Effect of Calcium Phytate on the Corrosion Behavior of 304 Stainless Steel as Coral Concrete Reinforcement in a 3.5% Sodium Chloride solution

The corrosion-inhibition behavior of calcium phytate on AISI 304 stainless steel in coral concrete is investigated by application of open circuit potential, linear polarization resistance, and electrochemical impedance spectroscopy. The results suggest that calcium phytate increases the open circuit potentials, polarization resistance, and charge transfer resistance of 304 stainless steel in chloride-contaminated coral concrete. Corrosion of the stainless steel rebar can be effectively suppressed by calcium phytate, which can be reduced by 90% via the addition of 0.1% of calcium phytate. Calcium phytate mainly promotes passivation and inhibits corrosion of the reinforced stainless steel, and it does not influence the coral concrete layers.