After poking around my Humvee for a couple days, it occurred to me I was going to need a LOT of bolts. Or WANTED to replace a lot of them. And washers. And use nylon locknuts on many of them. Amazon has amazing prices on 100-count lots of zinc chromate finished parts and, compared to the big box stores (or even the local ACE hardware which has a good selection of odds-ends, washers, grommets, #8 bolts, more).
I too had some corrosion around the hold-downs, and had a riv-nut tool on hand for other projects, pop-rivet tool I'd had around for 30-some years, so I considered how I'd want to reinforce (if not replace) the battery tray. The trays CAN be replaced, but I like my fix better.
BTW, I tend to use deoxit or other corrosion-resistant lube (the stuff you use for home wiring, like aluminum to copper/steel, I forget the name, stuff's black, conductive, has zinc in it) all over the place. YMMV.
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After doing the quick/dirty patches, I went ahead and took a steel brush to the surface then hit it with black zinc oxide primer and more of the rubberized 3M undercoating stuff.
Battery tray inside:
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Have fun.