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Cathodic Protection
Cathodic protection is the mitigation of corrosion through the means of an
impressed current which may come from a sacrificial anode or from an
external dc power source. Typically, for successful protection there must
be sufficient applied potential to overcome local anodes on the surface of
the material.
In both sacrificial anode and impressed current systems effective life is
a major consideration. Therefore, careful analysis of the intended cathodic
protection system is required. In impressed current systems, over
protection is also a major concern. Other related issues with cathodic
protection are cathodic disbonding of external coatings, external SCC of
pipeline steel and criteria for cathodic protection of both steels and
stainless alloys in both onshore and offshore locations.
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