Schmoldt Engineering Services

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A more effective and positive method of cathodic protection is through the installation of a cathodic rectifier and impressed current groundbed system (fig. 13) instead of with multiple magnesium anodes. By this method an electrolytic cell is developed artificially, where the entire structure to be protected is made to be the cathode of the cell, and the installed groundbed is the anode. The current is made to flow from the groundbed to the structure by converting alternating current power to direct current and impressing the direct current into the earth through the groundbed.

The pipe-to-soil potential test (fig. 14) has been established by corrosion engineers as a standard measurement technique in the evaluation of corrosion control and the degree of cathodic protection applied to buried metallic structures. The copper sulphate half cell reference electrode is most commonly used to contact the soil. Normally, the natural static potentials of unprotected buried steel will vary from -0.30 to -0.80 volts, with reference to the copper sulphate electrode.

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