Surface & Coatings Technology最新文献_第6页

Microstructure modulation strategy for the continuous uniform growth of quasi-columnar crystalline structure coatings based on high deposition rate powder 基于高沉积速率粉末的准柱状晶体结构涂层连续均匀生长的微结构调控策略

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

Surface & Coatings Technology

Pub Date : 2024-10-30 DOI: 10.1016/j.surfcoat.2024.131535

Qing He, Jia-jun Wang, Yu-sheng Zhang, Xin-hui Li, Xiao-ming You, Shi-xing Wang, Li-kang Liang

Plasma spray-physical vapor deposition (PS-PVD) allows the preparation of quasi-columnar coatings with columnar crystalline branching and dendritic structures, resulting in long life and high-thermal insulation properties. However, the microstructural feature of the coating is also responsible for the significant difference in hardness and elastic modulus in the coating's growth direction, which has an impact on its resistance to thermal shock and high-temperature erosion. This study summarizes the influence of motion parameters on the coating microstructure by adjusting the relative motion parameters between the spray gun and the sample, and proposes a deposition modulation strategy for a quasi-columnar structure coating that can be continuously and uniformly grown by increasing the powder feeding gradient. The increase of relative motion velocity reduces the growth interruption caused by the re-nucleation on the surface of columnar crystals, and the liquid phase and nanoclusters increase after the gas phase concentration is gradually increased to saturation with the increase of powder delivered. The gas-phase diffusion growth mode can be maintained continuously because the jet has sufficient energy to maintain the substrate temperature at low powder feed rates. The preparation of coatings with uniform columnar crystal microstructure and mechanical properties was realized, while the thermal cycle life of NiCrAlYSi/8YSZ thermal barrier coatings at 1100 °C was significantly improved, up to 1350 h–1650 h, and the high-temperature erosion rate was significantly reduced relative to the atmospheric plasma spraying (APS) coatings, which was improved to a certain extent.

等离子喷涂-物理气相沉积（PS-PVD）可以制备具有柱状结晶分支和树枝状结构的准柱状涂层，从而获得长寿命和高隔热性能。然而，涂层的微观结构特征也是导致涂层在生长方向上的硬度和弹性模量存在显著差异的原因，这对涂层的抗热震性和抗高温侵蚀性产生了影响。本研究通过调整喷枪与试样之间的相对运动参数，总结了运动参数对涂层微观结构的影响，并提出了一种沉积调控策略，即通过增大送粉梯度，实现准柱状结构涂层的连续均匀生长。相对运动速度的增加减少了柱状晶体表面再成核引起的生长中断，随着粉末输送量的增加，气相浓度逐渐增加到饱和后，液相和纳米团簇也随之增加。气相扩散生长模式可以持续保持，因为喷流具有足够的能量，可以在较低的粉末进料速率下保持基底温度。实现了制备具有均匀柱状晶体微观结构和机械性能的涂层，同时显著提高了 NiCrAlYSi/8YSZ 热障涂层在 1100 ℃ 下的热循环寿命，可达 1350 h-1650 h，高温侵蚀率相对于大气等离子喷涂（APS）涂层显著降低，得到了一定程度的改善。

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引用次数: 0

Combinatorial synthesis of AlNi alloys by low-pressure cold spray deposition and post-laser alloying process 通过低压冷喷沉积和激光后合金化工艺组合合成铝镍合金

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

Surface & Coatings Technology

Pub Date : 2024-10-30 DOI: 10.1016/j.surfcoat.2024.131542

Tanguy Lacondemine , Beatriz Puga , Rémy Kalmar , Manuel Fendler , Fanny Balbaud

Aluminum-Nickel (AlNi) alloys are of great interest due to their exceptional high-temperature wear and corrosion resistance, making them valuable in transport, energy, and materials processing applications. However, challenges in the production and shaping of these alloys, particularly as thick coatings, remain significant. This study introduces an innovative method for the high-throughput synthesis of AlNi coatings, utilizing a two-step process: low-pressure cold spray deposition followed by laser surface alloying. The combination of these two techniques not only improves the synthesis process but also opens avenues for exploring new material compositions with specific application requirements. This approach holds significant potential for accelerating the development and optimization of advanced coatings and multiphase compounds in applications such as repair and additive manufacturing.

