What happens when phosphoric acid and iron oxide react together? It depends on which iron oxide is used. If it is FeO, the reaction does not occur much, because iron phosphate is not very soluble and therefore forms a protective layer on the solid. If it is Fe2O3, it dissolves softly. The behavior of mixed oxides depends on their physical condition. The reaction of iron oxide and phosphoric acid is a conversion reaction that results in the production of iron phosphate + water.
3FeO (s) + 6H + (aq) → 3Fe2 + (aq) + 6H2O (l)
Rusting is what happens when you oxidize a metal. For example, Fe 2 O 3 is formed on Fe. (When it comes to iron or steel), acid can dissolve rust. (Fe 2 O 3) causes more oxidation of the metal, more rust formation and rust dissolution. When acid reacts with metal, it tends to dissolve both rust and metal to form iron chloride. However, if you were to use dilute acid carefully, you could dissolve the rust before the metal dissolved. Some acids eliminate rust (oxides), while others cause rust. Phosphoric acid (H 3 PO 4) is an acid that, by converting it (iron oxide III) to a soluble form in water, removes rust. Most other strong acids cause rust. Please note that some deodorants contain hydrofluoric acid (HF), which is very dangerous because it can penetrate your skin, destroy bone and cause a heart attack without even feeling it. Be. If you use any type of rust remover, read the label carefully and always wear goggles, chemical resistant gloves and protective clothing Unspoken Phosphoric Acid.
Phosphoric acid is used in many experimental applications and can come into contact with many chemical and petrochemical equipment. Most of these equipments are made of steel alloys that may be damaged due to contact with acid. Corrosion inhibitors can be used to protect steel alloys against various shapes and corrosion environments. Organic inhibitors form well corrosion inhibitors and are widely used. The use of inorganic inhibitors is not as good as organic matter. They are applied in some coatings to improve the corrosion resistance of stainless steel. Other alloys can prevent corrosion if the coating is effective. Before coating, rust can be removed using some simple chemical techniques to create an optimal surface. Stainless steel is usually characterized by its ability to resist corrosion in a variety of environments. Unfortunately, stainless steel is not completely stainless, but is more resistant to corrosion. Exposure to high salinity, such as seawater, can destroy its protective layer, which can cause rust or corrosion of stainless steel, the so-called free iron on the surface. This iron Residues can come from a variety of sources, such as tool particle transport, that remain after that and are very sensitive to corrosion if not properly controlled. Any pre-existing surface corrosion can reduce the performance of the coated parts. Even minor rust should be removed before coating. Phosphoric acid is used to do this. Phosphoric acid will dissolve iron oxide without attacking other steel components (chromium). The rust is resolved by the following reaction:
2 𝐻3𝑃𝑂4 + 𝐹𝑒2𝑂3 → 2 𝐹𝑒𝑃𝑂4 + 3𝐻2𝑂
It can be used because of its non-invasive nature. After using phosphoric acid, clean the area. Purification is done by thoroughly washing the parts in ionized water and then returning to the coating. This method is not 100% effective in all forms of iron oxide and other cases. Surface preparation treatment may be necessary.