Research on corrosion behavior of carbon steel under the interaction between CO2 and Cl
The paper focus on the corrosion behavior of No.20 carbon steel pipeline material in solution system containing CO2 and different concentration of Cl-.The influence of combined action of Cl-and CO2 on corrosion behavior of pipeline material was analyzed by applying electrochemistry testing,chemical immersion as well as a series of characterization techniques.The ex-perimental results revealed that the corrosion rate of carbon steel shows a relatively low value in Cl-solution system.And with the increase of Cl-concentration,the corrosion rate shows an upward trend at first and then tends to be gentle.The combined effect of Cl-and CO2 will significantly increase the corrosion rate of carbon steel.From the perspective of electrochemical testing,im-pedance and polarization testing results are consistent with corrosion rate results of immersion testing.Impedance and polarization testing results indicated that the combined effect of Cl-and CO2 can remarkably reduce arc radius of carbon steel capacitive re-actance,accompanied by a considerable increase in corrosion current density.
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