Journal of Magnesium and Alloys最新文献_第10页

Elucidating the process mechanism in Mg-to-Al friction stir lap welding enhanced by ultrasonic vibration 阐明了超声振动增强mg - al搅拌摩擦搭接焊接的工艺机理

IF 15.8 1区材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING

Journal of Magnesium and Alloys

Pub Date : 2025-01-01 DOI: 10.1016/j.jma.2023.09.032

Ming Zhai, Lei Shi, ChuanSong Wu

The composite structures/components made by friction stir lap welding (FSLW) of Mg alloy sheet and Al alloy sheet are of wide application potentials in the manufacturing sector of transportation vehicles. To further improve the joint quality, the ultrasonic vibration (UV) is exerted in FSLW, and the UV enhanced FSLW (UVeFSLW) was developed for making Mg-to-Al dissimilar joints. The numerical analysis and experimental investigation were combined to study the process mechanism in Mg/Al UVeFSLW. An equation related to the temperature and strain rate was derived to calculate the grain size at different locations of the weld nugget zone, and the effect of grain size distribution on the threshold thermal stress was included, so that the prediction accuracy of flow stress was further improved. With such modified constitutive equation, the numerical simulation was conducted to compare the heat generation, temperature profiles and material flow behaviors in Mg/Al UVeFSLW/FSLW processes. It was found that the exerted UV decreased the temperature at two checking points on the tool/workpiece interface from 707/671 K in FSLW to 689/660 K in UVeFSLW, which suppressed the IMCs thickness at Mg-Al interface from 1.7 µm in FSLW to 1.1 µm in UVeFSLW. The exerted UV increased the horizontal materials flow ability, and decreased the upward flow ability, which resulted in the increase of effective sheet thickness/effective lap width from 2.01/3.70 mm in FSLW to 2.04/4.84 mm in UVeFSLW. Therefore, the ultrasonic vibration improved the tensile shear strength of Mg-to-Al lap joints by 18 %.

镁合金片材与铝合金片材搅拌摩擦搭接(FSLW)制成的复合结构/部件在交通运输车辆制造领域具有广泛的应用潜力。为了进一步提高接头质量，在FSLW中施加超声振动(UV)，开发了用于制备Mg-to-Al异种接头的UV增强FSLW (UVeFSLW)。采用数值分析和实验研究相结合的方法，对Mg/Al UVeFSLW的过程机理进行了研究。导出了与温度和应变速率相关的公式，计算焊缝熔核区不同位置的晶粒尺寸，并考虑了晶粒尺寸分布对阈值热应力的影响，从而进一步提高了流动应力的预测精度。利用修正后的本构方程，对Mg/Al UVeFSLW/FSLW工艺的产热、温度分布和材料流动行为进行了数值模拟比较。结果表明，施加的紫外使工具/工件界面上两个检查点的温度从FSLW的707/671 K降低到UVeFSLW的689/660 K，使Mg-Al界面的IMCs厚度从FSLW的1.7µm降低到UVeFSLW的1.1µm。施加的UV增加了材料的水平流动能力，降低了材料的向上流动能力，导致有效板厚/有效叠接宽度从FSLW的2.01/3.70 mm增加到UVeFSLW的2.04/4.84 mm。因此，超声波振动使Mg-to-Al搭接接头的抗拉剪切强度提高了18%。

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引用次数: 0

Tribological behaviors of AZ91D magnesium alloy under the lubrication of oil suspended synthetic magnesium silicate hydroxide nanotubes 油悬浮合成硅酸氢氧化镁纳米管润滑下 AZ91D 镁合金的摩擦学行为

IF 15.8 1区材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING

Journal of Magnesium and Alloys

Pub Date : 2025-01-01 DOI: 10.1016/j.jma.2024.01.007

Y.L. Yin , H.L. Yu , H.M. Wang , X.C. Ji , Z.Y. Song , X.Y. Zhou , M. Wei , P.J. Shi , W. Zhang , C.F. Zhao

