Proper Metal Temperature for Application
What are both the ideal and the maximum surface temperature metal should be when applying powder?
Q. We are powder coating parts made from a mild steel substrate. What are both the ideal and the maximum surface temperature the metal should be when applying powder?— L.M.
A. I would say the preferred temperature is ambient and the normal recommended maximum is around 120°F. Parts that require very heavy film build can be coated at higher temperatures, but remember that higher temperatures will increase smoke and also generate a warm air updraft in the powder booth. Powder will melt at temperatures between 180° and 240°F. If the powder melts, you will not have as much flow during the cure cycle, so the material will have a lot of orange peel and heavy film build. It may also smoke a lot during application. Parts can be coated with fusion bond epoxy (FBE) at very hot temperatures (400°F or higher), but not with any decorative powder.
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...
Masking is employed in most any metal finishing operation where only a specifically defined area of the surface of a part must be exposed to a process. Conversely, masking may be employed on a surface where treatment is either not required or must be avoided. This article covers the many aspects of masking for metal finishing, including applications, methods and the various types of masking employed.
For more than 50 years, fluidized beds have been used to coat parts with powder coatings. In this article, two industry experts tackle some common questions about the fluidized bed process…