electrocoating- Is that anodizing?
It isn't easy to get a lasting coating any other way. The bigger sailboat masts are painted and need to be repainted after a decade or so.
Certainly the Ford Rangers built around the turn of the century and sold here have aluminum hoods which have pealing paint and corrosion on the leading edge. Corrosion appeared within a couple years on some.
There is an interesting documentary by National Geographic on youtube showing the painting of the aluminum Tesla cars. They also show the rolls of the raw material, the stamping machine, welding robots etc. Also i think the Delorian (back to the future car) was alloy.

If some one figures out how to electrically isolate a rivet from an anodized alloy extrusion that would be good.