Aluminum and nickel powders were co-sprayed to create coatings with controlled compositions ranging from 50Al50Ni to 10Al90Ni (wt%). Subsequent laser treatment induced in-situ alloying and homogenization, resulting in dense, uniform AlNi coatings. The microstructure and chemical composition were characterized using Scanning Electron Microscopy (SEM) and Energy Dispersive X-ray Spectroscopy (EDS), while X-ray Diffraction (XRD) identified the formation of various phases, including Al₃Ni and AlNi₃ phases. The process demonstrated effective alloying and microstructural homogeneity, with residual alumina present at the surface. Despite the presence of some microstructural defects, such as cracking, this method provides a robust foundation for further refinement and opens new possibilities for tailoring alloy properties through combinatorial cold spray and laser alloying techniques.

铝镍（AlNi）合金因其优异的高温耐磨性和耐腐蚀性而备受关注，在运输、能源和材料加工等应用领域具有重要价值。然而，这些合金的生产和成型，尤其是厚涂层的生产和成型，仍然面临着巨大的挑战。本研究介绍了一种高通量合成铝镍涂层的创新方法，该方法采用两步工艺：低压冷喷沉积，然后进行激光表面合金化。这两种技术的结合不仅改进了合成工艺，还为探索具有特定应用要求的新材料成分开辟了途径。铝粉和镍粉被共同喷涂成涂层，可控成分从 50Al50Ni 到 10Al90Ni（重量百分比）不等。随后的激光处理诱导了原位合金化和均匀化，产生了致密、均匀的铝镍涂层。使用扫描电子显微镜（SEM）和能量色散 X 射线光谱（EDS）对微观结构和化学成分进行了表征，而 X 射线衍射（XRD）则确定了各种相的形成，包括 Al3Ni 和 AlNi3 相。该工艺显示了有效的合金化和微观结构的均匀性，表面存在残余氧化铝。尽管存在裂纹等微观结构缺陷，但这种方法为进一步完善提供了坚实的基础，并为通过组合冷喷和激光合金化技术定制合金特性提供了新的可能性。

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引用次数: 0

Fabrication of Ti3CN quasi-MXene based poly glycidyl methacrylate and poly (3,4-ethylene dioxythiophene): Poly (styrene sulfonate) conducting polymer coated materials for photocatalytic eradicator of organic pollutants 基于聚缩水甘油甲基丙烯酸酯和聚（3,4-乙烯二氧噻吩）制备 Ti3CN 准 MXene：聚（苯乙烯磺酸）导电聚合物涂层材料，用于光催化消除有机污染物

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

Surface & Coatings Technology

Pub Date : 2024-10-30 DOI: 10.1016/j.surfcoat.2024.131480

Umuhoza Claudine , Pengfei Zhang , Saleem Raza, Junsheng Ye, Ming Liu, Ye Cheng, Tariq Bashir, Asif Hayat, Ehsan Ghasali, Yasin Orooji

MXene, a two-dimensional (2D) transition metal carbide or nitride, has gained significant attention due to its exceptional properties and wide-ranging applications. MXenes exhibit distinctive physical and chemical characteristics, making them suitable for electrocatalysis, supercapacitors, semiconductors, batteries, sensors, biomedicine, water splitting, and photocatalysis. In environmental photocatalysis, efforts have been made to improve conductivity, structural stability, and morphology. This study synthesized a photocatalyst by coating or doping a conducting polymer onto a quasi-MXene (Ti₃CN) substrate. Initially, Ti₃AlCN was exfoliated using HF to form 2D Ti₃CN quasi-MXene, which was then doped with GMA and PEDOT: PSS conducting polymers for photocatalytic dye degradation. The broad heterogeneous interfaces in this network significantly enhance photocatalytic performance and pollutant removal capacity. The Ti₃CN@GMA/PEDOT: PSS photocatalyst was characterized through SEM, FTIR, XPS, XRD, BET, and EDX techniques and tested for the degradation of various pollutants in wastewater under visible light. The degradation rates achieved were 94.1 % for Rose Bengal, 91.6 % for Rhodamine B, and 90.6 % for Methylene Blue, with corresponding rate constants of 0.0366 min⁻¹, 0.0400 min⁻¹, and 0.0388 min⁻¹ over 60 min. The photocatalyst demonstrated excellent performance, highlighting several advantages, including low energy consumption, cost-effectiveness, non-toxic properties, and environmental compatibility, making it a promising solution for wastewater treatment applications.

