In a odd, or maybe not, coincidence, the title is very close to this movie, which I think is the most moving, haunting anti-war movie I've ever seen.
If you look on YouTube you'll find the whole movie there.
Rust, also known as Iron Oxide, is formed by a chemical reaction in which Iron oxidizes when in the presence of Oxygen and water or excessive moisture. Iron Oxide lacks many of the structural characteristics of the original Iron material and will continue to spread deeper into the material. If left alone, rust will almost always result in total failure of the panel or component affected. It should be noted that once Iron has been converted to Iron Oxide, it cannot be changed back. Thus, even if converted to a more stable compound as in the case of a rust converter, there will still be a permanent decrease in the physical properties of the component affected.
How a Rust Converter Works in Theory
Rust converters are designed to neutralize existing rust as well as prevent it from advancing its damage. The active ingredient in most rust converters is Tannin, in the form of tannic acid. This tannic acid combines with the Iron Oxide to form a more stable compound called Iron Tannate, which is typically black in color compared to the reddish color of rust. Many commercial rust converters will include both a polymer to act as a protective layer, and an additional acidic compound designed to accelerate the chemical processes related to the tannic acids. One such acid, known as Phosphoric acid may also work as a rust converter itself, by reacting with the Iron oxide and converting it to black ferric phosphate.