"If I had an unlimited budget and was aiming for >1000 years I would pour the piles to bedrock with stainless rebar inside fly-ash concrete and top those piling

"If I had an unlimited budget and was aiming for >1000 years I would pour the piles to bedrock with stainless rebar inside fly-ash concrete and top those pilings..." What would situation be if you used proper hot-dipped galvanizing instead? (And I mean proper quality hot-dipped galvanizing, not the usual 'toy' stuff that passes for galvanizing these days.) I've a good reason for asking, as I've an example of galvanizing that is in such good rust-free condition after being exposed to the weather and elements for 65 years that I would not have believed the fact unless I'd actually known its background and seen its condition, which I've done on multiple occasions for reasons I've explained below. The galvanizing in question involves an extant clothesline that's still rust-free and in good condition, it consists of three galvanized, multistrand (7 strands if I recall correctly) of clothesline wire that span the full length of the backyard and that terminate on wooden poles with horizontal 'T' beams spanning them (it's a typical clothesline that everyone's familiar with). The clothesline was installed in the backyard of my patents home in the mid 1950s and in 1957 an electrical conduit tee junction of 3/4" diameter (for joining conduits) that was made from folded steel was wrapped freely around the middle clothesline and a dog chain attached. This meant that the dog could pull the tee junction along the line so that he could gain almost full access to the total area of the backyard. Despite the wear and tear on the clothesline from the steel in the tee constantly sliding over the line—to wear that's even extended to the galvanizing being worn off from the high points of the strands of wire by the steel tree to the extent that it's exposed the underlying bear steel yet nevertheless this clothesline still shows no signs of rust after 65 years. I've studied chemistry for some years so I understand how galvanizing works but I still find it incredible that this galvanized wire is still rust-free after 65 years. Frankly, I find it so astonishing that every time I visit my parents' old home I cannot but help to cheek up on the status of said clothesline. Incidentally, little remains of the electrical tee junction, it was made of mild steel and painted black, the paint offering little protection and there would have been no paint that the point of interface between the steel and the wire.