Need to know the answer urgently. If anyone knows, please answer, thank you.........Supplement: aluminum without primer spraying, spray and spray paint, paint is 22 dilute acid. After spraying up, adhesion is good, not easy to fall, what formula, or in paint which need to add what?
Make sure you're not primed. Try acrylic paint on the outside. If it is not the outdoor outdoor environment, and not often crash, it is only indoor use, you can directly use epoxy resin topcoat, the problem is not.Outdoor environment should be cautious. Ordinary epoxy finish is not suitable for outdoor use.
Only the use of acrylic polyurethane finish, acrylic polyurethane has good weatherability and chemical resistance, but because the paint itself has tiny pores in spraying primer and paint case, after long-term exposure to the sun and rain and other environment, moisture will penetrate the film, and the aluminum contact formation of aluminide, resulting in paint peeling off.The above suggestions for your reference, thank you!
The main consideration of painting on aluminum is the adhesion between primer and aluminum. In general, the market is more use of phosphating primer, phosphating primer is a sacrificial paint (will cause damage to the base material), and the high requirements of adhesion performance is not ideal.Also, the base coat is made of ordinary epoxy resin, and the adhesive force is rather weak.At present, relatively strong adhesion paint, 100 meter test can reach 100%, in China only a few foreign paint production enterprises.
