Electrochemical corrosion and impedance study of SAE1045 steel under gel-like environment

Abstract To present simulative study on corrosion of metal by sewage sludge, three kinds of gel-like systems based on SiO 2 gel and polyacrylamide gel are proposed. Comparative results of electrochemical polarization and impedance studies together with coupon test of SAE1045 steel under these gel-like surroundings and deionized water are investigated. Obvious pitting corrosion characteristic of the steel can be seen in gel-like systems with decreasing I corr and more negative value of E corr . It is considered to be caused by electric field concentration effect at defected sites in covering layer on the surface of the steel formed by gel particles.