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 E-mail:rgdu@xmu.edu.cn
  • Supported by:

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

Abstract:

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

MSC2000: 

  • O646