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| − | ==What causes pitted rust==
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| − | Rust pitting is caused by a localized lack of oxygen in metal. This causes a small area to become anodic (it readily gives up electrons), while the slightly more oxygen-rich surrounding area becomes cathodic (readily accepts electrons), accelerating the local formation of rust.
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| − | Pitted rust can be more insidious than surface rust. While the pits may comprise only a small volume of a piece of metal, the widespread perforation can compromise the overall structure of the metal.
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| − | ==How to fix pitted rust==
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| − | The "best" way to fix pitted rust on body panels is to generously cut out the rusted area, and weld in new metal. This is not always a viable option for all people, in all situations. A more common solution is to remove the rust, mechanically and/or chemically, clean the panel thoroughly, fill the pits with a purpose-specific finish product, and coat with [[epoxy primer]].
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| − | ===Removing the rust in the pits===
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| − | First, all visible rust must be removed
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| − | ====Mechanical removal of pitted rust====
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| − | *A spot blaster is useful for this, with silica as the medium (confirm, and get list of other acceptable media).
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| − | *Also, the following can be used: metal brush, grinding wheel, die grinder, a wire wheel on a drill. (what 3M discs are recommended for this?)
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| − | ====Chemical removal of pitted rust====
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| − | ==Additional resources==
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| − | *[http://www.materialsengineer.com/G-Pitting-Corrosion.htm]
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| − | *[http://www.corrosion-doctors.org/Forms-pitting/Pitting.htm Pitting corrosion]
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| − | *[http://en.wikipedia.org/wiki/Pitting_corrosion Pitting corrosion]
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| − | *[http://www.corrosion-doctors.org/Forms-pitting/shapes.htm Corrosion pit shapes]
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