Corrosion resistance of steel bars prepared by non-heating direct rolling process in simulated concrete pore solution
Corrosion resistance of direct rolling of free-heating(DROF)steel bars and traditional hot rolling(THR)steel bars in simulated concrete pore solution was studied using electrochemical testing and immersion testing.The results show that compared with the THR steel bars,the DROF steel bars have finer grain size,in different concentrations of Cl-solution,the DROF steel bars have lower self corrosion current density,higher self corrosion potential and higher impedance value,and better corrosion resistance.The corrosion mass loss experiment shows that the corrosion pits on the surface of the DROF steel bars matrix are small,and it has a lower corrosion rate and fewer pitting pits.The main components of corrosion products on the surface of the sample are Fe3O4,Fe2O3,α-FeOOH and γ-FeOOH.
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