Electrochemical impedance monitoring of carbon fiber as an anode material in cathodic protection

In impressed Current CP systems, an insoluble anode is used on the Surface or within the concrete structure. The most frequently and widely used anode material is titanium covered with noble metal oxides. Meanwhile much work is carried out to replace the anode material or improve the application technique such as using conductive coatings and paintings. In this regard, carbon fiber meshes have been introduced as an alternative for the last decade. Unfortunately, scientific work and publications concerning electrochemical properties of carbon embedded in concrete are scarce. Hence, a series of experiments have been designed and carried out in order to improve knowledge of its behavior as anode. One of these tests is to monitor the behavior of carbon by means of Electrochemical Impedance Spectroscopy (EIS) measurements. After carbon was polarized in different potential values, EIS have been done. Also effect of addition of 1 and 3 percent chloride ions has been investigated.