MXene 是一种二维（2D）过渡金属碳化物或氮化物，因其卓越的性能和广泛的应用而备受关注。MXene 具有独特的物理和化学特性，因此适用于电催化、超级电容器、半导体、电池、传感器、生物医学、水分离和光催化。在环境光催化方面，人们一直在努力提高导电性、结构稳定性和形态。本研究通过在准甲苯（Ti3CN）基底上涂覆或掺杂导电聚合物，合成了一种光催化剂。首先用高频剥离 Ti3AlCN，形成二维 Ti3CN 准 MXene，然后掺杂 GMA 和 PEDOT：PSS 导电聚合物，用于光催化染料降解。该网络中的宽异质界面显著提高了光催化性能和污染物去除能力。对 Ti3CN@GMA/PEDOT：PSS 光催化剂进行了表征，采用了 SEM、FTIR、XPS、XRD、BET 和 EDX 技术，并在可见光下进行了废水中各种污染物的降解测试。在 60 分钟内，玫瑰红的降解率为 94.1%，罗丹明 B 的降解率为 91.6%，亚甲蓝的降解率为 90.6%，相应的速率常数分别为 0.0366 min-1、0.0400 min-1 和 0.0388 min-1。该光催化剂性能卓越，具有能耗低、成本效益高、无毒和环境相容性好等优点，是一种前景广阔的废水处理解决方案。

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引用次数: 0

Enhancing hot corrosion resistance of N-doping NiCoCr-based superalloy coatings fabricated by directed energy deposition in mixed molten salts 在混合熔盐中通过定向能沉积提高掺杂 N 的镍钴铬基超合金涂层的耐热腐蚀性能

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

Surface & Coatings Technology

Pub Date : 2024-10-30 DOI: 10.1016/j.surfcoat.2024.131501

Shuai Wang , Ruoyu Li , Jijin Xu , Yuan Yong , Xiaohong Sun , Hongfei Yin , Chun Yu

Here, a NiCoCr-based superalloy coating has been developed in ultra-supercritical environments. However, optimizing the coating composition to enhance the anti-corrosion performance remains a formidable challenge. This research introduced an innovative N-doping strategy to enhance the hot corrosion resistance of the coating by utilizing directed energy deposition. The hot corrosion behavior at 700 °C of the coating with N-doping reinforcement was investigated. Detailed characterizations of the microstructural evolution and corrosion products were conducted. The results showed that the improvement of hot corrosion resistance was attributed to the continuous protective film retained in the N-doping reinforced coating, which inhibited the inward diffusion of corrosive media to retard the chlorination and sulfuration reaction. This work provides new insight into the design of corrosion-resistant superalloys and highlights the potential of N-doping superalloy coating in extreme environments.

在此，我们开发了一种在超超临界环境中使用的镍钴铬基超合金涂层。然而，优化涂层成分以提高抗腐蚀性能仍然是一项艰巨的挑战。本研究引入了一种创新的 N 掺杂策略，通过利用定向能沉积来增强涂层的耐热腐蚀性能。研究了掺杂 N 增强成分的涂层在 700 °C 下的热腐蚀行为。对微观结构演变和腐蚀产物进行了详细表征。结果表明，耐热腐蚀性能的提高归功于 N 掺杂增强涂层中保留的连续保护膜，它抑制了腐蚀介质的向内扩散，从而延缓了氯化和硫化反应。这项研究为耐腐蚀超耐热合金的设计提供了新的见解，并凸显了 N 掺杂超耐热合金涂层在极端环境中的应用潜力。

