Surface & Coatings Technology最新文献_第4页

New perspectives of atmospheric pressure dielectric barrier discharges for the deposition of thin films: From uncontrolled amorphous plasma-polymer layers to chemically patterned and crystalline (in)organic coatings 常压介质阻挡放电沉积薄膜的新视角：从不受控制的无定形等离子聚合物层到化学图案和结晶（非）有机涂层

IF 5.3 2区材料科学 Q1 MATERIALS SCIENCE, COATINGS & FILMS

Surface & Coatings Technology

Pub Date : 2024-11-17 DOI: 10.1016/j.surfcoat.2024.131559

Marie Brabant , Annaelle Demaude , Jeremy Mertens , Nicolas Fosseur , Antoine Remy , Mouhamed Serigne Fall , David Petitjean , Tiriana Segato , Stephane Godet , François Reniers

For more than a century, atmospheric pressure dielectric barrier discharges (DBDs) have been utilized in industries for gas conversion and surface treatment. However, the application of DBDs for coating deposition remained limited due to challenges in controlling film quality. At atmospheric pressure, the extremely short mean free path results in species with very low energies, often causing random processes due to moving filaments.

In this paper, we show that, today, DBD technology can produce chemically well-controlled and tunable thin films using organic or inorganic precursors. Atmospheric pressure dielectric barrier discharges are either used to deposit organic or crystalline inorganic coatings, with or without chemical patterning, thanks to the immobilization of plasma filaments, evidencing the versatility of this new approach. The influence of the plasma parameters and the precursor chemistry on the composition of plasma-polymerized organic coatings is shown. More specifically, the protective effect of double bonds in the precursor structure on the chemical functionalities in the final coatings is evidenced, along with the impact on the deposition rate. In parallel, the nature of the plasma gas is shown to influence the final chemistry of the coatings, and the deposition rate. The effect of the plasma frequency on the crystal size of vanadium coatings is also shown and explained. Immobilizing filaments enables spatial chemically differentiation between organic and inorganic coatings. The local chemistry can be tuned by changing the gas gap, the monomer flow and the oxygen content (for inorganic coatings).

一个多世纪以来，常压介质阻挡放电（DBD）一直被工业界用于气体转换和表面处理。然而，由于薄膜质量控制方面的挑战，DBD 在涂层沉积方面的应用仍然有限。在大气压力下，极短的平均自由路径会产生能量极低的物质，通常会由于移动的丝状物而导致随机过程。在本文中，我们展示了如今的 DBD 技术可以使用有机或无机前驱体生产化学控制良好且可调的薄膜。由于等离子体丝的固定作用，大气压介质阻挡放电可用于沉积有机或结晶无机涂层，并可进行或不进行化学图案化，这证明了这种新方法的多功能性。等离子体参数和前驱体化学成分对等离子体聚合有机涂层成分的影响显而易见。更具体地说，证明了前驱体结构中的双键对最终涂层中化学功能性的保护作用，以及对沉积速率的影响。同时，等离子气体的性质也会影响最终涂层的化学性质和沉积速率。等离子体频率对钒镀层晶体尺寸的影响也得到了展示和解释。固定纤丝可实现有机和无机涂层之间的空间化学分化。通过改变气隙、单体流量和氧气含量（对于无机涂层），可以调整局部化学性质。

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引用次数: 0

Modified multilayered porous titanium scaffolds with silicon-doped coating surface-loaded BMP-2 prepared by microarc oxidation for bone defect repair 用微弧氧化法制备的掺硅涂层表面负载 BMP-2 的改性多层多孔钛支架用于骨缺损修复

IF 5.3 2区材料科学 Q1 MATERIALS SCIENCE, COATINGS & FILMS

Surface & Coatings Technology

Pub Date : 2024-11-16 DOI: 10.1016/j.surfcoat.2024.131570

Xue'e Zhang , Xu Zhang , Wuchao Zhou , MengZhen Tang, Tiebiao Wang, Ketong Le, Weihong Xi

