I’d think maybe some sort of acid dipping? Maybe look into a chrome place, to see if they can get some heavy cleaner for you, or even some gold or zinc plating.
If you want them coated then you need to consider the fact that there is a finite clearance between the splines on the bolts and the splined holes. If you coat them with almost anything, they will not fit.
you get em coated odds are they wont thread properly or maybe not at all, if they do theyd most likely end up being stripped but the threading process anyway. dipped for sure.Id rattle can em. They make a pretty good chrome like paint now a days, degrease the shit out of em and go at it.
Newman is correct; they need to be vapor metalized.
It IS going to cost you a bunch to do this; that is for sure. Plus it typically takes a couple weeks to do them.
The thickness of the coating is angstroms in thickness; it will have NO effect on thread or spline engagement.
I don’t know of any place locally that does this. I have stuff vapor metallized for work, but our places are in the Boston area, and in OH, and neither do TI coatings.
Expect to pay a DAMN high price for this; the process and materials involved are NOT cheap.
you could do titanium nitride for a gold look, or cad plating, its cheaper, has a different shade of gold/yellow and offers corrosion resistance as well. I also like black oxide but youre going for more of a gold-ish look