A 3-in-1 pretreatment process chemical is a single chemical formulation designed to perform three important metal surface preparation functions in one tank:
1. Degreasing – removes oil, grease, and dirt.
2. Derusting – removes light rust and surface oxides.
3. Phosphating – forms a phosphate conversion coating that improves paint or powder coating adhesion.
- This process is widely used in small and medium powder coating plants because it reduces the number of tanks, chemicals, and rinse stages required.
* How the Process Works
- When a mild steel part is immersed in the solution:
Cleaning agents remove oil and grease.
Acidic components dissolve light rust and oxidation.
Phosphate compounds react with the steel surface to form a thin phosphate layer.
* The treated surface becomes suitable for:
Powder coating
Liquid painting
Primer application