As is generally known, the lack of osteoinductive properties in titanium scaffolds has been a major barrier to bone defects repair. In our previous studies, we found that silicon-doped porous coatings prepared via micro-arc oxidation (MAO) had the potential application of Si-doped coatings in dental and orthopedic fields. We are currently focused on developing more advanced surface coatings to maximize their osteoinductive efficacy. Bone morphogenetic protein-2 (BMP-2), known for its ability to induce bone and cartilage development, has also been extensively studied. Therefore, in this study, macroporous titanium alloy scaffolds were fabricated using 3D printing technology, silicon ions were introduced onto the surface of customized macroporous titanium alloy scaffolds through MAO to enhance the bioactivity of the scaffolds, and BMP-2 was loaded onto the Si-doped coating to further improve the osseointegration of the titanium alloy scaffolds post-implantation. Results demonstrated that silicon-doped coating-loaded BMP2-modified multi-level porous titanium scaffolds exhibited improved hydrophilicity and biocompatibility. In-vivo and vitro studies further confirmed the superior bone regeneration capabilities of these scaffolds. This study demonstrates an optional strategy to combine two surface modification treatments, offering substantial potential as an advanced bone defect repair material with improved and accelerated bone regeneration.

众所周知，钛支架缺乏骨诱导特性一直是骨缺损修复的主要障碍。在之前的研究中，我们发现通过微弧氧化（MAO）制备的掺硅多孔涂层具有在牙科和骨科领域应用的潜力。目前，我们正致力于开发更先进的表面涂层，以最大限度地提高其骨诱导功效。骨形态发生蛋白-2（BMP-2）以其诱导骨和软骨发育的能力而闻名，也已被广泛研究。因此，本研究利用三维打印技术制作了大孔钛合金支架，通过 MAO 在定制的大孔钛合金支架表面引入硅离子以增强支架的生物活性，并在掺硅涂层上负载 BMP-2 以进一步改善钛合金支架植入后的骨结合。结果表明，掺硅涂层负载的 BMP2 改性多层次多孔钛合金支架具有更好的亲水性和生物相容性。体内和体外研究进一步证实了这些支架卓越的骨再生能力。这项研究展示了一种将两种表面改性处理方法相结合的可选策略，作为一种先进的骨缺损修复材料，它具有改善和加速骨再生的巨大潜力。

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引用次数: 0

Surface modification of titanium alloy using a novel elastic abrasive jet machining method 使用新型弹性磨料喷射加工方法对钛合金进行表面改性

IF 5.3 2区材料科学 Q1 MATERIALS SCIENCE, COATINGS & FILMS

Surface & Coatings Technology

Pub Date : 2024-11-16 DOI: 10.1016/j.surfcoat.2024.131573

Kejia Zhuang , Ying Li , Jian Weng , Zhizheng Wu , Shuqiang Li , Zhonghua Li , Li Ma

Surface modification is always employed to enhance surface integrity, where abrasive jet machining (AJM) represents a large portion. This paper investigates the impact of a new elastic abrasive jet machining (EAJM) method on the surface characteristics of Ti6Al4V alloy. A self-developed multi-element polymer microbead covered by diamond powders is employed as the abrasive with a hardness of approximately 50–80 HV. This study systematically examines and compares the performance of elastic and hard abrasives in surface modification of Ti6Al4V by AJM, investigating the effects of nozzle pressure (P) and traverse speed (v) on surface integrity. The lowest surface roughness and highest microhardness are achieved by EAJM under the condition of P = 350 kPa and v = 0.75 mm/s. Hard abrasive jet machining (HAJM) tends to produce poor surface quality when excessive parameters are applied, while the performance of EAJM is relatively stable. The most compressive residual stresses obtained by EAJM and HAJM are −300 and −140 MPa, respectively. EAJM is able to modify the surface characteristics and produce a better surface quality with a lower material removal amount compared to HAJM. In addition, the relatively lower crushing rate of the elastic matrix and the fact that the material removal capability of EAJM relies on the diamond powders on the abrasive surface make it easier for EAJM to maintain its performance.

为了提高表面的完整性，人们总是采用表面改性的方法，其中喷射磨料加工（AJM）占了很大一部分。本文研究了一种新型弹性磨料喷射加工（EAJM）方法对 Ti6Al4V 合金表面特性的影响。磨料采用了自主研发的多元素聚合物微珠，表面覆盖金刚石粉末，硬度约为 50-80 HV。本研究系统地考察和比较了弹性磨料和硬磨料在 AJM 对 Ti6Al4V 进行表面改性时的性能，研究了喷嘴压力（P）和横移速度（v）对表面完整性的影响。在 P = 350 kPa 和 v = 0.75 mm/s 条件下，EAJM 的表面粗糙度最低，显微硬度最高。硬质磨料喷射加工（HAJM）在应用过多参数时往往会产生较差的表面质量，而 EAJM 的性能则相对稳定。EAJM 和 HAJM 获得的最大压缩残余应力分别为 -300 和 -140 兆帕。与 HAJM 相比，EAJM 能够改变表面特性，并以较低的材料去除量获得更好的表面质量。此外，弹性基体的破碎率相对较低，而且 EAJM 的材料去除能力依赖于磨料表面的金刚石粉末，这使得 EAJM 更容易保持其性能。

