amazingy the answer is hot humid cimates where the oxide can react with the outside pluatrian of the metal which will start the rust to form.
rust is the result of a combination of moist conditions and oxygen,
damp conditions with ready access to air
soggy and wet conditions can make metal rust
Cool, clear, and calm conditions favor the formation of fog by radiation cooling.
Dry weather, like the desert. Moisture causes rust.
This depends upon environmental conditions.
Typical sewing needles are stainless steel. Normally they do not rust, but can under severe conditions.
Rust will not occur where it is dry and humid
Depends greatly on the conditions where the iron is found.
If you put metal in water it turns rusty basically any condition is possible for rust. All rust needs is oxegen, and that is in the air and also in water
Palladium does not rust. In the narrowest definition, only iron and its alloys rust, but palladium at most under normal conditions might form a thin, protective surface layer that almost no one would call rust.
when there is water and oxygen. like bridges are in.