Efficient lubrication of magnesium alloys is a highly challenging topic in the field of tribology. In this study, magnesium silicate hydroxide (MSH) nanotubes with serpentine structures were synthesized. The tribological behavior of AZ91D magnesium alloy rubbed against GCr15 steel was studied under lubricating oil with surface-modified MSH nanotubes as additives. The effects of the concentration, applied load, and reciprocating frequency on the friction and wear of the AZ91D alloy were studied using an SRV-4 sliding wear tester. Results show a decrease of 18.7–68.5% in friction coefficient, and a reduction of 19.4–54.3% in wear volume of magnesium alloy can be achieved by applying the synthetic serpentine additive under different conditions. A suspension containing 0.3 wt.% MSH was most efficient in reducing wear and friction. High frequency and medium load were more conducive to improving the tribological properties of magnesium alloys. A series of beneficial physical and chemical processes occurring at the AZ91D alloy/steel interface can be used to explain friction and wear reduction based on the characterization of the morphology, chemical composition, chemical state, microstructure, and nanomechanical properties of the worn surface. The synthetic MSH, with serpentine structure and nanotube morphology, possesses excellent adsorbability, high chemical activity, and good self-lubrication and catalytic activity. Therefore, physical polishing, tribochemical reactions, and physical-chemical depositions can occur easily on the sliding contacts. A dense tribolayer with a complex composition and composite structure was formed on the worn surface. Its high hardness, good toughness and plasticity, and prominent lubricity resulted in the improvement of friction and wear, making the synthetic MSH a promising efficient oil additive for magnesium alloys under boundary and mixed lubrication.

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引用次数: 0

A review of biodegradable biliary stents made of magnesium metals: Current progress and future trends 金属镁材料可生物降解胆道支架的研究进展及趋势

IF 15.8 1区材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING

Journal of Magnesium and Alloys

Pub Date : 2025-01-01 DOI: 10.1016/j.jma.2024.11.014

Ling Liu , Tuo En Liu , Tan To Cheung

Biliary system, which is responsible for transporting bile from the liver into the intestine, is commonly damaged by inflammation or tumors eventually causing liver failure or death. The implantation of biliary stents can effectively alleviate both benign and malignant biliary strictures, but the plastic and metal stents that are currently used cannot degrade and nearly has no beneficial biological effects, therefore their long-term service can result into inflammation, the formation of sludges and re-obstruction of bile duct. In recent years, magnesium (Mg) metal has been received increasing attention in the field of biomedical application due to its excellent biocompatibility, adequate mechanical properties, biodegradability and other advantages, such as anti-inflammatory and anti-tumor properties. The research on biliary stents made of magnesium metals (BSMM) has also made significant progress and a series of experiments in vitro and vivo has proved their possibility. However, there are still some problems holding back BSMM's clinical use, including rapid corrosion rate and potential harmful reaction. In this review, we would summarize the current research of BSMM, evaluate their clinical benefits, find the choke points, and discuss the solving method.

负责将胆汁从肝脏输送到肠道的胆道系统通常会因炎症或肿瘤而受损，最终导致肝功能衰竭或死亡。胆道支架植入术可以有效缓解良恶性胆道狭窄，但目前使用的塑料和金属支架无法降解，几乎没有有益的生物效应，长期使用可能导致炎症、污泥形成和胆道再阻塞。近年来，金属镁（Mg）由于其优异的生物相容性、良好的力学性能、生物降解性等优点，如抗炎、抗肿瘤等，在生物医学应用领域受到越来越多的关注。金属镁胆道支架（BSMM）的研究也取得了重大进展，一系列体外和体内实验证明了其可行性。然而，BSMM的临床应用仍存在一些问题，包括腐蚀速度快和潜在的有害反应。本文将对BSMM的研究现状进行总结，评价其临床疗效，找出其存在的瓶颈，并探讨解决方法。

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引用次数: 0

Highly corrosion-resistant and photocatalytic hybrid coating on AZ31 Mg alloy via plasma electrolytic oxidation with organic-inorganic integration 有机-无机结合等离子体电解氧化制备AZ31镁合金高耐蚀光催化杂化涂层

