By John H. Morgan
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Extra info for Cathodic Protection
Which can be prevented by cathodic proteciion, as can the corrosion of the in condenser and heat exchanger tubes at the same potentials that protect steel. alloys used Half Cell Position Protection Criteria The criteria of protection are established as potential changes or particular potentials relative to a standard reference electrode. Equally essential is a definition of the position of the reference, or swing test, electrode during the potential measurements. As indicated earlier, there will be a change in potential of any corroding structure relative to variously positioned half cells.
18. If, as is often the case in practice, the two rods of metal are physically joined together, then the electrical path will have zero resistance and the driving potential of the cell, Ea - Ed, will be used to drive the electrolytic current only. This will meet a resistance 41 R , at the anolyte and R, at the catholyte, so that the value of the cell current will be The rate of corrosion per unit area will be proportional to the current density at the anode and this figure is of greater practical significance than the actual cell current.
T o maintain this film it is essential that there is a supply of oxygen to the surface. This condition is achieved under anodic, not cathodic, conditions and there is considerable experience of successful anodic protection of stainless steel. Under cathodic conditions the supply of oxygen to the cathode is diminished. Small cathodic changes of 100 mV can destroy the oxide film on stainless steels and render them liable to corrosion. A further potential change, while destroying the natural protection of the oxide film, protects the steel by the normal cathodic protection processes.