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An anti rust additive is added to liquid lubricants or greases to protect iron and its alloys from oxidation. It acts by physically adsorbing on the surface of the metal to prevent water and oxygen from reaching it. The resulting barrier inhibits the passage of electric current and prevents the formation of a black oxide scale on the metal. Most lubricants contain a corrosion inhibitor, but they are also added to paints and other industrial fluids that have long-term contact with metal components.
Corrosion inhibitor additives are generally classified by their dilution rate and thixotropic nature. Higher dilution rates produce thinner residual films, while lower dilution produces thicker film. This is a key factor in selecting the right anti rust additive for your application.
Anti-Rust 77-K is an economical barium-free, solvent-based mineral oil blend that is combined with efficient organic corrosion inhibitors and water-displacing agents. It is recommended for use on highly finished steel or cast iron components, providing up to two years of protection when stored indoors, uncovered. It also suppresses fingerprint corrosion on aluminum and is compatible with engine oil, making it a good, economical rust preventative for automotive suppliers. Residual films are fingerprint-suppressing and self-healing, and can be removed with alkaline cleaning solutions or via solvent degreasing.
ASCOTRUST(tm) is a range of vapor and flash corrosion inhibitors for use in both solvent-based and waterborne coatings. They can be applied to a rusted substrate and, when dried, will convert the rust into a reaction product that is readily coated by a finish. This is accomplished through a cooperation or coaction, not yet fully understood, between the film-forming material and the citric acid and metal chloride complex, producing in situ a tough durable coating that is better able to accept a finish coating than a bare rusty substrate. They are ideal for protecting metals in hydrostatic testing fluids, in short-term contact with metals (such as temporary metal protection fluids) and heat-transfer fluids used in the automotive and geothermy industries.