Erosion Mechanism Research Articles

Numerical analysis of gas-liquid-solid erosion characteristics of the oil and gas multiphase pump

In the process of oil and natural gas production, solid particle erosion is an important reason affecting the safe operation of oil and gas multiphase pumps. To reduce equipment failure rates, it is urgent to predict positions that are vulnerable to erosion damage. However, the erosion regularities of oil and gas multiphase pumps have rarely been studied in the past. In this paper, the Euler-Lagrange method is used to analyze the gas-liquid-solid flow phenomena in oil and gas multiphase pumps under different operating conditions, combined with the Oka model for erosion prediction. The validity of the erosion prediction method is verified using numerical simulation results of erosion at 90° elbows. To explore the erosion mechanism between fluid and entrained particle flow behavior, the relationship between particle parameters and erosion position and regularities is emphatically studied. The research results indicate that in a certain range, the maximum erosion rate of the oil and gas multiphase pump decreases with the increase of particle density, but increases linearly with the fluid velocity and is also affected by gas volume fraction and other particle parameters. In addition, the erosion usually occurs on the inlet, outlet wall, and the leading edge of the pump chamber, due to the different particle parameters, the erosion range will be slightly different. According to the particle trajectory, it is found that the leading edge of the pump chamber is the most erodible region due to the high frequency and intensity of particle impact. These results provide a reference for optimizing the structural design of the oil and gas multiphase pumps and help to predict their performance against wear.

Effect of Build Orientation and Heat Treatment on Erosion Behavior of Al10SiMg Fabricated Using Laser Powder Bed Fusion

Laser Powder Bed Fusion (LPBF) is a form of additive manufacturing that can directly make metal components and has begun to be employed in a variety of industrial situations. Moreover, the erosion characteristics of SLM-produced items have been documented relatively infrequently. In the current work, the erosion behavior of a heat-treated Al-Si-10% Mg alloy generated via laser powder bed fusion (LPBF) has been investigated. The samples were printed in three directions (horizontal (0o), vertical (90o), and inclined (45o) on the build platform using the Direct Metal Laser Sintering (DMLS) system (EOS M 290) machine. Al%Si-10%Mg samples were given treatment (T5, T6). Optical and scanning electron microscopes (SEM) were used to examine the microstructure under both printed and heat-treated conditions. Energy Dispersive Spectroscopy (EDS) and X-ray Diffraction (XRD) were used to investigate the alloy's elemental composition and compound production. The erosion test was executed in each of the three orientations, plus heat-treated samples and as-printed samples. The selected input parameters were impingement angle and flow velocity. The erosion rate was examined and contrasted across orientations for printed and heat-treated conditions to establish the best orientation. The post-eroded surface was analysed using SEM, EDS, and XRD to evaluate possible erosion processes. The key findings were: T5 heat-treated samples sustain well and have the least mass loss; Horizontal (0°) oriented samples undergo less erosion compared to other orientations; T6 heat-treated samples show maximum erosion on printed samples, and hence it is not recommended. T5 heat treatment is proven to be superior in providing high erosion resistance, followed by printed and T6 heat-treatment, respectively. The heat treatment effects are more significant than the orientation effects in determining the erosion resistance of the Al10SiMg alloy. The erosion mechanisms, such as ploughing, melting, and cratering, were identified.

Layer structure formation induced by in-situ deposit surface temperature under different scanning methods during thermal spraying

Plasma spraying-physical vapor deposition (PS-PVD) and atmospheric plasma spraying (APS), as new thermal spraying process, could prepare advanced thermal barrier coatings by successive scanning deposition layer by layer. To investigate the layer structure of the coating, the transient in-situ deposit surface temperature was investigated by varying the scanning methods. Results show that, compared to unidirectional scanning method, alternating scanning method results in doubling heating duration, higher in-situ deposit temperature rising and thereby thicker well-bonded layer structure during each spray cycle for the coating deposited at the edge position of the scanning path. The erosion resistance of the coatings deposited by unidirectional scanning method is independent on deposition positions including edge position and center position. However, the erosion resistance of the coatings deposited at edge position by alternating scanning method is one time higher than those deposited by unidirectional scanning method. Finally, the erosion mechanism of layer spallation is revealed to explain the difference between different scanning methods.

