Short-term Corrosion Behavior of Q235 Steel and Cu with AC Interference in Beijing Soil with Different Soil Moisture Contents

The corrosion behavior of Q235 steel and Cu was studied by polarization curve and buried sample experiment in Beijing soil with different soil moisture contents for a short time. Results indicate that alternating current played an obvious role in promoting the corrosion of Q235 steel and Cu, especially for Cu. Obvious interaction was observed between the influence of alternating current and soil moisture on Q235 steel, while the effect of those on Cu was slight. In fact, alternating current had primary effect on the anodic process and soil moisture content mainly influenced the cathodic process. When the soil moisture content was unsaturated, corrosion was found on the surface of both Q235 steel and Cu, and aggravated with the increase of soil moisture content, whereas the density and depth of pitting gradually decreased. However, severe pitting appeared on the surface of Q235 and Cu when the soil moisture was saturated.