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Bare corrosion protection (protection without a coating)
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Alternative for Chrome (VI) based conversion coatings
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For high-end applications in automotive, aerospace and electronics
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Meets or exceeds Qualicoat, GSB and MIL-DTL 81706B/5541 standards
PreCoat A32 is a chromium(III)-based passivation for aluminum. It creates a clear, thin conversion layer on the aluminum substrate. Switching to this chromium(VI)-free system is possible without major line modifications.
Contact
Need process advice? Ask Roland van Meer (Sales Director)
+31 (0) 167 526 900
PreCoat A32 – Advanced Passivation System for Aluminium
PreCoat A32 forms a high-performance passivation layer on aluminium surfaces, delivering effective bare corrosion protection—corrosion resistance without the need for an additional coating. The protective characteristics of this layer are comparable to, and in some cases exceed, those of hexavalent chromium-based systems.
The product has been independently tested by a research institute affiliated with the European Space Agency (ESA). Results identify PreCoat A32 as one of the most promising chromium-free anti-corrosion pretreatments currently available on the global market.
Application Areas
PreCoat A32 is widely used in sectors such as Automotive, Aerospace, Electronics, and Architectural/Construction.
It provides outstanding corrosion resistance and ensures durable adhesive bonding with chromium-free organic coatings (e.g., powder coatings) and structural adhesives. In electronic applications, its high surface conductivity is particularly advantageous.
Quality Standards
Extensive laboratory and field testing confirms that PreCoat A32 meets or exceeds internationally recognized standards such as Qualicoat, GSB, and MIL-DTL 81706B/5541. This makes it a highly reliable and sustainable alternative to hexavalent chromium-based pretreatment and passivation systems.
Corrosion resistance according to ASTM B117
Bare corrosion resistance per aluminium alloy.
| Alloy | Bare corrosion resistance |
| AA2024 Coil | 168 |
| AA2024-T3 | 500 |
| AA5005 | >1008 hr |
| AA5754 | >1008 hr |
| AA6060 | >1008 hr |
| AA6061-T6 | >3024 hr |
| AA6063 | >1008 hr |
| AA6082 | >1008 hr |
Exceeding the market standard
Many surface treatment operations desire certification by industry organizations, especially when applied to new and technically driven products. Customers have come to rely on AD Chemicals to assist in or lead the certification process. All AD Chemicals products meet or exceed current market standards such as GSB, Qualicoat, Qualisteelcoat, Qualanod and MIL. Today AD Chemicals can rely on more than 40 years of experience in metal surface treatment, from which are more than 15 years with chromium(VI)- free technologies that exceed or meet the market standard!
Discover more
Aluminium finishing
AD Chemicals supplies a range of products for the pre-treatment prior to powder coating, liquid painting, passivation and anodizing of aluminium.
Pre-treatment
Durability and extended end-use life are demands that consumers take for granted and of which they expect continuous improvement year on year. Paint adhesion and corrosion resistance are critical factors in keeping end-use applications in a condition that is expected to remain in place for their usable life time.
Anodizing
AD Chemicals has expert knowledge and offers a wide variety of chemicals and additives for the anodizing process.
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Other AD Metal Surface Treatment solutions
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