If the packaged items are rusty, will the rust not continue to expand after being wrapped with anti-rust packaging film?

If there is already rust on the surface of the packaged item, after packaging with anti-rust packaging film, the further expansion of the rust is usually inhibited, but it cannot completely prevent the existing rust from continuing to develop. Anti-rust packaging films, especially VCI (Vapor Phase anti-rust agent) films, form a protective atmosphere in a closed space by releasing anti-rust agents, preventing moisture, oxygen and contaminants in the air from coming into contact with the metal surface, thereby effectively preventing new corrosion. However, for the rust that has already formed, the main function of the anti-rust film is to inhibit the further intensification of the oxidation process, but it cannot reverse the rust that has already occurred. If there is severe rust on the surface of the packaging, the anti-rust film can reduce the further impact of the external environment on the rust, but the anti-rust film cannot directly remove or repair the existing rust layer. The spread of rust usually depends on external environmental factors such as moisture and oxygen. If the anti-rust film can effectively isolate these factors, it can effectively slow down or prevent the further spread of rust. Therefore, although anti-rust films can protect the metal surface to a certain extent and prevent further deterioration of rust, in cases of severe rust, the best practice is still to clean and treat the surface first, and then use anti-rust films for long-term protection