Category Archives: Surface Prep

DECC's Quality Inspection Area

Dyne Testing for Surface Cleanliness

What is Dyne testing?

Our last blog detailed the various methods of which to prep a part substrate prior to the application of coating to ensure performance. When the prep method is mechanical, a visual inspection can verify that the prep was done adequately (a blasted surface should exhibit a “frosty” appearance).

However, we are often asked by customers how we verify a clean surface after our chemical prep process. As a quick and easy measurement for part cleanliness and surface tension, DECC utilizes Dyne test inks.

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Tumble blast machine and Pangborn

Common Surface Prep Types

A coating only performs to the level of the surface of which it is applied. In other words, if the surface of a component is not adequately prepped before the application of coating, that coating will not perform. This goes for not only the high-performance, functional coatings that DECC applies, but all coatings.

There are three main types of surface preparation that can be performed prior to applying coating.

Thermal prep

  • Placing parts into an oven at a predetermined temperature
  • Temperature is determined based on the final coating used and substrate being baked. Prebake temp must be above the final cure temperature of the coating by at least 50°F. However, the substrate must be able to withstand the prebake temperature.
  • Prebaking will remove oils and grease, but the dirt particulate embedded in the oil may still be present. That is where a mechanical removal may have to be introduced to remove contaminates completely.

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