Attaining Edge Coverage
The problem is that the edges of the bus bars that we are powder coating do not have proper coverage, which is not acceptable to our customer. Is there any solutions we could try? I have wondered if it could be a characteristic of the powder itself.
Share
Q.We powder coat bus bars that are copper and then tin plated. We sandblast the parts before they are powder coated. We apply 3-5 mils of powder, the parts are then cured at 375°F for 20 min. The problem is that the edges do not have proper coverage, which is not acceptable to our customer. Is there any solutions we could try? I have wondered if it could be a characteristic of the powder itself. S. A.
A. You are absolutely correct, it is a function of the powder coating formulation. The powder coating formulative property that you seek is called “Edge Coverage” or sometimes called “Pull Back.” You must discuss this with your powder coating supplier. They will adjust the flow characteristics of the powder coating material to reduce this problem. Be prepared for more orange peel on the surface after the coating has been changed.
RELATED CONTENT
-
Proper Testing of a Powder Coat Finish
Manufacturer shows how it performs extensive tests on powder coated medical carts.
-
Preparation of Stainless Steel for Powder Coating
Should type 316 stainless steel castings be sandblasted before powder coating, or can they be chemically etched? Should the parts be pre-heated in an oven before coating?
-
Curing Oven Basics
Simply heating up the substrate does not cure the coating. There are many variables to consider when choosing the best cure oven for your application...
