Research on the corrosion behavior of underground cables influenced by different ions

Abstract

Anchor cable support is crucial for controlling surrounding rock in underground coal mines and space engineering. Corrosion from mine water in high-stress environments degrades the mechanical properties of anchor cables, leading to frequent failures and significant risks to surrounding rock stability. Therefore, studying the impact of corrosion on anchor cable performance is essential. This study designed an efficient, convenient accelerated corrosion test device for anchor cables. Corrosion experiments investigated the corrosion behavior and mechanical performance degradation of anchor cables influenced by major ions in weak alkaline mine water. The results showed that the main corrosion products of anchor cables were α-FeO(OH) and Fe₃O₄. Ca²⁺ and Mg²⁺ showed lower sensitivity to corrosion and were more likely to produce Fe₃O₄, with corrosion mainly consisting of spots and pits. The tensile fracture showed ductile characteristics with significant plastic deformation, a 45.72 % reduction in cross-sectional area, and relatively minor mechanical performance degradation after corrosion. In contrast, anions like Cl⁻ showed higher corrosion sensitivity, producing α-FeO(OH) with large corrosion pits. The tensile fracture was closer to brittle, with less plastic deformation and a cross-sectional area reduction of 16.52 % to 22.03 %, resulting in greater mechanical performance degradation.