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Iron rusts when iron (metal) is exposed to oxygen gas in the presence of water. The process is faster when other ions are available to the reaction (such as chloride) to make soluble iron salts which wash away exposing more iron, or when the rust that is formed is dissolved with an alkaline solution.
Iron exposed to seawater mists, which ire water based alkaline aerosols containing sodium chloride and other ions, should corrode as fast as it can. For good measure the wind blown sand would physically erode the metal and bright sunny days would speed up the reactions through thermal erosion, and ultraviolet stimulation of the metal surface.

(Read more: http://wiki.answers.com/Q/Why_iron_objects_close_to_the_sea_rust_faster#ixzz1xeoMcWlj)

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Additional Photos by Vasilis Protopapas (vasilpro) Gold Star Critiquer/Gold Star Workshop Editor/Gold Note Writer [C: 2742 W: 87 N: 5139] (41801)
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