IF 15.8 1区材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING

Journal of Magnesium and Alloys

Pub Date : 2025-01-01 DOI: 10.1016/j.jma.2024.11.027

Talitha Tara Thanaa , Mohammad Aadil , Alireza Askari , Arash Fattah-alhosseini , Mohammad Alkaseem , Mosab Kaseem

This study explores the development of an organic-inorganic hybrid coating to enhance the corrosion resistance and photocatalytic properties of AZ31 Mg alloy modified by plasma electrolytic oxidation (PEO). The PEO process typically generates a porous oxide layer, which can reduce corrosion protection by allowing corrosive agents to penetrate the substrate. To address this limitation, phenopyridine (PHEN) and 2-methylimidazole (2-IMD) were incorporated into the PEO surface to form a robust organic layer on the Mg alloy. Potassium hydroxide (KOH) was used to adjust the pH, improving the interaction and solubility between the organic molecules and the PEO coating. The hybrid coating exhibited unique twig-like surface structures that contributed to forming a multifunctional coating with high corrosion resistance and superior photocatalytic activity. The PEO-PHEN-2IMD sample on the Mg alloy demonstrated exceptional corrosion resistance, with the lowest corrosion current density (I_corr) of 1.92 × 10^-10 A/cm², a high corrosion potential (E_corr), and the highest top layer resistance (R_top) of 2.57 × 10⁶ Ω·cm², indicating excellent barrier properties. Additionally, the coating achieved complete (100%) degradation of methylene blue (MB) within 30 min under visible light. Density Functional Theory (DFT) calculations provide deeper insights into the bonding mechanisms and interaction stability between PHEN, 2-IMD, and the PEO layer on the Mg alloy and MB dye. These findings confirmed the enhanced performance of the hybrid coating in both corrosion resistance and photocatalytic applications.

为了提高等离子体电解氧化（PEO）改性AZ31镁合金的耐蚀性和光催化性能，研究了一种有机-无机杂化涂层的开发。PEO工艺通常会产生多孔氧化层，这可以通过允许腐蚀剂渗透基材来降低腐蚀保护。为了解决这一限制，我们将苯吡啶（phenopyridine， PHEN）和2-甲基咪唑（2-IMD）掺入到PEO表面，在镁合金上形成坚固的有机层。采用氢氧化钾（KOH）调节pH，提高有机分子与PEO涂层的相互作用和溶解度。该杂化涂层具有独特的枝状表面结构，有助于形成具有高耐腐蚀性和优异光催化活性的多功能涂层。镁合金上peo - phen2 imd样品表现出优异的耐腐蚀性，最低腐蚀电流密度（Icorr）为1.92 × 10-¹⁰A/cm²，高腐蚀电位（Ecorr），最高顶层电阻（Rtop）为2.57 × 106 Ω·cm²，表明优异的阻隔性能。此外，该涂层在可见光下30分钟内实现了亚甲基蓝（MB）的完全（100%）降解。密度泛函理论（DFT）的计算为镁合金和MB染料上PHEN、2-IMD和PEO层之间的键合机制和相互作用稳定性提供了更深入的见解。这些发现证实了混合涂层在耐腐蚀和光催化应用方面的增强性能。

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引用次数: 0

Spatial mapping of the localized corrosion behavior of a magnesium alloy AZ31B tungsten inert gas weld

IF 15.8 1区材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING

Journal of Magnesium and Alloys

Pub Date : 2025-01-01 DOI: 10.1016/j.jma.2024.12.019

Leslie G. (Bland) Miller , Corey M. Efaw , Rebecca F. Schaller , Kari Higginbotham , Steve D. Johns , Paul H. Davis , Elton Graugnard , John R. Scully , Michael F. Hurley

