Quan Jiang

Electrochemical Charaterization of Steel Concrete under Multi-Factors Influence

The corrosion of steel concrete under the multi-factor of hygrothermal marine environment and flexural stress-salt spray accelerated corrosion environment was studied by potentodynamic polarization method and electrochemical impedance spectroscopy. Under the hygrothermal marine environment (Wan-ning), with the prolonging of period, passive film on the steel was depolarized, and when the period was two years, the steel started corrosion. The result show that flexural stress could accelerate chlorine ion permeation rate on the concrete, and make passive film depolarize more early. With the passive film’s depolarization, the interfacial reaction of steel/concrete develops from electrochemical activation to mass transport limitation, and the reaction resistance decrease.