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Wednesday, July 9, 2014

Powder Coating Application: Pretreatment

Pretreating a substrate for powder coating is an important step in the application process. Powder coating a substrate with contaminants on the surface will result in poor performance of the coating. Here is an overview of the pretreatment step for powder coatings:

1. Clean the substrate to remove all contaminants, including soils, oils, oxides, and smut. Titration readings measure the total alkalinity or acidity levels. Even if the titration readings are fine, watch out for sludge or soil buildup in tanks that because it will reduce the cleaning activity.

2. Rinse the substrate to remove any remaining contaminated solutions from the surface. It also adjusts the pH for the next step.

Conversion coatings are a film which changes the physical and chemical nature of the metal surface. A clean surface is required for the reaction. You might need conversion coatings for your application.

Common types of conversion coatings:
  • Iron phosphate for ferrous metals
  • Zinc phosphate for ferrous metals
  • Chromate conversion for aluminum
  • Manganese phosphate

For more information about pretreating for powder coatings, read TCI's Troubleshooting Guide.

Intech Services and TCI Powder Coatings have partnered to create TruPak, a program that offers over 300 of TCI's most popular powder coatings in 1, 3, 5, and 10 pound boxes. Click here to buy TruPak powder coatings.

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