Sections of a magnesium alloy, AZ31B, joined with tungsten inert gas (TIG) welding, were examined with scanning electrochemical microscopy (SECM) and scanning Kelvin probe force microscopy (SKPFM) to investigate corrosion mechanisms by correlating observed corrosion behavior with weld-affected microstructural variations. Insight into the changing nature of the galvanic couples between weld zones and at localized microgalvanic sites were investigated using SECM and SKPFM to map both electrochemically active regions and Volta potential differences across the weld-affected zones. The formation of an Al-Zn solidification network in the fusion zone (FZ) at and near the TIG weld epicenter differs from the outer heat-affected zone (HAZ), where intermetallic particles (IMPs) are the notable secondary phase from the magnesium matrix. These microstructures were mapped with SKPFM before and after brief exposure to a salt solution, revealing micro-galvanic couples as the main driving force to corrosion initiation and propagation within each zone. The IMPs and Al-Zn solidification network act as strong cathodes and govern the corrosion processes. The galvanic coupling and evolution of the intrinsic corrosion behavior between the weld zones is explained by monitoring the hydrogen evolution reaction (HER) with SECM over time. Anodically induced cathodic activation is confirmed for this welded material, as micro-galvanic couples between microstructural features are found to transition over time to broad electrochemically active areas within the weld-affected zones, resulting in polarity reversal as time of exposure proceeds.

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引用次数: 0

Enhancing the creep resistance in a RE-free cast Mg-Al-Ca alloy through microalloying of Ti 通过钛微合金化增强无 RE 铸造镁铝钙合金的抗蠕变性

IF 15.8 1区材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING

Journal of Magnesium and Alloys

Pub Date : 2025-01-01 DOI: 10.1016/j.jma.2024.03.015

Zhuang Cui , Yang Liu , Ying Zeng , Manping Liu , Xiaochun Liu , Shiwei Xu , Xuefei Chen , Qudong Wang

High temperature performance of magnesium alloys can be tailored by either grain size or precipitates in the grain interior. In this study, exceptional creep resistance was successfully acquired in a RE-free cast Mg-Al-Ca-Ti (AC51Ti) alloy. Microalloying of Ti (0.01 wt.%) has been found to be beneficial to the improvement of the tensile creep resistance in a RE-free cast Mg-5Al-0.35Mn-(1Ca) (AC51) alloy, showing a low state creep rate (SCR) of 2.70 × 10⁻⁹ s⁻¹ at 200 °C/50 MPa, which is even better than that of many reported RE-containing Mg alloys. The presence of trace Ti contributes to the substantial refinement and more uniform distribution of Al₂Ca precipitates in the matrix. At the same time, the microalloying of Ti improves the solubility of Al and Ca in the matrix. It is reasonable to believe that the microalloying of Ti induced re-organization of Al₂Ca precipitates, dissolved a larger amount of Al and Ca atoms into magnesium lattice, and increased the possibility of interaction between GB/dislocations and precipitates, which strongly correlates with the high temperature properties. The creep strengthening mechanisms primarily attributed to both second phase strengthening and solid solution strengthening were separately proposed based on the experimental investigations.

{"title":"Enhancing the creep resistance in a RE-free cast Mg-Al-Ca alloy through microalloying of Ti","authors":"Zhuang Cui , Yang Liu , Ying Zeng , Manping Liu , Xiaochun Liu , Shiwei Xu , Xuefei Chen , Qudong Wang","doi":"10.1016/j.jma.2024.03.015","DOIUrl":"10.1016/j.jma.2024.03.015","url":null,"abstract":"<div><div>High temperature performance of magnesium alloys can be tailored by either grain size or precipitates in the grain interior. In this study, exceptional creep resistance was successfully acquired in a RE-free cast Mg-Al-Ca-Ti (AC51Ti) alloy. Microalloying of Ti (0.01 wt.%) has been found to be beneficial to the improvement of the tensile creep resistance in a RE-free cast Mg-5Al-0.35Mn-(1Ca) (AC51) alloy, showing a low state creep rate (SCR) of 2.70 × 10<sup>−9</sup> <em>s</em><sup>−1</sup> at 200 °C/50 MPa, which is even better than that of many reported RE-containing Mg alloys. The presence of trace Ti contributes to the substantial refinement and more uniform distribution of Al<sub>2</sub>Ca precipitates in the matrix. At the same time, the microalloying of Ti improves the solubility of Al and Ca in the matrix. It is reasonable to believe that the microalloying of Ti induced re-organization of Al<sub>2</sub>Ca precipitates, dissolved a larger amount of Al and Ca atoms into magnesium lattice, and increased the possibility of interaction between GB/dislocations and precipitates, which strongly correlates with the high temperature properties. The creep strengthening mechanisms primarily attributed to both second phase strengthening and solid solution strengthening were separately proposed based on the experimental investigations.</div></div>","PeriodicalId":16214,"journal":{"name":"Journal of Magnesium and Alloys","volume":"13 1","pages":"Pages 414-428"},"PeriodicalIF":15.8,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140779513","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

