Passivation is a form of protection that prevents metal surface from being attacked by substances found in the atmosphere while keeping untouched the surface electrical conductivity.
As it keeps untouched the aluminum conductivity, passivation is widely used in the electronic and military industry, but it is also an excellent substrate for painting, providing chemical protection and a perfect adherence of the paint.
As with regard to resistance to saline fog, we can reach protection levels able to pass the Saline Acetic 100-hrs TEST for YELLOW CHROME-PLATING (ALODINE 1200).

Complying with standard MIL-DTL-5541 TYPE 1