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Alternative for Chrome (VI) based conversion coatings, chrome (III) basis
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For customers that require passivation properties next to excellent adhesion and corrosion protection
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Meets or exceeds Qualicoat, GSB and MIL-DTL 81706B/5541 standards
PreCoat A34 is a trivalent chromium based conversion coating for aluminium. It creates a clear thin conversion layer on the aluminium substrate that improves paint adhesion and corrosion protection. Unique about PreCoat A34 is that it also offers passivation properties.
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PreCoat A34: Conversion coating (and passivation)
Application of PreCoat A34 creates a conversion layer on the aluminium surface the improves corrosion resitance and adhesion properties. Unique feature is that it also creates a passivation layer on the aluminium surface. This passivation layer provides so called bare corrosion protection, in other words; corrosion protection of the aluminium without a coating. The characteristics of this layer are comparable with hexavalent chromium based passivation layers and in some cases it even outperforms chromium-6 corrosion protection values. The product is Qualicoat certified.
Application areas
Common application areas for PreCoat A34 are: Architectural/Construction industry.
PreCoat A34 provides superior corrosion resistance and durable adhesive bonding with all common powdercoating and wet paints.
Quality standard
Extensive laboratory and field testing demonstrates that PreCaoat A324meets or exceeds the quality standards described in Qualicoat, GSB and MIL-DTL 81706B/5541.
It is the perfect alternative to hexavalent chromium for customers that seek passivation properties in a conversion coating.
Corrosion resistance according to ASTM B117
Bare corrosion resistance per aluminium alloy.
| Alloy | Bare corrosion resistance |
| AA5005 | >1008 hr |
| AA5754 | >1008 hr |
| AA6060 | >1008 hr |
| AA6061-T6 | >3024 hr |
| AA6063 | >1008 hr |
| AA6082 | >1008 hr |
Exceeding the market standard
AD Chemicals has more than 15 years of experience in developing and supplying chromium(VI)-free pre-treatment products. It has built a track record of working for renown aluminium processing companies all around the globe.
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.
Bare corrosion protection (passivation)
Passivation treatments, that are applied in-line, form a barrier to corrosion and form a suitable layer for post painting operations. Passivation products are both economic and effective in use.
Anodizing
AD Chemicalso has expert knowledge and offers a wide variety of chemicals and additives for the anodizing process.
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