Acta Phys. -Chim. Sin. ›› 2012, Vol. 28 ›› Issue (08): 1923-1928.doi: 10.3866/PKU.WHXB201205292

• ELECTROCHEMISTRY AND NEW ENERGY • Previous Articles     Next Articles

Effect of Sodium D-Gluconate-Based Inhibitor in Preventing Corrosion of Reinforcing Steel in Simulated Concrete Pore Solutions

YANG Rong-Jie, GUO Ya, TANG Fang-Miao, WANG Xiao-Ping, DU Rong-Gui, LIN Chang-Jian   

  1. State Key Laboratory of Physical Chemistry of Solid Surfaces, Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, Fujian Province, P. R. China
  • Received:2012-04-28 Revised:2012-05-29 Published:2012-07-10
  • Contact: DU Rong-Gui
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (21073151, 21173177, 50731004, 21021002).


The corrosion behavior of reinforcing steel in simulated concrete pore solutions with and without corrosion inhibitors was studied by electrochemical techniques and scanning electron microscopy (SEM). A combined inhibitive effect of sodium D-gluconate, Na2MoO4 and thiourea on restraining the corrosion of reinforcing steel immersed in the solution was observed. This result showed that there was a synergetic effect among the three agents in corrosion prevention. After adding the compound inhibitor (750 mg·L-1 sodium D-gluconate, 250 mg·L-1 Na2MoO4, 500 mg·L-1 thiourea) into the simulated concrete pore solution containing 3.5% (w) NaCl, the inhibition efficiency of the compound inhibitor was 94.5%. According to the Hard and soft acids and bases (HSAB) theory, the compound inhibitor worked by forming a protective film on the steel surface.

Key words: Reinforcing steel, Simulated concrete pore solution, Compound corrosion inhibitor, Electrochemical technique, HSAB Theory