Microscratch Resistent Coating
Q. I have recently coated some objects with a high gloss black powder. I have noticed that when I rub my thumb (which is pretty rough) across the surface, that I can see some micro scratches. I have experimented with the recommended 1.5-3 mil, baking time and temperature. I then Scotch-Brighted the parts, recoated them, resulting in a total 6-8 mil, increased the temperature 25°F over recommended temp and increased the time eight mins. I am still able to make the micro scratches. Applying Mother’s wax over the parts made the scratches less obvious. Is there any way to make a powder coated part micro scratch resistant? J.C.
A. The phenomena you are describing is called “marring.” Mar resistance is formulative property inherent in the powder coating. This means if you apply and cure the powder coating properly, then you will get the expected mar resistance. However, if your coating does not have the mar resistance you desire, then you must obtain a powder coating that is harder and more mar resistant. Be aware however, that high gloss black powder coatings are very susceptible to fine scratches. Remember, that this is an organic coating and not plating, which is much harder and more scratch resistant. If a harder powder coating does not give you the performance you need, then look elsewhere for a solution.
Question: What methods are available for removing cured powder coatings, and what are the pros and cons of these methods?
Powder coating is one of the most durable finishes that can be applied to industrial manufactured products, and offers excellent corrosion protection and is very safe because of its lack of volatile organic compounds.
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.