It is almost universally accepted that a steel structure under cathodic protection is fully protected if the potential is at least 0.85-volt negative, referred to a standard copper-saturated copper sulfate electrode placed in the electrolyte immediately adjacent to the metal surface.
The entire structure is fully protected, of course, only if this criterion is met at every point on the surface. This is not a minimum requirement; it is a maximum. In other words, it is almost certainly true that protection is complete when this is achieved. It is also possible to have complete freedom from active corrosion at lower potentials.
The entire structure is fully protected, of course, only if this criterion is met at every point on the surface. This is not a minimum requirement; it is a maximum. In other words, it is almost certainly true that protection is complete when this is achieved. It is also possible to have complete freedom from active corrosion at lower potentials.
Source: Parker, M.E, & Peattie. E.G., Pipe Line Corrosion and Cathodic Protection, Elsevier Science, 1999
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