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引用次数: 0

Impact of sulfate to chloride ratio on titanium aluminide coating's high temperature corrosion performance in settings mimicking waste incineration 硫酸盐与氯化物比率对铝化钛涂层在模拟垃圾焚烧环境中高温腐蚀性能的影响

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

Surface & Coatings Technology

Pub Date : 2024-10-30 DOI: 10.1016/j.surfcoat.2024.131463

Duoli Wu , Liao Xiang , Jiayin Zheng , Yi Li , Weizhou Li , Chao Zhang

One major problem with waste incineration is the corrosion of superheater tubes at high temperatures. The presence of sulfate and chloride in this setting poses a severe risk to the boiler's service life. In this work, pack aluminizing was used to prepare titanium aluminide coatings, which was then subjected to five distinct NaCl+Na₂SO₄ salt combination proportions for 168 h at 600 °C. The outcomes demonstrated that in the presence of solid Na₂SO₄ deposits, titanium aluminide coatings displayed remarkably low corrosion rates. Adding 1/6 NaCl significantly accelerated the rate of corrosion. The electrochemical corrosion resulting from eutectization between NaCl and Na₂SO₄ was again considerably amplified when the NaCl level was raised to 1/4.

垃圾焚烧的一个主要问题是过热器管道在高温下的腐蚀。在这种情况下，硫酸盐和氯化物的存在对锅炉的使用寿命构成严重威胁。在这项工作中，采用了包铝法制备铝化钛涂层，然后在 600 °C 下将其置于五种不同比例的 NaCl+Na2SO4 盐组合中 168 小时。结果表明，在存在固体 Na2SO4 沉积物的情况下，铝化钛涂层的腐蚀率极低。加入 1/6 NaCl 会明显加快腐蚀速度。当 NaCl 水平提高到 1/4时，NaCl 和 Na2SO4 之间共晶产生的电化学腐蚀再次显著加剧。

引用次数: 0

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

Surface & Coatings Technology

Pub Date : 2024-10-30 DOI: 10.1016/j.surfcoat.2024.131418

Zihou Li , Chao Wang , Wenjing Fu , Hailin Nie , Wenxi Wang , Jun Luo

The laser melt deposition process often involves fabricating custom alloys from cost-effective elemental powder blends. However, discrepancies between the nominal ratio of the pre-mixed powders and the final composition of the deposited part are commonly observed due to variations in the material properties of the elemental powders. In this study, separate experiments were employed to investigate the relationship of deposition characteristics between individual elemental powders and elemental powder blends in the laser melt deposition process. To investigate the spatial distribution between elemental powder particles, powder flow characteristics in four different delivery systems were measured. Single-track deposition experiments were deployed to study the real powder catchment efficiency of elemental powder and the final composition of the deposited layer. In addition, a finite element model was established and validated with experimental data to predict the dilution rate and final chemical composition of the deposited layer. The experimental results indicate a strong correlation between the powder catchment efficiency of individual elemental powder and the final composition of the deposited layer. The simulation results agreed well with the actual composition of the deposited track. This study’s findings have the potential to predict and optimize the composition of the desired materials fabricated by elemental powder blends in the laser melt deposition process.

激光熔融沉积工艺通常涉及利用具有成本效益的元素粉末混合物制造定制合金。然而，由于元素粉末的材料特性不同，通常会发现预混合粉末的标称比例与沉积部件的最终成分之间存在差异。本研究采用了不同的实验来研究激光熔融沉积过程中单个元素粉末和元素粉末混合物之间沉积特性的关系。为了研究元素粉末颗粒之间的空间分布，测量了四种不同输送系统中的粉末流动特性。通过单轨沉积实验研究了元素粉末的实际粉末捕集效率和沉积层的最终成分。此外，还建立了一个有限元模型，并通过实验数据进行验证，以预测沉积层的稀释率和最终化学成分。实验结果表明，单个元素粉末的捕粉效率与沉积层的最终成分之间存在很强的相关性。模拟结果与沉积轨道的实际成分十分吻合。这项研究的结果有望预测和优化在激光熔融沉积过程中通过元素粉末混合物制造的所需材料的成分。