Evaluation of erosion of AISI 1045 carbon steel due to non-cohesive microparticles

Erosion behavior of AISI 1045 carbon steel was investigated using slurry solutions with different viscosities (1 cP, 3 cP, and 8 cP) containing 5 wt% silica sand as erodent particles. Tests were carried out using a slurry pot apparatus with various rotational velocities and at three mounting angles (30°, 60°, and 90°). The qualitative and quantitative analysis was performed using the Taguchi design method, paint modeling, image processing, and microscopic imaging techniques. The results indicate that the erosion process in the slurry flow is significantly influenced by fluid viscosity. There is a notable decrease in erosion wear rate as fluid viscosity increases. An analysis of variance (ANOVA) test was conducted, concluding that viscosity and rotational speed are the significant factors influencing the weight loss of carbon steel. The results demonstrate that each factor has a major impact on the response; velocity (47.20 %) is the primary factor contributing to R, followed by viscosity (38.20 %). The erosive wear mechanism changed considerably with the variation in fluid viscosity and impact angles. As viscosity increases, the cutting and pitting erosion wear mechanism shift to sliding wear with the development of micro-perforation sites.

Rock surface flow accelerates rill erosion of excavated slopes in karst mining areas

Rock surface flow is the secondary distribution of precipitation and inflow on the rock surface, an essential runoff generation mode in karst areas. The effects of rock surface flow on soil erosion in karst regions cannot be ignored. However, its impact on rill erosion in karst slopes remains unclear. The objectives of this study were to investigate the impact of rock surface flow on rill erosion, rill morphological characteristics, rill flow hydraulic characteristics, and hydrodynamic mechanisms. A field runoff plot (3 m long, 1 m wide and 0.3 m deep) with three inflow rates (2, 3, and 4 L/min) was subjected to runoff simulation experiments under two typical rock surface morphologies in karst areas: smooth rock surface (SRS) and karren rock surface (KRS), with bare slope (BS) as the control group. The results revealed that rock surface flow aggravated the soil and water loss of the excavated slope. Compared to BS, the runoff yield for SRS and KRS increased by 81.49 % and 61.91 %, respectively. Meanwhile, the soil loss of SRS and KRS were 2.50 times and 5.56 times greater. The rills below the rock outcrops didn’t develop into a rill network after formation, owing to the rock surface morphology. Rill depth was the best indicator of rill morphology for evaluating rill erosion on slopes below rock outcrops. The Reynolds number and Darcy–Weisbach resistance coefficient were the optimal hydraulic parameters to predict the rill erosion of the SRS and KRS, respectively. At the same time, the runoff power and flow shear stress were the best hydrodynamic parameters to describe the rill erosion mechanism of SRS and KRS. These results provide a scientific basis for further understanding the mechanism of soil erosion on karst slopes and for preventing soil erosion on karst slopes in mining areas.

Lithospheric weakening by a small-scale plume and its geodynamic implications

The process of small-scale mantle plume emplacement within the continental lithosphere influences the dynamic topography and architecture of the lithosphere-asthenosphere boundary (LAB). Furthermore, plume emplacement alters the rheology of the crust and lithospheric mantle through melt-driven, mechanical and thermal weakening. Previous studies of plume emplacement within the lithosphere have described these outcomes, albeit without considering plume-driven weakening. In this study, we quantitatively evaluated the effects of small-scale plume-driven predefined weakening of the continental lithospheric mantle and crust on dynamic topography and LAB depth changes using a series of two-dimensional numerical models. Model calculations showed that small plume-driven predefined weakening led to short-wavelength dynamic topography and LAB depth reduction through both mechanical and thermal erosion of the lithospheric mantle by the plume. An increase in the degree of weakening decreased the lithospheric strength and reduced the LAB depth, thereby transforming the short-wavelength topography from depressions to elevations as the extensional kinematics shifted to compression. Our model findings explain the topography, lithospheric strength, and LAB depth constrained from natural small-scale plume emplacement zones.

Al2O3-based hybrid composite coatings for mitigating the slurry erosion of an advanced steel in saline and non-saline environments

