Rapid oxidation occurs when heated steel is exposed to air Rust scale forming and flaking off from a steel bar heated to its forging temperature of 1200☌. Although rusting is generally a negative aspect of iron, a particular form of rusting, known as stable rust, causes the object to have a thin coating of rust over the top, and if kept in low relative humidity, makes the "stable" layer protective to the iron below, but not to the extent of other oxides such as aluminium oxide on aluminium. Rebar used in underwater concrete pillars, which generates green rust, is an example. Other forms of rust include the result of reactions between iron and chloride in an environment deprived of oxygen. Several forms of rust are distinguishable both visually and by spectroscopy, and form under different circumstances. Many other metals undergo similar corrosion, but the resulting oxides are not commonly called "rust". Rusting is the common term for corrosion of elemental iron and its alloys such as steel. Surface rust is commonly flaky and friable, and provides no passivational protection to the underlying iron, unlike the formation of patina on copper surfaces. Given sufficient time, any iron mass, in the presence of water and oxygen, could eventually convert entirely to rust. nH 2O) and iron(III) oxide-hydroxide (FeO(OH), Fe(OH) 3), and is typically associated with the corrosion of refined iron.Rust consists of hydrous iron(III) oxides (Fe 2O 3 Rust is an iron oxide, a usually reddish-brown oxide formed by the reaction of iron and oxygen in the catalytic presence of water or air moisture. JSTOR ( June 2012) ( Learn how and when to remove this template message).Unsourced material may be challenged and removed. Please help improve this article by adding citations to reliable sources.
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