MnS/MnO heterostructures with dual ion defects for high-performance aqueous magnesium ion capacitors 用于高性能水性镁离子电容器的具有双离子缺陷的 MnS/MnO 异质结构

IF 15.8 1区材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING

Journal of Magnesium and Alloys

Pub Date : 2025-01-01 DOI: 10.1016/j.jma.2024.04.036

Minghui Liu , Mudi Li , Siwen Zhang , Yaxi Ding , Ying Sun , Jiazhuo Li , Haixi Gu , Bosi Yin , Hui Li , Tianyi Ma

The advancement of aqueous magnesium ion energy storage devices encounters limitations due to the substantial hydration radius of magnesium ions (Mg²⁺) and their strong electrostatic interaction with the primary material. Consequently, this study successfully developed a MnS/MnO heterostructure through a straightforward hydrothermal and annealing method, marking its initial application in aqueous magnesium ion capacitors (AMICs). The fabricated MnS/MnO heterostructure, characterized by S defects, also generates Mn defects via in-situ initiation of early electrochemical processes. This unique dual ion defects MnS/MnO heterostructure (DID-MnS/MnO) enables the transformation of MnS and MnO, initially not highly active electrochemically for Mg²⁺, into cathode materials exhibiting high electrochemical activity and superior performance. Moreover, DID-MnS/MnO enhances conductivity, improves the kinetics of surface redox reactions, and increases the diffusion rate of Mg²⁺. Furthermore, this study introduces a dual energy storage mechanism for DID-MnS/MnO, which, in conjunction with dual ion defects, offers additional active sites for Mg²⁺ insertion/deinsertion in the host material, mitigating volume expansion and structural degradation during repeated charge-discharge cycles, thereby significantly enhancing cycling reversibility. As anticipated, using a three-electrode system, the developed DID-MnS/MnO demonstrated a discharge specific capacity of 237.9 mAh/g at a current density of 0.1 A/g. Remarkably, the constructed AMIC maintained a capacity retention rate of 94.3% after 10000 cycles at a current density of 1.0 A/g, with a specific capacitance of 165.7 F/g. Hence, DID-MnS/MnO offers insightful perspectives for designing alternative clean energy sources and is expected to contribute significantly to the advancement of the clean energy sector.

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引用次数: 0

Recent advances on the oxide film of ignition-proof magnesium alloys: A review 防燃镁合金氧化膜的最新进展：综述

IF 15.8 1区材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING

Journal of Magnesium and Alloys

Pub Date : 2025-01-01 DOI: 10.1016/j.jma.2024.05.018

Jiaxuan Han, Bo Hu, Zhenfei Jiang, Fanjin Yao, Zixin Li, Dejiang Li, Xiaoqin Zeng, Wenjiang Ding

Magnesium and its alloys offer lightweight advantage and have extensive development prospects, particularly in aerospace. However, their flammability poses a significant barrier on the development of Mg alloys. The ignition resistance of these alloys often depends on the protectiveness of the oxide film formed on the surface. This paper elucidates the formation mechanism of oxide film from thermodynamics and kinetics, classifying oxide films based on their layered structure to assess their protective properties. Furthermore, it comprehensively reviews the impact of characteristics on the protective effectiveness such as compactness, continuity, thickness, and mechanical properties. The paper also introduces various characterization methods for the microstructure and properties of oxide film. The primary objective of this paper is to enhance the comprehension of oxide film concerning the ignition resistance of Mg alloys and to furnish references for future advancements and research in Mg alloys with heightened ignition resistance.

