Rust is composed of iron oxides. In colloquial usage, the term is applied to red oxides, formed by the reaction of iron and oxygen in the presence of water or air moisture. Other forms of rust exist, like the result of reactions between iron and chloride in an environment deprived of oxygen – rebar used in underwater concrete pillars is an example – which generates green rust. Several forms of rust are distinguishable visually and by spectroscopy, and form under different circumstances. Rust consists of hydrated iron(III) oxides Fe2O3·nH2O and iron(III) oxide-hydroxide FeO(OH)·Fe(OH)3.

Given sufficient time, oxygen, and water, any iron mass will eventually convert entirely to rust and disintegrate. Surface rust is flaky and friable, and provides no protection to the underlying iron, unlike the formation of patina on copper surfaces. Rusting is the common term for corrosion of iron and its alloys, such as steel. Many other metals undergo equivalent corrosion, but the resulting oxides are not commonly called rust.

Read more about Rust:  Prevention, Economic Impact, Cultural Symbolism

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Famous quotes containing the word rust:

    Do not store up for yourselves treasures on earth, where moth and rust consume and where thieves break in and steal, but store up for yourselves treasures in heaven...
    Bible: New Testament, Matthew 6:19,20.


    But lay up for yourselves treasures in heaven, where neither moth nor rust doth corrupt, and where thieves do not break through nor steal.
    Bible: New Testament Matthew 6:20.

    So summer comes in the end to these few stains
    And the rust and rot of the door through which she went.
    The house is empty. But here is where she sat
    To comb her dewy hair, a touchless light,
    Perplexed by its darker iridescences.
    Wallace Stevens (1879–1955)