Creighton Samuiels wrote:
ronie dee wrote:Water H2O isn't what causes rust, it's oxygen O2 that is the culprit.
While this is true as far as that goes, corrosion of metal is an electro-chemical reaction, and requires the water to create an electrical circuit. Without an electrolyte somewhere in the mix, cold steel is unlikely to rust even when exposed to oxygen. This is actually how rust-preventive paints work, because it's easier to keep moisture out than keep oxygen out.
I hope that OP is still not planning to lay the cans sideways as Creighton Samules' post that the cans should be upright is correct. Possibly they should be inverted with the tops down. That said, I think that using cans. filled with cob/clay/dirt, isn't a great way to build a house. It seems that earthships and earth bags - even rammed earth would be far better and tried and proven. There is nothing that will keep these cans from rusting. It will be major labor intensive and probably expensive to even try to keep the cans from rusting. The structural support from the cans is very temporary - so don't count on the cans being structural support for your roof in the long run.
Almost every action that we experience in the universe is a electro - chemical reaction. Rust is an oxidation reduction reaction. Oxygen is reduced and iron is oxidized. Water is not an electrolyte. Electrolyte=mineral=salt. Minerals in the water are electrolytes.
Earthships, earth bags, rammed earth, cob, cord wood, all seem easier and cheaper than steel cans. You can build with cans but do you really want to?