Experimental study of dynamic DC stray current corrosion of X70 steel

Abstract

In this paper, an experimental investigation on X70 steel was performed with respect to dynamic DC stray current interference in a soil-simulated solution and in quartz sand. The results showed that the interference period had a huge impact on the corrosion rate. When the interference period was less than 100 s, corrosion rates in the two testing conditions were less than 12% of that induced by steady DC corrosion with an equivalent current. When the interference period was longer than 100 s, the corrosion rate in the soilsimulated solution increased more significantly than that in quartz sand. Also, when the interference period was longer than 1 h, the corrosion rate in the soil-simulated solution was approximately equal to the Faraday theory corrosion rate. However, the corrosion rate in quartz sand was still less than 81% of the Faraday theory corrosion rate, even though the interference period had been increased to 16 h. The difference of the corrosion rates in the two testing conditions was probably because of the different capacities of charge consumption by the capacitance effect of the electric double layer as well as the different charge consumption due to the extra reaction of species other than iron.

Influence of Stray Current on Fastening System Components in Urban Railway Tracks

“…Currently, most studies [20][21][22][23][24][25] focus on stray current corrosion in pipelines or on stray current simulations and modeling [7,16,26,27]. The main objectives of some conducted studies are listed in Table 1.…”