PreCoat Color, chromefree pretreatment for aluminium

AD Chemicals metal surface treatment logo
    • Chromefree pretreatment of aluminium
    • Superb adhesion, corrosion protection and cost effective processing
    • Qualicoat approval, Tested by IFO for 3000 hours AASS
    • Gives yellow color to the substrate for easy visual quality check

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 Color chromefree

PreCoat Color is used to obtain a coloured conversion coating on aluminium extrusions and panels. After immersion (or spraying) in PreCoat Color, the wet film is dried on the aluminium surface without additional rinsing (so called no rinse system), prior to the powder coating.

  • PreCoat Color is suitable in spraying and immersion processes
  • PreCoat  provides good protection to under creep corrosion
  • PreCoat provides excellent adhesion with organic coatings (e.g. powder paint systems)
  • Qualicoat approval

Unique Yellow color for quality control

PreCoat color gives a yellow color on the aluminium substrate which enables easy visual quality control.

precoat color chromefree pretreatment aluminum

More than 15 years of experience

AD Chemicals is already more than 15 years a leader in the field of chromefree pretreatments for aluminium substrates. With PreCoat Color 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 color chromefree

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

AD Chemicals has built a reputation for innovation and product improvement and has developed a range of alternative products for the phosphating process based on polymers and silane based binders.


AD Chemicals produce and supply a range of products that surround the electro-chemical polishing process of many substrates such as titanium, stainless steel and aluminum.