Effetto dell’intermittenza della corrente di protezione nei sistemi di protezione catodica dell’acciaio

摘要

The paper reports the results of a preliminary research study on the effects of protection current intermittenceudon the cathodic protection conditions of buried or immersed pipelines. It is well known that cathodic protectionudhas chemical and electrochemical beneficial effects on carbon steel, which do not disappear instantly inudcorrespondence to the current interruption. According to this premise, laboratory tests of intermittent cathodicudprotection in which the current has been interrupted cyclically were carried out on carbon steel specimens inudsoil-simulating solution. The effects of the duration of the current-off time, the number of on-off cycles, and ofudthe applied current density have been studied. Potential has been monitored weekly and the residual corrosionudrate was calculated by means of a simple electrochemical model.