EFFECTS OF CATHODIC PROTECTION ON CORROSION OF Q235 STEEL IN SRB CONTAINING SOILS
含硫酸盐还原菌土壤中阴极保护对Q235钢腐蚀的影响

The effects of sulfate reducing bacterial(SRB) on cathodic protection of Q235 steel in soils have been studied,using bacterial analyses,electrochemical impedance spectroscopy(EIS),scanning electron microscopy (SEM) and EDS.The results showed that with increasing applied cathodic potential,pH value of soil gradually increased,the number of SRB and corrosion rate of Q235 steel decreased,and cathodic protection efficiency increased.At a cathodic potential of-1050 mV,SRB could still survive in soil around the sample of Q235 steel.At the same cathodic potential,the cathodic protection efficiency in soil without SRB was higher than that with SRB,and the corrosion rate of Q235 steel in soil with SRB was obviously larger than that without SRB.At the same cathodic potential,the cathodic current density needed for Q235 steel in soil with SRB was also larger than that without SRB.