Plastic pipe does not rust, brass does not rust, copper does not rust. Stainless steel does not rust, lead pipe does not rust.
Black pipe is used mainly for gas lines. Like it's name it is black in color and made from a heavy gauge steel. Galvanized pipe is pipe that has been coated with a material that reduces the effects of rust. It is silver in color.
It will rust fairly quickly causing brown water and over time will rust through and leak.
Hot water pipe rust first as compared to the cold water pipe for the same chemical composition of the water.
yes
Rust is a chemical compound but can be associated also with other compounds.Lead (Pb) has no rust.
they rust
Physical
What kind of pipe? Is this area exposed to acid rain?
Black pipe is an amateur term for common steel or iron pipe.
Copper can rust
Lead won't rust in the same way as iron, a white oxide layer will appear overtime, but it won't break away as much as rust on iron.