Abstract
In the extraction of shale gas, Cl(-) and S(2)O(3)(2-) are one of the important factors causing severe corrosion and failure of equipment and pipelines. Addressing the Cl(-)/S(2)O(3)(2-) corrosion challenge in shale gas exploitation pipeline steels, this study evaluates the corrosion rates of L245 steels under diverse conditions, including S(2)O(3)(2-) concentration and exposure time, utilizing the weight loss method. The microstructural, elemental, and phase compositions of the corrosion products were examined, and the electrochemical behavior of L245 steel was scrutinized under various conditions. Findings indicate that S(2)O(3)(2-) addition intensifies localized corrosion on L245 steel, with the corrosion nature being contingent upon S(2)O(3)(2-) concentration in the Cl(-)-containing solution. Concurrently, an escalation in S(2)O(3)(2-) concentration correlates with a reduction in capacitive arc diameter and a significant decrease in film resistance, culminating in an accelerated corrosion rate.