Cathodic protection for storage TanksFull description
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Small write up about cathodic protectionFull description
Small write up about cathodic protectionFull description
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condenser Cathodic Protection
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Deepwater offkhore structures am now quite corumom however a deep water development project still &uims significant capital investment on the part of the operator. Corrosion failure is not …Full description
Steel-to-soil potential of buried steel is lower in poorly aerated soil (low oxygen content) than in well aerated soil (high oxygen content). In this case, the paved road lowers the oxygen concentration in the soil around the pipeline, this section of pipeline becomes anode in the differential corrosion cell and being corroded. In practice, good aeration and high electrical resistivity usually correspond to low moisture content.less corrosion.
In anaerobic soils, e.g.clay, sulphate-reducing bacteria may be active. These micro-organisms, which can exist in active form only in the absence of free oxygen, obtain their energy from the following reaction:
So4-2 +8H = H2S + 2H2O +2OH-1 Bacteria corrosion of iron and steel under anaerobic conditions is usually rapid and severe. This kind of attack can often be recognized by the bright appearance of the corroded surface and the rotteneggs odor. Since many H atom are eaten by SO 4, more electrons are needed to produce H atom,so, more negative of protection potential is required.