Effect of Low Alloying on the Corrosion Resistance of Rebars to Chloride Ions
The corrosion behavior of HRB400 bars and two types of low-alloyed,corrosion-resistant rebars in a 0.34 mol/L NaCl solution was investigated using electrochemical open-circuit potential,potentiodynamic polarization curve,impedance spectrum,and periodic infiltration test.Experimental results indicate that compared to ordinary HRB400 steel bars,the low alloyed corrosion-resistant steel bars exhibit a positive shift trend in open circuit potential value,indicating higher thermodynamic stability.These bars also have a positive self-corrosion potential with lower self-corrosion current density and significantly increased polarization resistance.Relative electrochemical corrosion rates are only 58％and 68％when compared to HRB400 rebar.In the periodic infiltration test,the relative weight loss of both types of low-alloyed corrosion-resistant rebar is only 63％when compared to HRB400 rebar.Adding small amounts of alloying elements can effectively reduce the rate of rebar corrosion.
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