STUDY ON THE EFFECT OF CHLORIDE IONS ON THE PASSIVE FILM ON REINFORCING STEEL IN SIMULATED CONCRETE PORE SOLUTIONS BY ELECTROCHEMICAL TECHNIQUES

Acta Metall Sin

2008, Vol. 44

Issue (3): 346-350 DOI:

Research Articles

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STUDY ON THE EFFECT OF CHLORIDE IONS ON THE PASSIVE FILM ON REINFORCING STEEL IN SIMULATED CONCRETE PORE SOLUTIONS BY ELECTROCHEMICAL TECHNIQUES

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. STUDY ON THE EFFECT OF CHLORIDE IONS ON THE PASSIVE FILM ON REINFORCING STEEL IN SIMULATED CONCRETE PORE SOLUTIONS BY ELECTROCHEMICAL TECHNIQUES. Acta Metall Sin, 2008, 44(3): 346-350 .

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Abstract Potentiodynamic anodic polarization, electrochemical impendence spectroscopy and Mott－Schottky plot were used to study the effect of passive potentials and chloride ion concentrations on the corrosion behavior of reinforcing steel in simulated concrete pore solutions. The results indicated that the compact passive films were formed on the reinforcing steel surface at different passive potentias from -0.200V to 0.200V vs SCE for 4800s, the superficial donor densities decreased with the potential while the deep donor densities increased with the potential, and the charge transfer resistance of the film reached the highest value at the passive potential 0.200V. Immersed in simulated concrete pore solutions with chloride ion concentration 0.01～0.08mol/L and pH12.50 for 24h, the passive film still behaved as n-type semiconductor, only one type of donor appeared from the Mott－Schottky plot, and the deep donor densities decreased with chloride ion concentrations.

Key words: reinforcing steel passive film chloride ion EIS Mott－Schottky plot

Received: 13 August 2007

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