The Powder Coating Application

The powder coating application involves three basic steps:

1. Pre-treatment
2. The powder application
3. Curing

1-Pre-treatment
Parts that are to be powder coated needs to be properly pre-treated to reach excellent result. Before the parts are to be powder coated they need to be washed properly. This is just good operational practice and is not an unusual requirement. There are various ways to carry out the cleaning process. Acid cleaners may be best for inorganic (metallic) soils, whereas alkaline cleaners are often recommended for organic soils. Neutral cleaners may be used to remove soils on substrates that react with strong acids or alkalis (aluminum or zinc). Oil splitting cleaners may be desirable where high levels of oil build quickly in the process bath.

If you want to be sure that your parts are clean, there are different tests you can use. The most widely used is the "water break free" test. This test is a visual observation of whether water fully sheets over the clean part or draws away from portions of the surface (like water on a waxed car).

After cleaning, the object is recommended to be phosphated. However, for aluminum profiles chromatization is recommended.

By “phosphating” the part before applying the powder coating on the part that is to be painted you can reach a better result. The generic term "phosphating" is a process where an acid attacks the metal of the part. This process creates a surface that is tightly adherent to the base metal, has more surface area, provides improved corrosion inhibition, and helps the powder coating stick better. It provides a good coating base so the finished part has increased usable life. There are many different phosphates that can be used, but iron-phosphate is the most frequently used.

To avoid painting holes with threads, shafts and other areas that need to stay coating free we recommend that high temperature masking is to be applied to such special surfaces. It is also possible to use high temperature silicon plugs in those areas that needs to be kept coating free.

For a more comprehensive understanding and assistance we at Eko Boya recommend you to contact your pre-treatment supplier.

2 The powder application
3- Curing

 

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