A time-saving method to assess the efficiency of corrosion inhibitors by electro osmosis

Chun-lei Geng1,2) and Duan Weng1) 1) Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, China 2) Beijing Building Materials Academy of Sciences Research (State Key Laboratory), Beijing 100041, China

摘 要：The corrosion inhibitor is one of the most important technologies to enhance the durability of steel-reinforced concrete. A kind of time-saving method was developed to assess the inhibitor efficiency by using a 32 V electric field to accelerate chloride ion migration in concrete. Potentiodynamic polarization scanning test was used to evaluate the corrosion states. The comprehensive efficiency of an inhibitor should be assessed in two aspects: resistance to chloride ion permeability and inhibiting efficiency. The specimens with different mixing amount of sodium nitrite and migration corrosion inhibitors were used to verify the accuracy and reliability of this method. The results show the differences in inhibiting efficiency of the inhibitors clearly, indicating the reliability of this time-saving method.

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