It prevents & delays rusting of iron and steel objects, or the permanent protection against corrosion. Typically, the protection achieved by a process of surface finishing or treatment. Depending on mechanical wear or environmental conditions, the degradation may not be stopped completely, unless the process is periodically repeated.
For rust to form, three things are needed: iron contained in metal, water and oxygen from the air. While oxygen is always present, steel does not rust when the air is dry. If steel sheds water quickly, the corrosion does not have time to form, but if metal retains moisture, it rusts. In addition, when steel is subjected to physical stress, such as sudden temperature changes, vibrations, etc., vulnerable areas can form that make iron likely to rust.
It begins as a microscopic form that is not visible to the naked eyes. When it appears, it is too late to act. Also, do not forget about all the hidden areas of your car where rust can develop without you knowing: door panels and hood, rear fenders, frame, uprights and rocker panels. For these reasons, it is important to treat your car once a year to prevent rust from forming.
There are elements that can accelerate the development of corrosion: