College of Energy, Xi'an University of Science and Technology, Xi'an, China.
College of Intelligent Manufacturing and Information Engineering, Shaanxi Energy Institute, Xianyang, China.
PLoS One. 2024 Sep 4;19(9):e0309544. doi: 10.1371/journal.pone.0309544. eCollection 2024.
This study examines the corrosion characteristics of weakly cemented sandstone under alkaline conditions, evaluating the effects of varying pH levels on its macroscopic degradation, micro-porosity, and mechanical properties, notably uniaxial compressive strength. Findings reveal that heightened alkalinity exacerbates rock damage, although a temporary alleviation in mass loss occurs between pH 9 and 11 due to pore clogging by complexes formed from cations like Ca2+ and Mg2+.Increased alkalinity induces marked changes in pore features, with an observed rise in pore numbers, transformation of pore shapes from elongated to more spherical, and adjustments in porosity, pore size, and roundness. Furthermore, the study confirms a decline in both the rock's compressive strength and elastic modulus as pH rises. These revelations shed light on the role of pH in the corrosion behavior of weakly cemented sandstone under alkaline conditions, providing a fresh perspective for understanding its corrosion mechanisms in such environments.
本研究考察了碱性条件下弱胶结砂岩的腐蚀特性，评估了不同 pH 值水平对其宏观降解、微孔结构和机械性能（特别是单轴抗压强度）的影响。研究结果表明，高碱性会加剧岩石损伤，但由于 Ca2+ 和 Mg2+ 等阳离子形成的络合物堵塞了孔隙，在 pH 值为 9 到 11 之间，质量损失会暂时减轻。高碱性会导致孔隙特征发生明显变化，孔隙数量增加，孔隙形状从细长变为更球形，孔隙率、孔径和圆度也会发生调整。此外，研究还证实随着 pH 值的升高，岩石的抗压强度和弹性模量都有所下降。这些发现揭示了 pH 值在碱性条件下弱胶结砂岩腐蚀行为中的作用，为理解其在这种环境中的腐蚀机制提供了新的视角。