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引用次数: 0

Steam oxidation of thermally deposited coatings from 304 L and recycled 316 L/Z100 steels: Influence of temperature, coatings microstructure and steel recycling 304 L 和回收的 316 L/Z100 钢热沉积涂层的蒸汽氧化：温度、涂层微观结构和钢回收的影响

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

Surface & Coatings Technology

Pub Date : 2024-10-30 DOI: 10.1016/j.surfcoat.2024.131478

Filip Kateusz , Adelajda Polkowska , Karolina Chat-Wilk , Konrad Chrzan , Daria Serafin , Szymon Pawlik , Tomasz Dudziak , Jerzy Jedliński

The application of thermally sprayed stainless steels coatings is a well-established approach to protecting low-alloy steels against high-temperature degradation. In this study, we investigated both: (1) the influence of microstructural features of the coatings and (2) the recycling of stainless steels on the course of high temperature steam oxidation. It was achieved by thermally spraying coatings on C45 steel from 304 L and a new type of 316 L/Z100 steel, obtained as a result of mixed scraps recycling. Steam oxidation tests carried out in the temperature range 600–800 °C for 500 h in pure steam show temperature depended mechanism of oxidation, which was defined and described. The formation of the scales with a multi-layered structure was observed, consisting of Fe₂O₃, Fe₃O_4, Cr₂O₃, Fe- or Cr-rich Cr_xFe_x-2O₃ and (Mn,Cr,Ni)_xFe_3-xO₄ spinels. The relative ratio of the phases and their presence in particular scale layers varied depending on the material studied and the exposure temperature. The key findings are that recycling of steel deposited as protective coating has led to an unintended change in Si and C concentrations, which may affects course of oxidation. Also, the microstructure of the initial coatings, consisting of porosity and a significant volume of oxides formed during steel deposition, inhibits the formation of a homogeneous layer of protective Cr₂O₃. As a result, the established values of oxidation kinetics constants (in range of 8.55E-12 to 1.50E-10 g³·cm⁻⁶·s⁻¹ for 316 L/Z100 and 2,71E-12 to 4.60E-10 g³·cm⁻⁶·s⁻¹ for 304 L coatings) and oxidation activation energies (156.4 kJ·mol⁻¹ for 316 L/Z100 and 211.5 kJ·mol⁻¹ for 304 L coatings) differ significantly from those of bulk steels under the same conditions reported in the literature.

应用热喷涂不锈钢涂层是防止低合金钢高温降解的一种行之有效的方法。在这项研究中，我们对以下两个方面进行了研究：(1) 涂层微观结构特征的影响；(2) 不锈钢的回收利用对高温蒸汽氧化过程的影响。我们在 304 L 的 C45 钢和一种新型 316 L/Z100 钢上热喷涂了涂层，这种钢是混合废料回收的结果。在 600-800 °C 的温度范围内，在纯蒸汽中进行了 500 小时的蒸汽氧化试验，结果表明，氧化机制与温度有关。观察到形成了具有多层结构的鳞片，由 Fe2O3、Fe3O4、Cr2O3、富含 Fe 或 Cr 的 CrxFex-2O3 和 (Mn,Cr,Ni)xFe3-xO4 尖晶石组成。这些相的相对比例及其在特定鳞片层中的存在随研究材料和暴露温度的不同而变化。研究的主要发现是，作为保护层沉积的钢的回收利用导致了硅和碳浓度的意外变化，这可能会影响氧化过程。此外，初始涂层的微观结构包括多孔性和在钢沉积过程中形成的大量氧化物，这阻碍了均匀的 Cr2O3 保护层的形成。因此，氧化动力学常数（316 L/Z100 为 8.55E-12 至 1.50E-10 g3-cm-6-s-1，304 L 涂层为 2,71E-12 至 4.60E-10 g3-cm-6-s-1）和氧化活化能（316 L/Z100 为 156.4 kJ-mol-1，304 L 涂层为 211.5 kJ-mol-1）的既定值与文献报道的相同条件下的块状钢的氧化动力学常数和氧化活化能有很大不同。