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引用次数: 0

Modelling multivariate coating thickness distribution in plasma spraying considering asymmetrical spatial distribution of powder 考虑粉末的非对称空间分布，模拟等离子喷涂中的多变量涂层厚度分布

IF 5.3 2区材料科学 Q1 MATERIALS SCIENCE, COATINGS & FILMS

Surface & Coatings Technology

Pub Date : 2024-11-16 DOI: 10.1016/j.surfcoat.2024.131566

Yimeng Yao , Deping Yu , Qinpeng Li , Kun Liu , Keming Peng , Chao Zhang , Yiwen Chen , Dingjun Li

Plasma spraying is a critical surface coating technique extensively used across various industries to improve the surface characteristics of workpiece. Accurate modelling of the coating thickness distribution is vital for trajectory planning and optimizing process parameters in the robotic plasma spray system. Traditional models for coating thickness distribution often assume a Gaussian powder distribution in the nozzle's external space. However, this assumption is frequently inaccurate, as the spatial distribution of powder in radial powder-feeding plasma spraying is typically asymmetrical rather than Gaussian, limiting the applicability of these models in real-world operations. To overcome this limitation and improve the prediction accuracy, this paper proposes a novel multivariate model for coating thickness distribution that considers the asymmetrical spatial distribution of powder. The model incorporates variables such as plasma spray torch speed, spray angle, and spray distance, allowing for the prediction of coating thickness under diverse powder feeding scenarios. To validate the model's effectiveness, plasma spraying experiments involving spot and linear spraying were conducted under various parameters. Then the corresponding coating thickness prediction using our proposed model was compared against that using a conventional bimodal Gaussian model. The comparative analysis demonstrated that our model offers superior fitting accuracy and reduced error margins, thereby validating its reliability.

等离子喷涂是一种关键的表面涂层技术，广泛应用于各行各业，以改善工件的表面特性。涂层厚度分布的精确建模对于机器人等离子喷涂系统的轨迹规划和工艺参数优化至关重要。传统的涂层厚度分布模型通常假设喷嘴外部空间的粉末分布为高斯分布。然而，这种假设经常是不准确的，因为在径向送粉等离子喷涂中，粉末的空间分布通常是不对称的，而不是高斯分布，从而限制了这些模型在实际操作中的适用性。为了克服这一局限性并提高预测精度，本文提出了一种考虑到粉末非对称空间分布的新型涂层厚度分布多元模型。该模型结合了等离子喷枪速度、喷射角度和喷射距离等变量，可在不同的粉末进料情况下预测涂层厚度。为了验证模型的有效性，我们在不同参数下进行了等离子喷涂实验，包括点喷涂和线性喷涂。然后将使用我们提出的模型预测的相应涂层厚度与使用传统双峰高斯模型预测的涂层厚度进行了比较。对比分析表明，我们的模型具有更高的拟合精度和更小的误差范围，从而验证了其可靠性。

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引用次数: 0

Surface strengthening mechanisms of laser shock peening additive manufacturing CuSn alloys: Experimental and numerical simulation investigations 激光冲击强化增材制造 CuSn 合金的表面强化机制：实验和数值模拟研究

IF 5.3 2区材料科学 Q1 MATERIALS SCIENCE, COATINGS & FILMS

Surface & Coatings Technology

Pub Date : 2024-11-16 DOI: 10.1016/j.surfcoat.2024.131567

Wenmin Tang , Siyu Li , Yongming Huang , Hua Ming , Xianhuan Wang , Likun Li , Xuanguo Wang , Zhiyuan Liu

