Derusting Chemical Derusting Chemicals for Removing Rust There are several types of derusting chemicals based on their composition and application methods: * Acid-Based Derusting Chemicals These are strong rust removers that dissolve rust chemically. 1 Phosphoric Acid (H₃PO₄): Converts rust (iron oxide) into iron phosphate, which can be painted over. - Example: Phosphoric acid-based rust converters (e.g., Rust-Oleum Rust Reformer). 2. Hydrochloric Acid (HCl): Fast but aggressive; can damage metal if not neutralized properly. - Example: Muriatic acid solutions. # Derusting Chemical Manufacturer.