Q. Are you aware of any uncomplicated, user-friendly pretreatments that are compatible with powder coating, will inhibit rust on surfaces with deep inset corrosion and will accelerate beneath the coating after the process is complete? J.R.
A. Iron phosphate works well with powder but has modest corrosion resistance if the coating is broken. Zirconium oxide products can be modestly better, and some contain other metals such as copper or titanium and are somewhat more resistant to oxidation. Zinc phosphate has very good corrosion resistance, but it also requires waste treatment and would not be considered simple or user-friendly. One of the best options is a primer. Thoroughly clean the surface by chemical or mechanical cleaning, then you can have the parts electrocoated or you can apply a powder primer. The primer provides exceptional resistance to moisture penetration and a thicker film with better edge coverage. The primer does a great job of stopping the undercoat creep you refer to.
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...
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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.