DERUSTING CHEMICAL 1. Phosphoric Acid: Phosphoric acid is effective at removing rust by converting iron oxide into a water-soluble phosphate compound. It is relatively safer to use compared to stronger acids like hydrochloric acid. 2. Citric Acid: Citric acid is a mild acid that can be used for derusting. It works by chelating iron ions from the rust, making it easier to remove. 3. Acetic Acid (Vinegar): Vinegar, which contains acetic acid, can also be used to remove light rust. It's a gentler option but may require longer soaking times. 4. Oxalic Acid: Oxalic acid is another effective derusting agent that forms water-soluble complexes with iron oxides, facilitating rust removal. 5. Rust Converters: These are chemicals that convert iron oxide (rust) into a more stable compound, such as iron tannate or iron phosphate, which can be painted over. 6. Commercial Rust Removers: There are many commercially available rust removers that often contain a blend of acids or other chemicals designed to dissolve rust quickly.