Generally, iron oxides are prevalent and widely used as they are inexpensive and play an imperative role in many biological and geological processes. They are also extensively used by humans, e.g., as iron ores in thermite, catalysts, durable pigments (coatings, paints, and colored concretes), and hemoglobin. Rusting is an oxidation reaction. The iron reacts with water and oxygen to form hydrated iron(III) oxide, which we see as rust. Iron and steel rust when they come into contact with water and oxygen – both are needed for rusting to occur. Experts at the University of Illinois at Urbana-Champaign agree that a little rust on cookware will not likely harm you. (Even rust in drinking water isn't considered a health hazard.) Iron oxides are considered safe in cosmetics and personal care products because they are non-toxic and non-allergenic. Those with sensitive skin will tolerate iron oxides.
At least 18 types of bacteria are classified as iron, long thread-like bacteria that "feed" on iron and secrete slime. Unlike most bacteria, which feed on organic matter, iron bacteria fulfill their energy requirements by oxidizing ferrous iron into ferric iron. Because oxide films produced by iron corrosion are not self-healing, coatings and cathodic protection methods are generally used to protect ferrous surfaces. When iron is exposed to moisture and oxygen, it becomes corroded, an oxidation process involving a loss of electrons. Iron oxide is an important biological agent that has a key role in medical processes; however, the mechanism whereby it provides iron for human and animal cells and its biological uses remains unclear. If you are looking for high quality, high purity and cost-effective iron oxide, or if you require the latest price of iron oxide, please feel free to email contact mis-asia.