Corrosion Inhibition Effect of D-sodium Gluconate on Reinforcing Steel in Chloride-contaminated Simulated Concrete Pore Solution

摘要

The corrosion inhibition effect and mechanism of D-sodium gluconate for reinforcing steel in the- simulated concrete pore solution containing Cl were studied by electrochemical techniques, includingcorrosion potential, potentiodynamic polarization, and electrochemical impedance spectroscopymeasurements. The results indicate that 0.01 M D-sodium gluconate showed a good corrosioninhibition effect on reinforcing steel in the simulated concrete pore solution containing 0.1 M NaClbecause it strongly hindered the anodic reactions. The inhibition mechanism could be explained on thebasis of the competitive adsorption between gluconate anions and chloride ions on the reinforcing steelsurface. And D-sodium gluconate could eventually form a compact adsorptive film by strong chelationand effectively inhibit the initiation of reinforcing steel corrosion.