The present work focuses on the comparative slurry erosion performance evaluation of an advanced steel (ASME SA387) and the alumina-based hybrid coatings for such steels. The study aims to investigate the effect of coatings' properties on their erosion-corrosion behaviour to comprehend their wear performance in saline and non-saline environments. The coatings have been developed by the highly efficient high-velocity oxygen-fuel (HVOF) process. The alumina matrix is reinforced with ceria (CeO2), and hexagonal boron nitride(hBN). A detailed investigation starts with analyzing the coatings' mechanical properties at surface, subsurface and interface regions by using nanoindentation technique, followed by the slurry erosion performance evaluation. To get an in-depth understanding of the materials' performances, various metallurgical characterization techniques like X-ray diffraction (XRD), energy dispersive X-ray spectroscopy (EDS), scanning electron microscopy (SEM), and field emission transmission electron microscopy (FESEM) are used. In saline environments, all the materials eroded more when compared to those in non-saline environments. Corrosion-assisted erosion mechanism is found to be the predominant cause of the higher erosion rates in saline slurry medium. Among the coatings, splat detachment and pitting were found to be the erosive wear mechanisms at 30° and 90° slurry flow directions, respectively. However, erosion reduction of ≈ 90 % at 30° impact angle and ≈ 76 % at 90° impact angles were observed for alumina coatings with 0.8 wt% ceria, and 3 wt% hBN additions when compared to the substrate in the saline environments. The observed results were attributed to the metallurgical enhancements in the form of second phases in the coating microstructure, and the mechanical properties at the surface, subsurface, and interface regions.

Study on arc characteristics and influencing factors of cup-shaped axial magnetic field contact at different gap distances

The cup-shaped axial magnetic field (AMF) contact, integral to high-voltage vacuum interrupters, undergoes innovation by enhancing the slotting rotation angle of the cup wall. This adjustment significantly amplifies the gap magnetic field, promising breakthroughs in handling long-gap arcs within high-voltage vacuum interrupters. Comprehensive vacuum arc experiments were conducted on cup-shaped AMF contacts with varying slotting rotation angles at different gap distances. The research meticulously analysed the evolution of vacuum arc characteristics under diverse breaking currents. Scanning electron microscope (SEM) images of the cathode surface unveiled three distinctive microscopic morphologies: particle gullies, pore platforms, and particle platforms. Notably, the chromium content corresponding to these morphologies exhibited a progressive increase. Integrating the surface distribution of copper and chromium, the study proposed a plausible cathodic erosion mechanism. Extending the investigation, the research delved into the influence of the iron core, contact diameter, and slot number on vacuum arc characteristics, which expected to provide reference for the application of the cup-shaped AMF contact in high voltage vacuum interrupters.

Multi-scale analysis of seepage and erosion on collapse accumulation slope

This study focused on the slope surface of debris deposits during the Luwei Sea landslide. Through seepage erosion tests, nuclear magnetic resonance and the coupling of computational fluid dynamics with the discrete element method, the seepage erosion of four representative areas on the slope surface was systematically studied at the macroscopic, mesoscopic and microscopic levels. The results showed that the particle size distribution has a significant impact on the seepage erosion characteristics. When the ratio of soil to rock was higher, soil–rock mixture showed stronger resistance to infiltration and soil protection during seepage erosion. The applied osmotic pressure also affected seepage erosion. However, when the osmotic pressure exceeded a certain critical value, pore blockage became the main mechanism of seepage erosion. Furthermore, a vegetation-based soil stabilization method involving geotechnical reconstruction and material soil stabilization in unvegetated areas was proposed, thereby promoting vegetation growth and enhancing slope stability. Our findings provided effective measures and a strategic theoretical basis for the rehabilitation of mudslide accumulation sites.

Thermodynamic analysis of the reactions of strontium anorthite formation during the firing of thermal shock resistance ceramics based on the eutectic glasses of the SrO–Al2O3–SiO2 systems

Thermal shock resistance ceramic materials must have a high degree of sintering to ensure the required mechanical strength, erosion resistance, and resistance to high-temperature oxidation. However, the search for effective ways to achieve a high degree of sintering of ceramic materials based on the SrO–Al2O3–SiO2 system at low temperatures requires a large amount of experimental research. The aim of this work is to analyze thermodynamically the reactions of strontium-anorthite phase formation at the points of triple eutectics of the SrO–Al2O3–SiO2 system under low-temperature firing conditions. The eutectic points were selected in the region of strontium anorthite crystallization and had a temperature not exceeding 14000C. It has been established that in the case of compliance with the stoichiometric ratio, the final product of the interaction of the components of eutectic glasses S-1 and S-2 with the charging components is the strontium anorthite phase. The most probable is the formation of strontium anorthite in the interaction of eutectic glass components with Al2O32SiO2, which is a product of kaolinite dehydration (Al2O32SiO22H2O). It has been found that the compounds SrOSiO2 and 2SrOAl2O3SiO2 are most active in the interaction with the charging components in the direction of formation of the strontium anorthite phase than SiO2 tridymite. As a result, the sintering of strontium-anorthite compositions at a temperature of 9000C causes a significant increase in the content of the crystalline phase of strontium anorthite. The determined patterns allow making a reasonable choice of glass in the SrO–Al2O3–SiO2 system for the further manufacture of low-temperature strontium-anorthite ceramics.

