Multi-ion kinetics in pseudo-concrete electrolyte associated with macro-cell corrosion
Multi-ion kinetics in pseudo-concrete electrolyte associated with macro-cell corrosion
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DOI：
10.1016/j.cemconcomp.2022.104690
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发表时间：
2022-07
影响因子：
10.5
通讯作者：
Zhao Wang;K. Maekawa;H. Takeda;F. Gong
中科院分区：
文献类型：
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作者：
Zhao Wang;K. Maekawa;H. Takeda;F. Gong
钢材腐蚀是结构混凝土的破坏因素之一，在过去几十年中引起了工程界的关注。宏电池腐蚀是钢筋腐蚀的一种类型，它不仅与电场有关，而且与极化金属和电解质（如混凝土基体）中的化学物质有关。为了研究这种多离子动力学引起的宏细胞电路，本研究提出了一种实验验证，建立一个数值模拟平台，使用伪混凝土，物种的化学-电学轮廓随时间的推移进行动态测量，以获得证据的宽带验证和确认。作为胶结材料的一个关键物种，作者重点研究了Ca 2+浓度的分布，作为一个主要的阳离子的混凝土周围的正，负电极，这是显着影响的初始饱和度的氢氧化钙和二氧化碳的供应。实验和数值模拟结果表明，基于极化理论和能斯特-普朗克理论的多离子质量方程，可以较好地揭示混凝土中离子迁移的控制机理。
Steel corrosion is one of the damaging factors for structural concrete and has drawn engineering interest in the past decades. Macro-cell corrosion, a type of steel corrosion, is related to not only electric fields but also chemical substances of both polarized metals and electrolytes such as the concrete matrix. To investigate such multi-ion kinetics induced by macro-cell circuits, this study presents an experimental validation to build a numerical simulation platform using pseudo-concrete with which the species’ chemo-electrical profiles are dynamically measured with elapsed time to obtain evidence for broad-band verification and validation. As a key species of cementing material, the authors focus on the profiles of Ca2+concentrations as a major cation of concrete around the positive and negative electrodes, which are significantly affected by the initial saturation of calcium hydroxide and the supply of carbon dioxide. Experiments and numerical simulation applied to concrete show satisfactory correlation to reveal the governing mechanism based on polarization and the Nernst-Plank theory with multi-ion mass equation.