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引用次数: 0

Minimum Energy Atomic Deposition: A novel, efficient atomistic simulation method for thin film growth 最小能量原子沉积：用于薄膜生长的新型高效原子模拟方法

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

Surface & Coatings Technology

Pub Date : 2024-10-30 DOI: 10.1016/j.surfcoat.2024.131462

Shivraj Karewar , Germain Clavier , Marc G.D. Geers , Olaf van der Sluis , Johan P.M. Hoefnagels

Thin-film growth is an area of research concerned with complex phenomena happening at atomic scales. Therefore, molecular simulation has been an important tool to confront experimental results to theoretical assumptions. However, the traditional thin film growth simulation methods, i.e., Molecular Dynamics (MD) and kinetic Monte-Carlo (kMC) and combinations thereof, suffer from limitations inherent to their design, i.e., limitations in system size and simulation time for MD and predetermined reaction rates and reaction sites for kMC. Consequently, it is practically impossible to simulate the evolution of polycrystalline growth resulting in

\sim

100 nm thick films with realistic stress fields and defect structures, such as grain boundaries, stacking faults, etc. In this work, we propose a versatile and efficient atomistic simulation method (Minimum Energy Atomic Deposition) which works by direct insertion of atoms at points of minimal potential energy through efficient scanning of candidate positions and rapid relaxation of the system. This method allows simulating

\geq

100 nm film thickness while mimicking experimental growth rates and high crystallinity and low-defect concentration and enables in-depth studies of atomic growth mechanisms, the evolution of crystal defects, and residual stress build-up. We demonstrate the efficiency and versatility of the method through the deposition of Al on Si, Al on Al, and Si on Si. The simulation results are systematically compared with experimental observations of thin-film deposition, yielding consistent observations. The method has been implemented in open-source LAMMPS software, making it easily accessible to the research community.

薄膜生长是一个涉及原子尺度复杂现象的研究领域。因此，分子模拟一直是将实验结果与理论假设对立起来的重要工具。然而，传统的薄膜生长模拟方法，即分子动力学（MD）和动力学蒙特卡洛（kMC）及其组合，受到其设计本身的限制，即分子动力学受系统规模和模拟时间的限制，动力学蒙特卡洛受预定反应速率和反应点的限制。因此，实际上不可能模拟出具有真实应力场和缺陷结构（如晶界、堆叠断层等）的厚度在 100 nm 以下薄膜的多晶生长演变过程。在这项工作中，我们提出了一种多功能、高效的原子模拟方法（最小能量原子沉积），通过有效扫描候选位置和系统的快速弛豫，在最小势能点直接插入原子。这种方法可以模拟≥100 nm 的薄膜厚度，同时模拟实验中的生长速率、高结晶度和低缺陷浓度，并能深入研究原子生长机制、晶体缺陷的演变和残余应力的积累。我们通过在硅上沉积铝、在铝上沉积铝以及在硅上沉积硅，证明了该方法的高效性和多功能性。模拟结果与薄膜沉积的实验观察结果进行了系统比较，结果一致。该方法已在开源的 LAMMPS 软件中实现，使研究界可以轻松使用。

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引用次数: 0

Preparation and tribological performance of Ni-SiC composite coating on 304 stainless steel through brush plating 通过刷镀制备 304 不锈钢上的 Ni-SiC 复合涂层及其摩擦学性能

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

Surface & Coatings Technology

Pub Date : 2024-10-30 DOI: 10.1016/j.surfcoat.2024.131491

Xuanle Chen , Nan Jiang , Yu Zhan , Yudong Luo , Nan Ye , Jiancheng Tang , Haiou Zhuo