Lake Kivu River Tributaries Physicochemical Characteristics and Status of Waters, Democratic Republic of Congo Side

Rivers often play a vital role in the transport of major natural chemicals entering through a variety of pathways, including atmospheric inputs, chemical weathering of minerals, mechanical erosion of rocks and soil particles, and soil leaching. Increased anthropogenic activities on the shoreline of Lake Kivu combined with existing land use practices may increase changes in river water quality and composition. Knowing the physico-chemical and biological contribution of each tributary of the lake is vital for the management of its biodiversity. This study aimed at determining the physico-chemical characteristics, water quality indices and identifying the polluted tributary rivers that feed Lake Kivu on the Congo side. The physicochemical characteristics were determined for each water sample following water quantity protocol for each analysis at the Malacology Laboratory of the Biology Department of Lwiro Research Center. Two pollution level indices were used to determine the level of organic pollution in watercourses. The physico-chemical characteristics of rivers vary from one river to another depending on the anthropogenic activities around the different sub-basins of these rivers. The state of the rivers presented here reveals that the majority of them are moderately polluted and others slightly polluted. No rivers were very heavily polluted or good in the Lake Kivu basin on the DR Congo side. There is a strong or moderate correlation between certain parameters and the water quality indices used in this study (LISEC and OPI). Due to increase in anthropogenic activities near watercourses, further research is needed and the combination of several complex analytical methods should be used in the future to better characterize these waters.

Evaluation of Opuntia-carrageenan superporous hydrogel (OPM-CRG SPH) as an effective biomaterial for drug release and tissue scaffold

The process of wound healing involves complex interplay of systems biology, dependent on coordination of various cell types, both intra and extracellular mechanisms, proteins, and signaling pathways. To enhance these interactions, drugs must be administered precisely and continuously, effectively regulating the intricate mechanisms involved in the body's response to injury. Controlled drug delivery systems (DDS) play a pivotal role in achieving this objective. A proficient DDS shields the wound from mechanical, oxidative, and enzymatic stress, against bacterial contamination ensuring an adequate oxygen supply while optimizing the localized and sustained delivery of drugs to target tissue. A pH-sensitive SPH was designed by blending two natural polysaccharides, Opuntia mucilage and carrageenan, using microwave irradiation and optimized according to swelling index at pH 1.2, 7.0, and 8.0 and % porosity. Optimized grade was analyzed for surface hydrophilicity-hydrophobicity using OCA. Analytical characterizations were performed using FTIR, TGA, XRD, DSC, reflecting semicrystalline behavior. Mechanical property confirmed adequate strength. In vitro drug release study with ciprofloxacin-HCL as model drug showed 97.8 % release within 10 h, fitting to the Korsmeyer-Peppas model following diffusion and erosion mechanism. In vitro antimicrobial, anti-inflammatory assays, zebrafish toxicity, and animal studies in mice with SPH concluded it as a novel biomaterial.

Arc erosion behavior and mechanism of AgZrO2 electrical contact materials

In this study, the novel AgZrO2 electrical contact materials reinforced with different ZrO2 contents were successfully fabricated by powder metallurgy. The effect of ZrO2 content on arc erosion resistance of the AgZrO2 electrical contact materials was investigated, and the electrical conductivity and hardness were measured, as well as the arc erosion mechanism was discussed as well. Furthermore, the properties of AgZrO2 electrical contact material were also evaluated as compared to AgSnO2 electrical contact material. The results show that with increase of ZrO2 content, the hardness of AgZrO2 electrical contact materials gradually increases, while the electrical conductivity gradually decrease. The good comprehensive properties can be achieved at 8 wt%ZrO2. The electrical conductivity and hardness of Ag-8 wt%ZrO2 electrical contact material are 72.8%IACS and 77.9 HV, respectively. The AgZrO2 electrical contact materials with less than 8 wt% exhibit lower arc energy and shorter arc duration, as well as outstanding arc erosion resistance. However, an excess ZrO2 content causes obvious fluctuations on arc energy and duration, thereby resulting in more severe arc erosion. As compared to the Ag-8 wt%SnO2 electrical contact material, the Ag-8 wt%ZrO2 electrical contact material presents lower stable contact resistance, less arc energy, shorter arc duration and better interfacial bonding, thus exhibiting excellent resistance to arc erosion.

