MIL-HDBK-1004/10
Figure 20
Interference Due to Potential Gradients
5.2.1.1
Detecting Interference. Cathodic protection interference problems
are most commonly detected through the measurement of structure-to-electrolyte
potentials and by the measurement of current flowing along a structure by
measuring the potential (IR) drop caused by the flow of the current through
the resistance of the structure.
Interference is most commonly detected during the measurement of
structure-to-electrolyte potential measurements. Figure 21 shows a typical
situation where interference is occurring and shows locations where structure-
to-electrolyte potentials have been measured. Table 7 shows the potential
measurements, which are also plotted in Figure 22. As can be seen in Figure
23, the location of the foreign structure can be easily determined by its
influence on the protected structure. Likewise, the measurements taken on the
foreign structure clearly show the areas where the ions are picked up and
discharged.
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