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 R_ct resistance relatively accord with Rp resistance obtains by polarization potential method.