Laser shock peening (LSP) is a widely used in the post-additive manufacturing industry for inducing compressive residual stress (CRS) and healing defects. Compared to traditional surface strengthening techniques, LSP provides the advantages of high machining precision and flexibility, achieving surface strengthening with minimal surface damage. This study conducted a series of LSP experiments on the additively manufactured CuSn alloy with varying single pulse energy, which achieving defects healing and introducing CRS into surface. The experimental results confirm that the surface microstructure forms a finely-distributed layer within a uniform distribution after LSP. The surface hardness increased from 134(± 2.5) HV to 222(± 3.3) HV at maximum, and the CRS of −316 (± 85) MPa was introduced into the surface of sample. Moreover, after LSP treatment, the porosity was reduced from 5.4(± 1.5) % to 1.3(± 0.4) %, the surface corrosion resistance improved approximately 6.6-fold. Importantly, we propose a more accurate finite element model (FEM) for the spatial-temporal distribution of shock pressure and analyze the residual stress distribution caused by different laser energies. The experimental and FEM results have better agreement, which confirms the reasonability of the method. The method provides a theoretical approach for the fields related to laser processing such as laser forming and laser-induced surface structure.

激光冲击强化（LSP）被广泛应用于后添加制造业，用于诱导压缩残余应力（CRS）和修复缺陷。与传统的表面强化技术相比，LSP 具有加工精度高、灵活性强等优点，可在实现表面强化的同时将表面损伤降至最低。本研究对快速成型的 CuSn 合金进行了一系列 LSP 实验，通过改变单脉冲能量，实现了缺陷愈合并在表面引入了 CRS。实验结果证实，LSP 后，表面微观结构形成了均匀分布的细小分布层。表面硬度从 134(± 2.5) HV 增加到最大值 222(± 3.3) HV，并在样品表面引入了 -316 (± 85) MPa 的 CRS。此外，经过 LSP 处理后，孔隙率从 5.4(± 1.5) % 降至 1.3(± 0.4) %，表面耐腐蚀性提高了约 6.6 倍。重要的是，我们提出了一种更精确的冲击压力时空分布有限元模型（FEM），并分析了不同激光能量引起的残余应力分布。实验结果和有限元模型结果具有较好的一致性，这证实了该方法的合理性。该方法为激光成型和激光诱导表面结构等激光加工相关领域提供了理论方法。

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引用次数: 0

Multi-functional superhydrophobic coatings on MgLi alloys via SiO2 nano particles assembled surface modification 通过二氧化硅纳米颗粒组装表面改性在镁锂合金上形成多功能超疏水涂层

IF 5.3 2区材料科学 Q1 MATERIALS SCIENCE, COATINGS & FILMS

Surface & Coatings Technology

Pub Date : 2024-11-16 DOI: 10.1016/j.surfcoat.2024.131568

Siyuan Jin , Jie Zhou , Ruizhi Wu , Xiaochun Ma , Mengyao Pang , Zhe Yu , Guixiang Wang , Jinghuai Zhang , Boris Krit , Sergey Betsofen , Neshchimenko Vitalii , Buzikov Ruslan , Min Qiu , Yurong Yang , Jiaming Chen

A multi-structured composite coating with superhydrophobic properties, corrosion resistance, and wear resistance was prepared on the surface of Mg-9Li-3Al alloy. A porous layer was formed on the substrate surface via micro-arc oxidation. Then, LDH was grown in situ on the MAO coating surface through hydrothermal treatment, sealing the pores in the coating. Finally, HDTMS-SiO₂ was assembled on the LDH surface. The SiO₂ formed an island-like micro-nano structure, trapping air and creating an “air cushion” on the coating surface，imparting superhydrophobicity (contact angle and sliding angle of 162.1 ± 2.1° and 4.2 ± 0.2°). And the corrosion resistance of the MLS coating is significantly improved the corrosion current density decreased by three orders of magnitude. The incorporation of HDTMS-SiO₂ not only improved the corrosion resistance of the coating but also significantly enhanced its wear resistance. During friction, the SiO₂ nanoparticles acted as “ball bearings,” shifting the friction mode from sliding to rolling. The fragmented SiO₂ further served as a solid lubricant, reducing the coefficient of friction to 0.11.

