By design this guide does not purport to address test methods or procedures developed specifically for the functional powder coating market those coating powders for. 3 powder it when fully prepped and dry your metal project will be ready for powder coating.
The crosshatch test is designed to test the adhesion of the powder coating to the metal substrate.
Powder coating testing process. Testing methods for powder coating. The testing of powder coatings differs from their liquid counterparts in the characterization of the powder itself. Yang terdiri dari partikel partikel yang dihaluskan seperti resin pigmen dan bahan baku lainnya yang diberikan muatan elektrostatis kemudian disemprotkan ke objek yang akan dilapisi atau di cat.
The most common areas to test for basic powder coating functionality are. Ease of dry powder flow and. Coating shall not vary or 5 from data sheet requirements on each material supplied.
A special pressure sensitive tape is then applied to the crosshatched area and then removed quickly at close to a 180 degree angle. An easy and popular test for adhesion this test is performed by making a series of cuts through the powder coating in a crosshatch formation five times up and five times down. This includes tests such as.
How to make powder coatings. Powder coating adalah proses finishing kering. If large amounts of paint come off with the tape the coating fails the test.
If that pencil cuts down to the metal then it failed that test. As the parts to be coated are grounded the powder is attracted towards the part via the electrostatic process. Once the powder is applied the parts are cured in an oven which melts and cross links the powder over the surface of the part and creates a tough scratch resistant and beautiful finish.
Let s explore how to make powder coatings the different test methods used during manufacturing to evaluate powder coatings. 2 bending test astm d522. It is applicable to both thermoplastic and thermoset coatings unless indicated otherwise.
Testing methods are designed for two purposes. To complete the test you simply sharpen your pencil then create a flat end with a piece of sandpaper and place it at a 45 degree angle to the coated surface. Adhesive tape is then applied to the area and removed.
4 1 this guide provides a useful summary to the selection and use of procedures for testing coating powders and powder coatings. Quality control 1 gloss test astm d523 test coated flat panel with gardener 60 degree meter. Press it down into the coating and then push.
No matter what you are coating there are a few tests you need to add to your daily process. The coating itself is done through an electrolysis process whereby the metal object is positively charged in order for the powder to be attracted to it and bond well during the next stage. It s performed by cutting a crosshatched grid pattern into the coating all the way down to the substrate.