Oxalic acid can completely restore the rust, turning the rust into ferrous oxalate. After being washed with water, it becomes as bright as a new one. And the surface metal treated with oxalic acid has been passivated and isn’t easy to get rust again.

The main difference is in corrosion resistance, stability toughness, thermal conductivity, and mechanical properties, as well as a different field of use and different applications.

Stainless steel and its price are directly proportional. The price of 201 stainless steel is relatively low than 304 stainless steel, but it is also easy to rust.