Powder on Brass/Over Rust


Facebook Share Icon LinkedIn Share Icon Twitter Share Icon Share by EMail icon Print Icon

Q. Can brass can be powder coated successfully? Also, can you powder coat over rust, or must it be removed or treated first? –M.B.

A. Yes, you can powder coat over brass. However, its surface is soft and porous, and, therefore, hard to get completely clean. The best way to clean brass is with an ultrasonic system, where mechanical agitation helps work the soils out of the pores more effectively than typical spray systems. The material may outgas and create some pinholes if it is not perfectly clean. To help avoid outgassing, the coating should be cured at a temperature in the lower end of the cure curve. 

Rust can be initially hidden by powder, but it is not a good idea. Rust under a coating will set up a low-pressure zone, and moisture can easily penetrate the coating and be absorbed by the rust. The additional moisture will cause more corrosion, the coating will swell, and it will break off the surface. Rust instead should be removed, unless you have no expectation or need for the coating to last for any appreciable length of time.

Related Topics


  • Powder Chemistries

    What is right for the customer?

  • Calculating the Cost of Powder Coating

    How can you calculate the cost of powder coating a component if you only know its surface area? Powder coating expert Rodger Talbert has the answer.

  • Understanding Infrared Curing

    Infrared cure is gaining increased attention from coaters as a result of shorter cure cycles and the possibility of smaller floor space requirements when compared to convection oven curing.