Simulation Evaluation of DC Interference Current Corrosion Based on Outflowing Current Density in Different Soil

An indoor simulation equipment for DC interference corrosion was established to evaluate the relationship among outflowing current density, soil types and corrosion behavior of 16MnR steel. The influence of testing mode for that equipment was also investigated. The results show that: (1) the mode of "constant current cathodic protection & constant DC current interference" was the best operating mode of the indoor simulation equipment; (2) the corrosion behavior of DC stray interference was dominated by the DC interference intensity, while the influence of soil which hardens performance on corrosion behavior was significant; and (3) the corrosion rate was proportional to the outflowing DC current density of specimen, but the characteristics of localized corrosion was more obvious with the increase of the corrosivity of soil.