I've been working on the front suspension which is mostly aluminum and steel fasteners with corrosion resistant coatings. However, there are two sets of parts which are made of uncoated steel which will eventually rust.
The pins the mount the shock absorbers to the lower control arms had rough cut ends and a bevel created with a grinder (see first two pictures). I sanded them with 60, 120 and 220 grit paper and then polished them to a mirror finish (see second two pictures). Since there is a close tolerance fit to slide the pin through the mono ball in the shock absorber, I didn't want to powder coat or plate the part. Instead I cleaned them with acetone and then rubbed them down with Boeshield T-9. We'll see how it holds up.
I also had the lower ball joint plates powder coated Sunstorm Silver from Prismatic Powders. All of the holes as well as the two tongue and groove joints were masked.