Use of PreCoat CR Free
PreCoat CR Free is used to obtain a clear, no-rinse conversion coating on aluminium extrusions and panels. After pre-treatment with PreCoat, the wet film is dried on the aluminium surface without additional rinsing prior to the powder coating.
- It is suitable in spraying, immersion and cascade processes.
- Qualicoat and GSB approval.
- Provides good protection to filiform corrosion
- Gives excellent adhesion with organic coatings.
More than 15 years of experience
AD Chemicals had been a leader in the field of hexavalent chromium alternatives for more than 15 years. With PreCoat CR Free you can trust on a robust system with a similar performance as chromium.
Independently tested by IFO Germany
“Is the requirement of 1000 hours corrosion resistance which Qualicoat prescribes enough?”
AD Chemicals doubts this statement of Qualicoat. When you only focus on the 1000 hours corrosion resistance, that has been described in the past, Qualicoat is right. However, the corrosion resistance of chromium (VI) based pretreatments fulfills the 2500 hours. This was a fair value for Chromium (VI) based pretreatments on Aluminium. AD Chemicals has investigated their chromium-free systems on the corrosion resistance of 3000 hours and compared it with the traditional chromium(VI) systems.
Internal research shows that the chrome free pretreatment of AD Chemicals PreCoat Cr Free (Qualicoat A-021), that has been approved since 2003, achieved a corrosion resistance of 2500-3000 hours. So AD Chemicals goes for long corrosion resistance.