. Electrolysis and its mitigation. . kind is frequently en-countered where pipes are embedded in soils containing cindersin which particles of coke may be found. Galvanic action of this kind also takes place as a secondaryaction following electrolysis from stray currents. If stray cur-rents are discharged from a pipe producing initial corrosion, thecorroded iron thus carried into solution in the soils comes in con-tact with oxygen dissolved in soil water which results in the pre-cipitation of iron oxide on the surface of the pipe. This ironoxide is a conductor of electricity, and it also exhib
. Electrolysis and its mitigation. . kind is frequently en-countered where pipes are embedded in soils containing cindersin which particles of coke may be found. Galvanic action of this kind also takes place as a secondaryaction following electrolysis from stray currents. If stray cur-rents are discharged from a pipe producing initial corrosion, thecorroded iron thus carried into solution in the soils comes in con-tact with oxygen dissolved in soil water which results in the pre-cipitation of iron oxide on the surface of the pipe. This ironoxide is a conductor of electricity, and it also exhibits an electro-motive force against iron, as in the case of the piece of , where iron oxide is thus deposited on the surface of theiron at any point, corrosion may continue to some extent eventhough the stray currents which initiated the trouble have beenremoved. Self-corrosion may also occur from galvanic actiondue to physical differences between different points of the surface Bureau of Standards Technologic Paper No. 52. Fig. i.—Example of electrolytic corrosion
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