Corrosion Behavior of Rockbolts in Simulated Underground Mining Solutions Using Macro-scale and Micro-scale Electrochemical Measurements

This paper focused on the corrosion of rockbolts with different S contents and yield strengths in simulated underground mining solutions using macro-electrochemical and micro-electrochemical measurements. The effect of Cl- ion on the pitting behavior was also investigated. It was found that the increase in Cl- concentration decreased the corrosion potential and corrosion current of anode polarization. The MnS inclusion was found to be the preferred site for corrosion. Based on in-situ observation and SEM characterization, it was found that the corrosion process started with the formation of corrosion trenches around the MnS, which accelerated the dissolution of the surrounding matrix.