Observations of Current Distribution

In electrochemical protection the necessary range of protection current is achieved by an appropriate arrangement of the electrodes. It follows that measures which raise the polarization resistance are beneficial. Coated objects have a coating resistance (see Section 5.2), which can be utilized in much the same way as the polarization resistance in Eq. (2-45). Therefore, the range in the medium can be extended almost at will by coatings for extended objects, even at low conductivity. However, the range is then limited by current supply to the object to be protected (see Section 24.4). 

Even for high-resistance media with x = 10 S cm , sufficient protection is obtained with only A0 = 0.1 V from the criterion of Eq. (2-40) -J = 0.14 7 

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