Electrochermical Performance of Thermal-Sprayed Composite Sacrificial Anodes in Concrete

The performance of sacrificial anodes of casting alloy and thermal-sprayed alloy were measured in the concretes with different mix proportions and different covering layer thicknesses by electrochemical method. The results showed that the rebars were protected well by all above mentioned alloy anodes in the laboratory conditions. The concrete mix proportion and the covering layer thickness had an impact on the performance of the sacrificial anodes. The anode of thermal-sprayed Zn alloy provided more galvanic current than the casting alloy. The anode of thermal-sprayed Al alloy offered more protection current than that of thermal-sprayed Zn alloy. The anodes of thermal-sprayed alloy showed more exchange current density and more negative corrosion potential than those of casting alloy in concrete.