In the marine environment, reinforced concrete will suffer from chloride ion erosion and sulfate ion erosion at the same time. However, most scholars only study the interaction mechanism between chloride ion and sulfate ion, and the consideration of physical adsorption and chemical combination caused by hydration products is not perfect. Based on the law of conservation of mass, this study integrates the relationship between porosity and hydration time, the weakening of chemical binding of sulfate ions to chloride ions into the mathematical model, establishes the coupling transport model of sulfate and chloride, and verifies the rationality of the model by comparing with the measured data. And then, the physical adsorption and chemical binding of chloride ions under the action of sulfate ions were quantitatively analyzed. It is found that chemical binding is dominant and sulfate ion will reduce the chemical binding effect of chloride ion. With the decrease of the initial water/cement ratio, the diffusion depth of free chloride ion will also decrease.

在海洋环境中，钢筋混凝土将同时遭受氯离子侵蚀和硫酸根离子侵蚀。但是，大多数学者仅研究氯离子与硫酸根离子的相互作用机理，对水合产物引起的物理吸附和化学结合的考虑还不完善。基于质量守恒定律，本研究将孔隙度与水化时间之间的关系，弱化硫酸根离子与氯离子的化学键结合起来，建立了数学模型，建立了硫酸根与氯离子的耦合迁移模型，验证了其合理性。通过与实测数据进行比较来确定模型 然后，定量分析了在硫酸根离子作用下氯离子的物理吸附和化学结合。发现化学键占主导，硫酸根离子将降低氯离子的化学键合效果。随着初始水/水泥比的降低，游离氯离子的扩散深度也将降低。