Study the ability of using anode based on silicon iron alloy in cathodic protection by impressed current for carbon steel in soil
Abstract
Four specimen on basis silicon iron CTT, TTCU, TTU, TTU-V was test corrosion in the soil by mesure rest potential, polarisation potential and electrochemical impedance methods. The rest potential of specimen in the soil increase (CTToC, the potential attain -0,53 V/Cu, CuSO4 after 2300 second testing for TTU-V specimen. The density current value of CTT and TTCU specimen is about 10-6 A/cm2 to meet requirements for using inert anode in cathodic protection by impressed current. The density current increase about ten times for TTU-V and TTU because of there are FeVO4 forming on the TTU-V anode and Fe2O3 on TTU anode. The result of impedance measure shown that the Rct resistance relatively accord with Rp resistance obtains by polarization potential method.