2002 Volume 51 Issue 4 Pages 148-152
Effects of phosphates for macro-cell corrosion inhibitors in concrete solution were examined by using corroding bipolar electrode against floated current carrying electrodes. When using CaHPO4 and Ca (H2 PO4)2 for inhibitor, the corrosion electrode open-circuit potential was higher than using CaWO4, CaMoO4 and blank solution, was lower than using Ca (NO2)2. But the reaction resistance of calcium phosphates estimated from AC impedance measurement was higher than the other inhibitor. CaHPO4 and Ca (H2PO4)2 showed good performance as inhibitor in macro-cell environment.
