Cr6+ free passivation of aluminum

“As an alternative to the Cr6+ containing Alodine 1200 Mifa Surface Treatment offers the Cr6+ free passivation Surtec® 650.
Through the chromating process a chromate layer (conversion layer) is formed onto a metal surface. Mifa Surface Treatment offers both, Cr6 + free passivation, Surtec® 650 as well as Cr6 + content layers, Alodine.

The chromating process converts the aluminium base layer into another aluminum connection. This thin conversion layer protects the substrate against corrosion and is an excellent basis for the application of various types of lacquering and paintings. After lacquering the chromate layer gives a perfect and long lasting protection against undercorrosion.

Mifa Surface Treatment offers yellow chromating (Alodine 1200) as well as the Cr6+ free passiviation of Aluminum, Surtec® 650.”


Max. layer thickness
less than 1µm without any influence on the tolerances

Corrosion protection
“max. 336 hours salt spray test according to
DIN EN ISO 9227 ASTM B-117”
Electrical conductivity
less than 32,25 mΩ x cm2
slightly iridescent
IMDS nummer
Max. size
1.900 x 500 x 850 mm (max. 500 Kg)
General specifications
“MIL-DTL-81706-B and

If you want to know more about this coating. Do not hesitate to contact us. We are pleased to help you.