I doubt any one has the technology to accuratly predict the time for iron to start and decay.
There is many layers in Iron one of the many reasons for using iron in so many buildings process.

By 1912 the iron making industry had basically "cracked" if you like the fundimentals of iron extraction and iron making.

You may think that they have been using iron since the late stone age but. Since then iron production come on leeps and bounds and the production prcoess has hardlies changed since the 1900.

I predict a maximum of 30 years before the "Inner" core of the iron is penertrated by the various bacteria that live and thrive on the bacteria inside the iron. The storboard bow has started to corrode and the outer shell has started to crumble.

I would like to explain though that as iron crumbles and corodes the compacting materials will strengthen the structure for maybe 2-3 years at the maximum. Many artefacts will survie long after our life time. And by then most objects will have been covered by the dense silt which also helps preserve relics of certain composistion.

I could go into various compounds which would survie in these cold and acidic conditions. But i think many of you are thinking i am a big enough nerd already.

Thanks S-Park.

If you have any questions or i have not explained my delf enough please tell me.