{"title":"Recent advances on the oxide film of ignition-proof magnesium alloys: A review","authors":"Jiaxuan Han, Bo Hu, Zhenfei Jiang, Fanjin Yao, Zixin Li, Dejiang Li, Xiaoqin Zeng, Wenjiang Ding","doi":"10.1016/j.jma.2024.05.018","DOIUrl":"10.1016/j.jma.2024.05.018","url":null,"abstract":"<div><div>Magnesium and its alloys offer lightweight advantage and have extensive development prospects, particularly in aerospace. However, their flammability poses a significant barrier on the development of Mg alloys. The ignition resistance of these alloys often depends on the protectiveness of the oxide film formed on the surface. This paper elucidates the formation mechanism of oxide film from thermodynamics and kinetics, classifying oxide films based on their layered structure to assess their protective properties. Furthermore, it comprehensively reviews the impact of characteristics on the protective effectiveness such as compactness, continuity, thickness, and mechanical properties. The paper also introduces various characterization methods for the microstructure and properties of oxide film. The primary objective of this paper is to enhance the comprehension of oxide film concerning the ignition resistance of Mg alloys and to furnish references for future advancements and research in Mg alloys with heightened ignition resistance.</div></div>","PeriodicalId":16214,"journal":{"name":"Journal of Magnesium and Alloys","volume":"13 1","pages":"Pages 4-29"},"PeriodicalIF":15.8,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141399342","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Optimization of corrosion resistance of AZ31 Mg alloy through hydration-driven interaction between quinolin-8-ol and plasma electrolytic oxidation-formed MgO layer 通过喹啉-8-醇与等离子电解氧化形成的氧化镁层之间的水合作用优化 AZ31 镁合金的耐腐蚀性能

IF 15.8 1区材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING

Journal of Magnesium and Alloys

Pub Date : 2025-01-01 DOI: 10.1016/j.jma.2024.12.023

Mosab Kaseem , Talitha Tara Thanaa , Ananda Repycha Safira , Alireza Askari , Arash Fattah-alhosseini

This study presents a novel approach to improving the anticorrosive performance of AZ31 Mg alloy by exploiting the role of the hydration reaction to induce interactions between Quinolin-8-ol (8HQ) molecules and the porous MgO layer formed via plasma electrolytic oxidation (PEO). The AZ31 Mg alloy, initially coated with a PEO layer, underwent a dipping treatment in an ethanolic solution of 0.05 M 8HQ at 50 °C for 3 h. The results were compared with those from a different procedure where the PEO layer was subjected to a hydration reaction for 2 h at 90 °C before immersion in the 8HQ solution under the same conditions. The hydration treatment played a crucial role by converting MgO to Mg(OH)₂, significantly enhancing the surface reactivity. This transformation introduced hydroxyl groups (−OH) on the surface, which facilitated donor-acceptor interactions with the electron-accepting sites on 8HQ molecules. The calculated binding energy (E_binding) from DFT indicated that the interaction energy of 8HQ with Mg(OH)₂ was lower compared to 8HQ with MgO, suggesting easier adsorption of 8HQ molecules on the hydrated surface. This, combined with the increased number of active sites and enhanced surface area, allowed for extensive surface coverage by 8HQ, leading to the formation of a stable, flake-like protective layer that sealed the majority of pores on the PEO layer. DFT calculations further suggested that the hydration treatment provided multiple active sites, enabling effective contact with 8HQ and rapid electron transfer, creating ideal conditions for charge-transfer-induced physical and chemical bonding. This study shows that hydration and 8HQ treatments significantly enhance the corrosion resistance of Mg alloys, highlighting their potential for advanced anticorrosive coatings.

