Corrosion Evolution of Reinforcing Steel in Concrete under Dry/Wet Cyclic Conditions Contaminated with Chloride

J. Mater. Sci. Technol. ›› 2012, Vol. 28 ›› Issue (10): 905-912.

• Iron and Steel • Previous Articles Next Articles

Corrosion Evolution of Reinforcing Steel in Concrete under Dry/Wet Cyclic Conditions Contaminated with Chloride

J. Wei, X.X. Fu, J.H. Dong, W. Ke

State Key Laboratory of Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

Received:2011-05-13 Revised:2011-07-16 Online:2012-10-30 Published:2012-10-30
Contact: J.H. Dong

Abstract

Abstract:

The corrosion evolution of rebar in concrete was monitored by electrochemical impedance spectroscopy (EIS) under dry/wet alternated accelerated corrosion test. Four stages with different dynamic characteristics were observed during the corrosion evolution. They were passive stage, local corrosion controlled by the charge transfer step, accelerated corrosion controlled by the mass transfer step, and constant rate corrosion controlled by the mass transfer step through a barrier layer. X-ray diffraction (XRD) analysis showed that the corrosion product of rebar in mortar was composed of α-FeOOH, γ-FeOOH and Fe₃O₄. The corrosion mechanisms of all four stages were discussed and the corrosion reactions were proposed according to the corrosion product and corrosion evolution characteristics.

J. Wei, X.X. Fu, J.H. Dong, W. Ke. Corrosion Evolution of Reinforcing Steel in Concrete under Dry/Wet Cyclic Conditions Contaminated with Chloride[J]. J. Mater. Sci. Technol., 2012, 28(10): 905-912.

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Corrosion Evolution of Reinforcing Steel in Concrete under Dry/Wet Cyclic Conditions Contaminated with Chloride

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