Study on the mechanical performance damage in laboratory-simulated periodic salt environment for asphalt concrete

The phenomenon of sustainable salt damage caused by soluble salt solutions in salt environments has raised concerns in asphalt pavement. However, the evaluation methods for salt erosion damage in asphalt concrete are limited, and there is a lack of comprehensive analysis of the composition of asphalt concrete. In this study, asphalt concrete specimens immersed in NaCl solution were subjected to dry-wet cycles and freeze-thaw cycles to analyze the erosion mechanisms of NaCl solution on their mechanical properties. The chemical stability and microstructure of asphalt after immersion in NaCl solution, as well as the microstructure and mechanical properties of aggregates after NaCl solution immersion and dry-wet cycles, were investigated. The results showed that NaCl solution has a softening effect on asphalt, promoting the intrusion of NaCl crystalline salt into the asphalt. The salt crystallization of NaCl solution altered the surface roughness of the aggregates, resulting in a decrease in skid resistance but an improvement in compressive strength. Specifically, limestone exhibited more stable mechanical properties than basalt. Meanwhile, the NaCl solution concentration has no significant impact on the mechanical performance of asphalt concrete initially, but its domination over mechanical performance gradually increases as the salt environment's cyclic effects intensify. The mechanisms of salt damage in asphalt concrete by NaCl solution mainly involve dry-wet cycles (crystal volume expansion), freeze-thaw cycles (ice volume expansion), and asphalt softening and viscosity reduction. The findings of this study provide a basis for the durability research of asphalt pavements in salt environments.

Erosion characteristics of WCu/Ti3SiC2 electrical contact materials by arc discharge in various ambient atmospheres

Arc erosion performances of electrical contacts are vital to guarantee the stable operation of electric power systems. In this work, arc erosion performances of WCu/Ti3SiC2 materials in SF6, CO2, O2, and Ar were systematically researched. Detachment of silicon layers from Ti3SiC2 occur in the 4 atm, Ti3SiC2 plays an important role in protecting the composites. Severe splashings and cavities are found on the eroded surfaces in CO2 and O2. Based on the arc energy densities and composition changes, arc erosion mechanisms of WCu/Ti3SiC2 in various atmospheres are proposed.

Trade and economic relations between the EAEU member states and the countries of Latin America and the Caribbean at the present stage: the cases of Armenia and Kazakhstan

In the context of a changing world order, the development of regional integration processes is an important trigger for the inclusion of countries in the world economy and increasing the sustainability of national economies. Integration processes contribute to deepening of the interdependence of different countries, as well as to the expansion of the influence of world economic relations on national economic systems. At the same time, tendency towards the erosion of institutions and mechanisms of multilateral (global) trade and the formation of preferential regional and interregional trade agreements (partners in which are often not only individual countries, but also integration blocs), has become one of the characteristic features of modern international economic relations. The Eurasian Economic Union, as an international organization for regional economic integration, makes efforts to expand geographical boundaries of foreign economic ties, with the aim of developing relations with the economic integration groupings and individual countries throughout the world. With the same purpose EAEU member states pay attention to the development of relations with the region of Latin America and the Caribbean (LAC), considering regional countries as promising partners for mutually beneficial cooperation. This article is devoted to the study of trade relations between the countries of the EAEU and Latin America. Special attention is paid to the trade and economic relations of Armenia and Kazakhstan with Latin American countries. The choice of these two states is not accidental, since they are relatively active in the Latin American direction and complement the policy of the Russian Federation aimed at deepening cooperation with the LAC. The author concludes that these countries have the potential for further development of trade and economic relations, the implementation of which requires overcoming, first of all, logistical obstacles and tariff barriers.

Emergence of tip singularities in dissolution patterns.