在 Mg-9Li-3Al 合金表面制备了一种具有超疏水性、耐腐蚀性和耐磨性的多结构复合涂层。通过微弧氧化法在基材表面形成多孔层。然后，通过水热处理在 MAO 涂层表面原位生长 LDH，封闭涂层中的孔隙。最后，在 LDH 表面组装 HDTMS-SiO₂。SiO₂形成岛状微纳结构，截留空气并在涂层表面形成 "气垫"，赋予涂层超疏水性（接触角和滑动角分别为 162.1 ± 2.1° 和 4.2 ± 0.2°）。MLS 涂层的耐腐蚀性能也得到了显著改善，腐蚀电流密度降低了三个数量级。HDTMS-SiO₂ 的加入不仅提高了涂层的耐腐蚀性，还显著增强了其耐磨性。在摩擦过程中，SiO₂ 纳米颗粒起到了 "滚珠轴承 "的作用，将摩擦模式从滑动转变为滚动。碎裂的 SiO₂ 还可作为固体润滑剂，将摩擦系数降至 0.11。

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引用次数: 0

Boriding influence on cyclic oxidation of CrFeMnNbNi high entropy alloy 硼化对 CrFeMnNbNi 高熵合金循环氧化的影响

IF 5.3 2区材料科学 Q1 MATERIALS SCIENCE, COATINGS & FILMS

Surface & Coatings Technology

Pub Date : 2024-11-15 DOI: 10.1016/j.surfcoat.2024.131564

Kadir Mert Döleker , Ali Günen , Azmi Erdoğan

Boriding is often used to improve the wear resistance of metals and alloys and successful results are obtained. Although boriding increases the wear resistance in HEAs, it is also important to know the oxidation behavior, especially for high temperature applications. In order to determine the cyclic oxidation behavior of boriding in HEAs, alloy CrFeMnNbNi was subjected to boriding in this study. In the CrFeMnNbNi alloy that was produced by arc melting, three phases were detected as FeNi, FeCr and Laves in the post-production analysis. With the pack boriding process, a boride zone of approximately 30–35 μm thickness and a diffusion zone of 28–33 μm consisting of different types of borides (M_xB_y) were obtained on the surface. Both HEA and borided-HEA were exposed to cyclic oxidation experiments up to 45 h at 900 °C. Mn, which has a high affinity to oxygen, caused the formation of oxides containing predominantly Mn. The presence of boride phases in the subsurface regions changed the formed oxide products. In the borided sample, oxide formations containing Mn-Fe-B were detected and showed rapid oxide growth. The oxide growth caused serious damage in some areas, weakening the oxidation resistance.

硼化通常用于提高金属和合金的耐磨性，并取得了成功的结果。虽然硼化可以提高 HEA 的耐磨性，但了解其氧化行为也很重要，尤其是在高温应用中。为了确定硼化在 HEA 中的循环氧化行为，本研究对 CrFeMnNbNi 合金进行了硼化。在通过电弧熔化生产的 CrFeMnNbNi 合金中，在生产后分析中检测到三相：FeNi、FeCr 和 Laves。通过包硼工艺，在表面获得了约 30-35 μm 厚的硼化物区和 28-33 μm 的扩散区，这些扩散区由不同类型的硼化物（MxBy）组成。HEA 和硼化物-HEA 都在 900 °C 下进行了长达 45 小时的循环氧化实验。锰与氧的亲和力很高，会形成主要含锰的氧化物。次表层区域硼化物相的存在改变了形成的氧化物产物。在硼化物样品中，检测到含有 Mn-Fe-B 的氧化物形成，并显示出氧化物的快速增长。氧化物的生长在某些区域造成了严重破坏，削弱了抗氧化性。

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引用次数: 0

Strategically designed bioactive dual-layer coating of octacalcium phosphate and dicalcium phosphate dihydrate for enhancement of the corrosion resistance of pure magnesium for orthopaedic applications 战略性设计的生物活性磷酸八钙和磷酸二钙二水双层涂层，用于增强骨科应用中纯镁的耐腐蚀性能

IF 5.3 2区材料科学 Q1 MATERIALS SCIENCE, COATINGS & FILMS

Surface & Coatings Technology

Pub Date : 2024-11-15 DOI: 10.1016/j.surfcoat.2024.131556

Tina Sadat Hashemi , Satish Jaiswal , Mert Celikin , Helen O. McCarthy , Tanya J. Levingstone , Nicholas J. Dunne

