Cathode Effects in Anodic Protection^★ Available to Purchase

The increasing use of anodic protection for corrosion control in chemical storage and handling systems has created a need for a better understanding of the role played by the cathode in the anodic passivation process. The effect of cathode geometry on the potential gradients induced in the chemical system by the passivation current and the effects of these potential gradients on the passivation process have been studied. Experiments were conducted with cathodes of various length-to-diameter ratios to measure potential gradients through a chemical solution and along an anodically passivated surface at various distances from the cathode. The effect of current density also was investigated. Measured results are compared with theoretical predictions and application to practical situations is discussed.