The Galvanic Cathodic Protection system problem lies in its capacity to drive an adequate protective protection current from the galvanic anode to the embedded steel reinforcement. This study investigates the reaction mechanism, based on Electrochemical Impedance Spectroscopy (EIS), of the cathodic protection system by thermo sprayed zinc anodes to which LiBr and H2O have been added as humectants. Six reinforced slabs were tested. The specimens were placed in two different Relative Humidity cells. Electrochemical Impedance Spectroscopy and conventional electrochemical properties such as potential, galvanic current and polarization decay of the anode were routinely measured over a 150 days after the humectants addition. It was found that the LiBr notably improved the protective galvanic current; however this improvement was only temporary. Relative humidity had a greater impact than the LiBr addition on the concrete's resistivity.
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