The application of biodegradable implants manufactured from magnesium (Mg) has gained traction in clinical applications despite concerns about their corrosion behaviour hindering widespread acceptance. This study aims to advance the field by focussing on developing calcium phosphate (CaP) coatings on pure Mg, with the overall objective of modulating the corrosion rate of Mg-based orthopaedic implants to facilitate effective bone remodelling. In this work, different configurations of bioactive CaP-based coatings, including dicalcium phosphate dehydrate (DCPD), octacalcium phosphate (OCP), and dual-layer DCPD-OCP coatings, were applied to control the corrosion behaviour of Mg. XRD and SEM results confirmed the formation of hydroxyapatite (HA) after 14 days of immersion in Hank's solution. The adhesion force results demonstrated that the DCPD coating provided a higher adhesion force than the OCP coating, indicating its potential to enhance the interface stability between the implant and tissue. The results from the potentiodynamic polarisation tests demonstrated a five-fold reduction in corrosion rate for DCPD-OCP-coated Mg compared to uncoated Mg. The incorporation of dual-layer CaP coatings leverages the synergistic advantages of each constituent, enhancing coating adhesion via the compact structure of the DCPD base layer and providing a hydrophilic surface (contact angle ≤15°) via the OCP layer. This dual-layer architecture results in superior corrosion resistance for Mg-based orthopaedic implants, thereby potentially addressing a critical bottleneck in their clinical application.

由镁（Mg）制造的可生物降解植入体在临床应用中已获得了越来越多的关注，尽管人们对其腐蚀行为的担忧阻碍了其被广泛接受。本研究旨在推动这一领域的发展，重点是在纯镁上开发磷酸钙（CaP）涂层，总体目标是调节镁基骨科植入物的腐蚀速率，以促进有效的骨重塑。在这项工作中，应用了不同结构的生物活性 CaP 涂层，包括脱水磷酸二钙（DCPD）、磷酸八钙（OCP）和双层 DCPD-OCP 涂层，以控制镁的腐蚀行为。XRD 和 SEM 结果表明，在 Hank's 溶液中浸泡 14 天后，羟基磷灰石（HA）形成。粘附力结果表明，DCPD 涂层比 OCP 涂层提供了更高的粘附力，这表明它具有增强植入物与组织之间界面稳定性的潜力。电位极化测试结果表明，与未涂层镁相比，DCPD-OCP 涂层镁的腐蚀率降低了五倍。双层 CaP 涂层充分利用了每种成分的协同优势，通过 DCPD 底层的紧凑结构增强了涂层附着力，并通过 OCP 层提供了亲水性表面（接触角 ≤15°）。这种双层结构为镁基骨科植入物带来了卓越的耐腐蚀性，从而有可能解决其临床应用中的一个关键瓶颈。

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引用次数: 0

Systematic investigations on the microstructural evolution and degradation mechanism of Cr3Si-coated Zry-4 under DBA and BDBA conditions DBA 和 BDBA 条件下 Cr3Si 涂层 Zry-4 的微结构演变和降解机理的系统研究

IF 5.3 2区材料科学 Q1 MATERIALS SCIENCE, COATINGS & FILMS

Surface & Coatings Technology

Pub Date : 2024-11-15 DOI: 10.1016/j.surfcoat.2024.131549

Haiyan Liao , Haibo Ruan , Weijiu Huang , Jin Hu , Xiangkong Xu , Xiaohan Deng , Junjun Wang , Yongyao Su

Cr₃Si and Cr coatings were deposited on Zry-4 substrates via magnetron sputtering to examine their oxidation behavior in steam ranging from 1200 to 1400 °C. At 1200 °C, a dense Cr₂O₃ layer that formed on the surface of the Cr₃Si-coated Zry-4 followed a power-law function, preventing the internal diffusion of O. Additionally, an in-situ Zr₂Si layer, developed between the Cr₃Si coating and Zry-4 substrate, significantly mitigated the outward diffusion of Zr. However, at 1330 °C in steam, the continuity of the Zr₂Si layer was disrupted due to the formation of ZrCr₂, which facilitated the outward diffusion of Zr to the interface between the remaining Cr₃Si layer and the outer Cr₂O₃ layer. Despite the reduction in the Cr₂O₃ layer thickness caused by redox reactions between Cr₂O₃ and Zr, the Cr₃Si coating still managed to delay the steam oxidation of the Zry-4 substrate for over 60 min at 1330 °C. While on the uncoated side, the thickness of the formed ZrO₂ reached 846 ± 5.2 μm. For the Cr coating, after 30 min of oxidation in steam at 1330 °C, a significant liquid eutectic formed between the Cr coating and the Zry-4 substrate, compromising the coating's overall structural stability. The oxidation resistance of the Cr₃Si coating surpasses that of the Cr coating after exposure to steam at 1400 °C for 10 min. These findings suggest that the Cr₃Si coatings hold promise for robustly protecting zirconium alloy cladding in scenarios involving design basis accidents (DBA) and beyond design basis accidents (BDBA).

