Several years ago I had done some research to determine the best way to protect the magnesium parts of the little blue car and came up with the following. It may or may not be current but perhaps it will be useful to you.
Please see the following URL: A Brite Company - Metal Finishing Supplies & Service
SurTec 650 chromitAL TCP
A chemical process that produces a highly corrosion resistant trivalent chromate conversion coating on aluminum and aluminum alloys. It can be applied by brush, spray or immersion. The color of the coating can be varied from faint blue to tan and iridescent. It also makes an excellent base for organic coatings (paint & powder coat).
chromitAL TCP is a drop in replacement for conventional hex-chrome coatings and matches or exceeds the properties of hex-chrome solutions.
SurTec 650 chromitAL TCP is approved under Spec. MIL-DTL-81706, the Qualified Products List for Spec. MIL-C-5541 Type II, Class A&B, Form II, Method A & C. (336 hrs min. to NSS per ASTM B-117).
The hexavalent chromate is the deadly stuff that this Trivalent product replaces. Another company also has license from the Navy to produce a similar product, minimum order is as follows:
5 lbs. Luster-On Aluminescent - $ 100.00 / lb.
Shipment – Springfield, MA
and the description is at: Luster-On Products, Inc. http://www.luster-on.com/Luster-On_A...cent_flyer.pdf