PreCoat CR Free, chromefree pretreatment for aluminium

AD Chemicals metal surface treatment logo
  • Worldwide best chromefree pretreatment for aluminium
  • Superb adhesion, corrosion protection and cost effective processing
  • GSB and Qualicoat approved
  • Indepedently tested by IFO for 3000 hours AASS

AD Chemicals PreCoat CR free is a completely chromium free conversion coating that is used in the pretreatment of aluminium alloys prior to the coating process. PreCoat is known as the best hexavalent chromium alternative worldwide.

Anodising chemicals project


Contact us for more information

+31 (0) 167 526 900

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.

precoat chromefree performance

Results AASS 3000 hours

Results after 3000 hours AASS according DIN EN ISO 9227 performed by IFO (Germany).

precoat cr free salt spray test

AD, the chromefree specialist

Also companies that are seeking improvement in an already chromefree process can count on AD. AD has an extensive track record in optimizing the performance and efficiency of chemical pretreatment lines.


AD Chemicals supplies a range of products for the pre-treatment prior to powder coating, anodizing and passivation of aluminum substrates.

Galvanized alloys

AD Chemicals supplies a range of products for the pre-treatment of hot dip galvanized steel and for hot zinc processes.

Iron and Steel

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