galv will last as long as the zinc takes to get used up.
And thats is a function of how exposed the steel underneath is.
And the water/air exposure
Notre Dame and other high buildings
Apr 20, 2019
Last reply: 7 years ago
45 Replies
DerbyBorn snipped-for-privacy@Nearhome.com wrote in news:XnsAA37AFCF4CAB7TrainJPlantntlworldc@81.171.92.222:
I suppose something like the instalation on an Aircraft Carrier Deck
That steel that protects itself with a thin layer of rust seems popular for bridges now.
Quite a lot of box girders on bridges have no protective coating on the insides even though they would be prone to condensation. They now fit dehumidifiers and keep the humidity below 60% (IIRC) as steel doesn't rust then. Its cheaper and lighter than paint, etc.
Presumably the cost of energy and maintenance of the dehumidifiers makes it so ?
I understand that it's exposure to sulphurous fumes that does for hot dip galvanising. Not in a cathedral, surely. :-)
formatting link
gives a set of pics of the hot dip process, I'm fairly sure at the place that did my metalwork. I wonder what happened to the car.
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