Rust prevention powder is a water-soluble anti-rust product. In enclosed spaces, vaporized VCI particles penetrate every corner of the metal, forming a molecular-thick protective layer to prevent metal corrosion. Applicable fields: (1) Rust prevention for parts and equipment during transportation and storage. (2) Rust prevention for the inner surfaces of compressors, turbines, cylindrical structural pipelines, storage tanks, boilers, and heat exchangers. (3) Rust prevention for steam condensation pipelines, closed heating and cooling systems. It is suitable for metal rust prevention in covered and enclosed spaces, offering excellent vaporization, diffusion, and adsorption properties. It is particularly effective for rust prevention on hard-to-reach surfaces such as deep holes, slender tubes, bends, and narrow gaps.