Chemical erosion, one of the two major erosion processes along with mechanical erosion, occurs when a soluble rock-like salt, gypsum, or limestone is dissolved in contact with a water flow. The coupling between the geometry of the rocks, the mass transfer, and the flow leads to the formation of remarkable patterns, like scallop patterns in caves. We emphasize the common presence of very sharp shapes and spikes, despite the diversity of hydrodynamic conditions and the nature of the soluble materials. We explain the generic emergence of such spikes in dissolution processes by a geometrical approach. Singularities at the interface emerge as a consequence of the erosion directed in the normal direction, when the surface displays curvature variations, like those associated with a dissolution pattern. First, we demonstrate the presence of singular structures in natural interfaces shaped by dissolution. Then, we propose simple surface evolution models of increasing complexity demonstrating the emergence of spikes and allowing us to explain at long term by coarsening the formation of cellular structures. Finally, we perform a dissolution pattern experiment driven by solutal convection, and we report the emergence of a cellular pattern following well the model predictions. Although the precise prediction of dissolution shapes necessitates performing a complete hydrodynamic study, we show that the characteristic spikes which are reported ultimately for dissolution shapes are explained generically by geometrical arguments due to the surface evolution. These findings can be applied to other ablation patterns, reported for example in melting ice.

Mechanistic analysis of splash erosion on loess by single raindrop impact: Interaction of soil compaction, water content, and raindrop energy

Theoretical and experimental studies have demonstrated that splash erosion on agricultural land can affect agricultural production and the ecosystem. However, the splash erosion process mechanism of loess erosion under the effects of a single raindrop remains unclear. Therefore, this study investigates the effects of single-raindrop splash erosion on the cohesion and internal friction angle of compacted loess under multiple compaction, water contents, and single-raindrop kinetic energies. The results showed that the depth and diameter of the crater were linearly related to both the raindrop kinetic energy and the loess compaction. The variation of crater depth is always lower than the variation of crater diameter, and the effect of the amount of raindrop energy on crater splash erosion is higher than the effect of the variation of compaction on crater splash erosion. Raindrops with higher kinetic energy have higher erosiveness, and this can shorten the ponding point time. When the water content is constant, the fitting curve of cohesion and compaction is the exponential relationship. The increment of cohesion decreases with increasing water content when the water content is lower than the optimum water content (12.7%) and increases with increasing water content when the water content is higher than the optimum water content. However, the increment of internal friction angle consistently increases with increasing water content, which is not affected by the optimum water content. This study could be a reference for soil erosion control in the Loess region.

Characterization of nano-SiO2 cemented soil under the coupled effects of dry-wet cycles and chlorination

In contrast to cemented soils in terrestrial natural environments, cemented soils in littoral and marine geotechnical engineering face numerous difficulties. In coastal and marine geotechnical engineering, cemented soils are frequently degraded by ion erosion, tidal scouring, and temperature variations. Long-term marine environments present numerous challenges for cemented soil foundation projects. In marine geotechnical engineering, addressing and enhancing these degradation issues has become a crucial topic. To address this engineering problem, Nano-SiO2 is added to cement-stabilized soils to enhance their engineering performance. To investigate the mechanical effects and erosion mechanisms of Nano-SiO2 cemented soil subjected to chloride ion erosion and tidal alternation scouring, laboratory experiments, including immersion erosion tests with sodium chloride solution and dry-wet cycle tests, were designed. On specimens subjected to dry-wet cycles after chloride ion erosion at varying concentrations, unconfined compressive strength tests (UCS), X-ray diffraction (XRD) experiments, and scanning electron microscopy (SEM) were performed. The objective was to investigate the impact of chloride ions and Nano-SiO2 on the microstructure and strength of cemented soil. Adding 2.5% Nano-SiO2 can promote cement hydration reactions while preventing the entry of chloride ions into the cemented soil, thereby increasing the density and compressive strength of the cement.

The influence of polymer powder on the ion transportation and antierosion mechanism of cement mortar: From experiments to molecular dynamics simulation

As the main product of hydration reaction of common Portland cement, calcium silicate hydrate (C-S-H) gel is a porous gel system containing capillary and gel pores. These channels act as transport channels for water molecules and ions in the cement system. The diffusion of water molecules and ions through C-S-H gel channels has significant effects on the strength, shrinkage, creep, chemical and physical reactions of the cement system. Polymer can modify cement-based materials and improve their ionic permeability resistance. In this study, emulsified asphalt powder (EAP) and vinyl acetate ethylene copolymer (VAE) redispersible polymer powder was added into the Portland cement mortar as admixtures, respectively. The influence of redispersible polymer powder on the transportation and erosion mechanism of ions in cement mortar was investigated by analyzing the pore structure, compressive strength ratio, chloride ion permeability depth and micromorphological of cement mortar. The adsorption and diffusion behaviors of ions with different concentrations and water molecules were explored by molecular dynamics simulation, and the physiochemical reactions between ions and hydration products during the transport process in cement-based materials were comprehended.