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Pitting Corrosion

                                          

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Pitting Corrosion

Pitting is a localized form of corrosive attack.  Pitting corrosion is typified by the formation of holes or pits on the metal surface.  Pitting can cause failure due to perforation while the total corrosion, as measured by weight loss, might be rather minimal.  The rate of penetration may be 10 to 100 times that by general corrosion.

Pits may be rather small and difficult to detect.  In some cases pits may be masked due to general corrosion.  Pitting may take some time to initiate and develop to an easily viewable size.

Pitting occurs more readily in a stagnant environment.  The aggressiveness of the corrodent will affect the rate of pitting.  Some methods for reducing the effects of pitting corrosion are listed below:

  •   Reduce the aggressiveness of the environment

  •   Use more pitting resistant materials

  •   Improve the design of the system

pitting corrosion

   

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Last modified: September 11, 2007