Rust preventive oil is a protective coating applied to metal surfaces to block moisture, oxygen and salts. It leaves a thin oily, waxy or dry-to-touch film that slows corrosion while parts are machined, stored or shipped, and it can be removed again before painting, plating, welding or assembly.
What rust preventive oil is made of
A typical rust preventive oil has four parts: a base oil (mineral or synthetic) that forms the film, rust-inhibiting additives that adhere to the metal, a solvent that controls viscosity and drying speed, and supporting additives such as antioxidants and defoamers.
Why metal rusts
Iron-based metals rust when oxygen and water reach the surface, and salts or acids speed the reaction. A rust preventive film works by keeping those three away from the metal and by chemically bonding polar inhibitor molecules to the surface.
Main types
By film: soft oily films, fast-drying thin films, waxy films and hard films. By carrier: solvent-based, oil-based and water-based. MOERY’s range covers fast-drying thin films (KG-1 to KG-6), long-term films (KG-8, KG-9), a water-displacing grade (KG-10) and hard-film grades (KGY series).
Where it is used
Typical uses include in-process protection between machining steps, finished-part storage, long-term equipment preservation and export packing for machinery, automotive and precision components.
Frequently asked questions
Is rust preventive oil the same as lubricating oil?
No. Lubricants reduce friction; rust preventive oils protect metal from corrosion. Some products do both, but a lubricant alone is not a reliable corrosion barrier.