通过磁控溅射在 Zry-4 基底上沉积了 Cr3Si 和 Cr 涂层，以研究它们在 1200 至 1400 °C 蒸汽中的氧化行为。1200 °C时，Cr3Si涂层Zry-4表面形成的致密Cr2O3层遵循幂律函数，阻止了O的内部扩散。然而，在 1330 °C 的蒸汽中，由于形成了 ZrCr2，Zr2Si 层的连续性被破坏，从而促进了 Zr 向剩余 Cr3Si 层和外部 Cr2O3 层之间的界面向外扩散。尽管 Cr2O3 和 Zr 之间的氧化还原反应导致了 Cr2O3 层厚度的减少，但 Cr3Si 涂层仍成功地将 Zry-4 基底在 1330 °C 下的蒸汽氧化延迟了 60 分钟以上。在未涂层的一侧，形成的 ZrO2 厚度达到 846 ± 5.2 μm。就铬涂层而言，在 1330 ℃ 的蒸汽中氧化 30 分钟后，铬涂层和 Zry-4 基底之间形成了明显的液态共晶，影响了涂层的整体结构稳定性。在 1400 °C 的蒸汽中暴露 10 分钟后，Cr3Si 涂层的抗氧化性超过了 Cr 涂层。这些研究结果表明，Cr3Si 涂层有望在涉及设计基准事故 (DBA) 和超出设计基准事故 (BDBA) 的情况下为锆合金包层提供强有力的保护。

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引用次数: 0

Fabrication and corrosion performance evaluation of LDHs@ZIF-67 composite coatings based on magnesium alloys AZ31 基于镁合金 AZ31 的 LDHs@ZIF-67 复合涂层的制造和腐蚀性能评估

IF 5.3 2区材料科学 Q1 MATERIALS SCIENCE, COATINGS & FILMS

Surface & Coatings Technology

Pub Date : 2024-11-14 DOI: 10.1016/j.surfcoat.2024.131551

Yonghua Chen , Zhenzhen Tian , Fubing Yu , Mingyi Wu , Wenhui Yao , Yuantai He , Yuan Yuan , Zhihui Xie , Guozhi Wu , Jiahao Wu , Fusheng Pan , Liang Wu

The widespread application of magnesium (Mg) and Mg alloys is limited by their poor corrosion resistance. The anti-corrosion performance of micro-arc oxidation (MAO) is not ideal enough. Therefore, this study fabricated various LDHs@ZIF-67 composite coatings on MAO-coated Mg alloy. The surface and interface structure, composition, corrosion stability and mechanism of the LDHs@ZIF-67 composite coatings were investigated. The results suggested that the MgCo LDHs@ZIF-67 coating represented the lowest corrosion current density (i_corr = 2.51 × 10⁻⁸ A/cm²), the lowest corrosion rate (hydrogen evolution volume = 3.21 mL·cm⁻²) and the best corrosion resistance. The stable existence of LDHs and ZIF-67 structures synergistically integrated to produce a denser composite coating, enhancing the corrosion resistance of AZ31, and surpassing the limitations of individual materials in providing long-term corrosion protection. Such composite coatings are poised to offer efficacious solutions to prevalent metal corrosion issues.

由于镁（Mg）和镁合金的耐腐蚀性较差，其广泛应用受到了限制。微弧氧化（MAO）的防腐性能不够理想。因此，本研究在 MAO 涂层镁合金上制备了各种 LDHs@ZIF-67 复合涂层。研究了 LDHs@ZIF-67 复合涂层的表面和界面结构、成分、腐蚀稳定性和机理。结果表明，镁钴 LDHs@ZIF-67 涂层具有最低的腐蚀电流密度（icorr = 2.51 × 10-8 A/cm2）、最低的腐蚀速率（氢演化体积 = 3.21 mL-cm-2）和最佳的耐腐蚀性。LDHs 和 ZIF-67 结构的稳定存在协同产生了更致密的复合涂层，增强了 AZ31 的耐腐蚀性，在提供长期腐蚀保护方面超越了单种材料的局限性。这种复合涂层有望为普遍存在的金属腐蚀问题提供有效的解决方案。

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引用次数: 0