本研究提出了一种提高 AZ31 Mg 合金防腐性能的新方法，即利用水化反应诱导喹啉-8-醇（8HQ）分子与通过等离子电解氧化（PEO）形成的多孔氧化镁层之间的相互作用。AZ31 Mg 合金最初涂有 PEO 层，在 50 °C、0.05 M 8HQ 的乙醇溶液中浸渍 3 小时。水化处理通过将氧化镁转化为 Mg(OH)₂发挥了关键作用，显著提高了表面活性。这种转化在表面引入了羟基（-OH），从而促进了供体与 8HQ 分子上的电子接受位点之间的相互作用。DFT 计算得出的结合能（Ebinding）表明，8HQ 与 Mg(OH)₂ 的相互作用能低于 8HQ 与 MgO 的相互作用能，这表明 8HQ 分子更容易吸附在水合表面上。再加上活性位点数量的增加和表面积的增大，使得 8HQ 的表面覆盖范围更广，从而形成了稳定的片状保护层，封住了 PEO 层上的大部分孔隙。DFT 计算进一步表明，水合处理提供了多个活性位点，使其能够与 8HQ 有效接触并快速进行电子转移，为电荷转移引起的物理和化学键合创造了理想条件。这项研究表明，水合和 8HQ 处理可显著提高镁合金的耐腐蚀性，从而凸显了它们作为先进防腐涂层的潜力。

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引用次数: 0

Deep removal impurities in the process of preparing high-purity magnesium by vacuum gasification 真空气化法制备高纯镁过程中杂质的深度去除

IF 17.6 1区材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING

Journal of Magnesium and Alloys

Pub Date : 2024-12-30 DOI: 10.1016/j.jma.2024.11.010

Dong Liang, Lipeng Wang, Tingzhuang Ma, Rong Yu, Yang Tian, Baoqiang Xu, Bin Yang

Magnesium (Mg), as one of the most abundant elements in earth's crust, is the lightest structural metal with extensive applications across various industries. However, the performance of Mg-based products is highly dependent on their impurity levels, and the lack of high-purity Mg, along with efficient purification method, has posed significant challenge to its widespread industrial adoption. This study investigates the impurity behavior in Mg ingots during the vacuum gasification purification process. Through the analysis of binary phase diagrams, iron (Fe)-based foam material was selected for the filtration and purification of Mg vapor in a vacuum tube furnace. A novel approach combining vacuum gasification, vapor purification, and directional condensation is proposed. The effect of filter pore sizes and filtration temperatures on the efficacy of impurity removal was evaluated. Experimental results demonstrate that Fe-based foam with a pore size of 60 ppi, at a filtration temperature of 773 K, effectively removes impurities such as calcium (Ca), potassium (K), sodium (Na), manganese (Mn), silicon (Si), aluminum (Al), and various oxides, sulfides, and chlorides from the vapor phase. Consequently, high-purity Mg with a purity level exceeding 5N3 was obtained in the condensation zone.

镁（Mg）是地壳中含量最丰富的元素之一，是最轻的结构金属，广泛应用于各个工业领域。然而，镁基产品的性能高度依赖于其杂质水平，缺乏高纯度的镁，以及有效的纯化方法，对其广泛的工业应用构成了重大挑战。研究了真空气化净化过程中镁锭中的杂质行为。通过对二元相图的分析，选择了铁基泡沫材料在真空管炉中对Mg蒸气进行过滤净化。提出了一种真空气化、蒸汽净化和定向冷凝相结合的新方法。考察了过滤孔径和过滤温度对除杂效果的影响。实验结果表明，孔径为60 ppi的铁基泡沫在773 K的过滤温度下，可以有效地去除气相中的钙（Ca）、钾(K)、钠（Na）、锰（Mn）、硅（Si）、铝（Al）等杂质以及各种氧化物、硫化物和氯化物。从而在缩合区获得了纯度超过5N3的高纯Mg。

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引用次数: 0