The low hardness of 304 stainless steels makes them susceptible to wear, which increasing the probability of workpiece failure during actual use. In this study, a Ni-SiC composite coating was successfully prepared on 304 stainless steel using brush plating equipment, effectively enhancing the material's surface wear resistance. By characterizing the microstructure and properties of the composite plating layer, we determined the optimal process parameters for brushing Ni-SiC wear-resistant plating and revealed the wear mechanism of this protective layer. When the parameters for preparing the composite plating coating were adjusted to a voltage of 10 V, a relative motion rate of 8 m/min, a plating solution temperature of 50 °C and a SiC concentration of 15 g/L, the resulting wear-resistant plating coating exhibited an impressive microhardness value of 457 HV_0.1 and a friction coefficient of 0.46. It was observed that the fatigue wear mechanism dominated in Ni-SiC composite coatings with a solution SiC concentration below 5 g/L, while oxidative and abrasive wear mechanisms were dominant in Ni-SiC composite coatings with solution SiC concentrations exceeding 10 g/L.

304 不锈钢的硬度较低，容易磨损，这增加了工件在实际使用过程中出现故障的概率。本研究利用电刷镀设备在 304 不锈钢上成功制备了 Ni-SiC 复合镀层，有效提高了材料的表面耐磨性。通过表征复合镀层的微观结构和性能，我们确定了刷镀 Ni-SiC 耐磨镀层的最佳工艺参数，并揭示了该保护层的磨损机理。将制备复合镀层的参数调整为电压 10 V、相对运动速率 8 m/min、镀液温度 50 °C、SiC 浓度 15 g/L，得到的耐磨镀层的显微硬度值为 457 HV0.1，摩擦系数为 0.46。据观察，在 SiC 溶液浓度低于 5 g/L 的 Ni-SiC 复合镀层中，疲劳磨损机制占主导地位，而在 SiC 溶液浓度超过 10 g/L 的 Ni-SiC 复合镀层中，氧化磨损和磨料磨损机制占主导地位。

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引用次数: 0

Study on corrosion resistance of galvanised steel passivated by a silanised cerium-tannic acid solution 硅烷化铈-单宁酸溶液钝化镀锌钢的耐腐蚀性研究

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

Surface & Coatings Technology

Pub Date : 2024-10-30 DOI: 10.1016/j.surfcoat.2024.131483

Tianyuan Zhang , Juan Wang , Jian Shen , Xiujuan Wang , Xianjie Fan , Zhuhan Liu , Mengting Bao , Bingtang Wang , Yi Feng

In this study, a silanised cerium-tannic acid (Ce-TA) passivation solution was developed, and the effects of solution composition and passivation time on the corrosion resistance of galvanised steel were investigated. SEM-EDS, AFM, FTIR, and Raman spectroscopy were used to characterise the silanised Ce-TA-passivated samples. When the concentrations of both cerium nitrate and tannic acid in the passivation solution were 1.5 g/L, and the passivation duration was 45 s, the surface integrity and composition homogeneity of the passivated sample were good. Electrochemical measurements revealed that the |Z|_0.01Hz and R_t values of the silanised Ce-TA-passivated samples first increased and then decreased with increasing passivation time. These values also first increased and then decreased with the increase in the amount of Ce-TA. The corrosion resistance efficiencies of the passivated samples exceeded 97 %. The corrosion resistance mechanism of silanised Ce-TA passivation is also discussed.

本研究开发了硅烷化铈-单宁酸（Ce-TA）钝化溶液，并研究了溶液成分和钝化时间对镀锌钢耐腐蚀性的影响。使用扫描电子显微镜-电子显微镜、原子力显微镜、傅立叶变换红外光谱和拉曼光谱对硅烷化 Ce-TA 钝化样品进行了表征。当钝化溶液中硝酸铈和单宁酸的浓度均为 1.5 克/升、钝化持续时间为 45 秒时，钝化样品的表面完整性和成分均匀性良好。电化学测量结果表明，随着钝化时间的延长，硅烷化 Ce-TA 钝化样品的 |Z|0.01Hz 和 Rt 值先升高后降低。随着 Ce-TA 含量的增加，这些值也是先增大后减小。钝化样品的耐腐蚀效率超过 97%。此外，还讨论了硅烷化 Ce-TA 钝化的耐腐蚀机理。

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引用次数: 0