Influence of SO^2-₄ Content on Corrosion Behavior of X70 Steel in Yellow Pebble Soil

Influence of SO2-4 content on corrosion behavior of X70 steel in yellow pebble soil was studied by means of polarization curves,EIS and SEM.The results showed that with the increase of SO2-4 content,Ecorr shifted negatively and icorr increased.The Nyquist diagram was composed of two capacitive arcs.The radius of the arc became smaller with the increase of SO2-4 content.X70 steel in soil with 0.5% SO2-4 suffered severe pitting corrosion.