of the degassing agent can show matting properties in various coatings.