Citation: YANG Rong-Jie, GUO Ya, TANG Fang-Miao, WANG Xiao-Ping, DU Rong-Gui, LIN Chang-Jian. Effect of Sodium D-Gluconate-Based Inhibitor in Preventing Corrosion of Reinforcing Steel in Simulated Concrete Pore Solutions[J]. Acta Physico-Chimica Sinica, ;2012, 28(08): 1923-1928. doi: 10.3866/PKU.WHXB201205292 shu

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

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 Date: 28 April 2012
Available Online: 29 May 2012
Fund Project: 国家自然科学基金(21073151, 21173177, 50731004, 21021002) 资助项目 (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.
- Reinforcing steel,
- Simulated concrete pore solution,
- Compound corrosion inhibitor,
- Electrochemical technique,
- HSAB Theory
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